FastFlow

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{{description>Fastflow tutorial: basic programming concepts and related technologies}}
===== Tutorial =====

The FastFlow tutorial can be dowloaded [[http://calvados.di.unipi.it/storage/tutorial/fftutorial.pdf|here]] (version August 2014). The simple tests and examples contained in the tutorial are available as tgz tarball [[http://calvados.di.unipi.it/storage/tutorial/fftutorial_source_code.tgz | here]].


==== The FastFlow programming model ====

The FastFlow programming model is a //structured parallel programming model//. The framework provides several pre defined, general purpose, customizable and composable parallel patterns (or algorithmic skeletons). Any applications whose parallel structure may be modelled using the provided parallel patterns, used alone or in composition, may be implemented using FastFlow. 


















===== The basic =====

=== Pipeline ===

{{:ffnamespace:ff_pipe2.png?400|}}

Pipelining is one of the simplest parallel pattern where data flows through a series of 
stages (or nodes) and each stage processes the input data in some way producing as output a modified version or new data. We will call the data flows **streams of data** or simply **streams**. A pipeline's stages can operate sequentially or in parallel and may have or not
have an internal state. 

<code c++>
/* this is a 3-stage pipeline example */
#include <ff/pipeline.hpp>
using namespace ff;
typedef long fftask_t;

struct firstStage: ff_node_t<task_t> {
    fftask_t *svc(fftask_t *t) {
	for(long i=0;i<10;++i) ff_send_out(new fftask_t(i));
	return EOS; // End-Of-Stream
    }
};
fftask_t* secondStage(fftask_t *t,ff_node*const node) {
    std::cout << "Hello I'm stage" << node->get_my_id() << "\n";
    return t;
}
struct thirdStage: ff_node_t<task_t> {
    fftask_t *svc(fftask_t *t) {
	std::cout << "stage" << get_my_id() << " received " << *t << "\n";
        delete t;
	return GO_ON;
    }
};
int main() {
    ff_pipe<fftask_t> pipe(new firstStage, secondStage, new thirdStage);
    pipe.cleanup_nodes(); // cleanup at exit
    if (pipe.run_and_wait_end()<0) error("running pipe");
    return 0;
}
</code>

=== Farm ===

{{:ffnamespace:ff_farm2.png?400|}}

The task-farm pattern is a stream parallel paradigm based on the replication of a purely functional computation (let's call the function F). Its parallel semantics ensures that it will process tasks such that the single task latency is close to the time needed to compute the function F sequentially, 
while the throughput (under certain conditions) is close to F/n  where n is the number of parallel agents used to execute the farm (called Workers). The concurrent scheme of a farm is composed of three distinct parts: the Emitter (E), the pool of workers (Ws) and the Collector (C). The emitter gets farm's input tasks and distributes them to workers using a given scheduling strategy (round-robin, auto-scheduling, user-defined). The collector collects tasks from workers and sends them to the farm's output stream.

<code c++>
/* the third stage is transformed in a farm */
#include <ff/farm.hpp>
#include <ff/pipeline.hpp>
...

int main() {
    std::vector<ff_node*> W = {new thirdStage, new thirdStage}; // the farm has 2 workers
    ff_pipe<fftask_t> pipe(new firstStage, secondStage, new ff_farm<>(W));
    pipe.cleanup_nodes();
    if (pipe.run_and_wait_end()<0) error("running pipe");
    return 0;
}
</code>


=== ParallelFor/Map ===
A sequential iterative kernel with independent iterations is also known as a par-
allel loop. Parallel loops may be clearly parallelized by using the map or farm
patterns, but this typically requires a substantial re-factoring of the original
loop code with the possibility to introduce bugs and not preserving sequential equivalence. 
In the FastFlow framework there are a set of data parallel patterns implemented on top of the 
basic FastFlow skeletons to ease the implementation of parallel loops: ParallelFor, ParallelForReduce, ParallelForPipeReduce.

Heare a very basic usage example of the ParallelFor pattern:
<code c++>
#include <ff/parallel_for.hpp>
using namespace ff;
int main() {
    long A[100];
    ParallelFor pf;
    pf.parallel_for(0,100,[&A](const long i) {
      A[i] = i;
    });
    ...
    return 0;
}
</code>


=== Data Dependency Tasks Executor (aka MDF) ===

===== Some valid combinations of pipeline and farm (and feedback) =====

{{:ffnamespace:composition2.png?400|}}


<html>

   <div class="maketitle">
                                                                  

                                                                  

<h2 class="titleHead">Parallel Programming Using FastFlow<br />
(Version August 2014)</h2>
                <div class="author" ><span 
class="cmr-12">Massimo Torquati</span>
<br /><span 
class="cmr-12">Computer Science Department, University of Pisa</span>
<br />               <span 
class="cmr-12">torquati@di.unipi.it</span></div><br />
<div class="date" ></div>
                                                                  

                                                                  
   </div>
<!--l. 37--><p class="noindent" ><span 
class="cmbx-12x-x-207">Summary</span>
                                                                  

                                                                  
   <h2 class="chapterHead"><span class="titlemark">Chapter&#x00A0;1</span><br /><a 
 id="x1-10001"></a>Introduction</h2>
<!--l. 2--><p class="noindent" ><span 
class="cmss-10">FastFlow</span> is an open-source, structured parallel programming framework originally
conceived to support highly efficient stream parallel computation while targeting
shared memory multi-core. Its efficiency comes mainly from the optimised
implementation of the base communication mechanisms and from its layered design.
<span 
class="cmss-10">FastFlow</span> provides the parallel applications programmer with a set of ready-to-use,
parametric algorithmic skeletons modelling the most common parallelism
exploitation patterns. The <span 
class="cmti-10">algorithmic skeletons </span>provided by <span 
class="cmss-10">FastFlow</span> may
be freely nested to model more and more complex parallelism exploitation
patterns.
<!--l. 17--><p class="indent" >   <span 
class="cmss-10">FastFlow</span> is an <span 
class="cmti-10">algorithmic skeleton </span>programming framework developed and
maintained by the parallel computing group at the Departments of Computer Science
of the Universities of Pisa and Torino <span class="cite">[<a 
href="#Xfastflow:web">9</a>]</span>.
<!--l. 22--><p class="indent" >   <hr class="figure"><div class="figure" 
>
                                                                  

                                                                  
<a 
 id="x1-10011"></a>
                                                                  

                                                                  
<div class="center" 
>
<!--l. 23--><p class="noindent" >
<!--l. 79--><p class="noindent" ><span class="framebox-c" 
style="width:34.49em;"><div class="minipage"><span 
class="cmss-8">Algorithmic skeletons were introduced by M. Cole in late 1988 </span><span class="cite"><span 
class="cmss-8">[</span><a 
href="#Xcole-th"><span 
class="cmss-8">12</span></a><span 
class="cmss-8">]</span></span><span 
class="cmss-8">. According to this original</span>
<span 
class="cmss-8">work</span>
     <div class="quote">
     <!--l. 79--><p class="noindent" ><span 
class="cmss-8">The  new  system  presents  the  user  with  a  selection  of  independent</span>
     <span 
class="cmss-8">&#8220;algorithmic  skeletons&#8221;,  each  of  which  describes  the  structure  of  a</span>
     <span 
class="cmss-8">particular style of algorithm, in the way in which higher order functions</span>
     <span 
class="cmss-8">represent general computational frameworks in the context of functional</span>
     <span 
class="cmss-8">programming languages. The user must describe a solution to a problem</span>
     <span 
class="cmss-8">as an instance of the appropriate skeleton.</span></div>
<!--l. 79--><p class="noindent" ><span 
class="cmss-8">Later, in his algorithmic skeleton &#8221;manifesto&#8221; </span><span class="cite"><span 
class="cmss-8">[</span><a 
href="#Xcole:manifesto:02"><span 
class="cmss-8">13</span></a><span 
class="cmss-8">]</span></span> <span 
class="cmss-8">this definition evolved as follows:</span>
     <div class="quote">
     <!--l. 79--><p class="noindent" ><span 
class="cmss-8">many  parallel  algorithms  can  be  characterized  and  classified  by  their</span>
     <span 
class="cmss-8">adherence  to  one  or  more  of  a  number  of  generic  patterns  of</span>
     <span 
class="cmss-8">computation  and  interaction.  For  example,  many  diverse  applications</span>
     <span 
class="cmss-8">share  the  underlying  control  and  data  flow  of  the  pipeline  paradigm.</span>
     <span 
class="cmss-8">Skeletal  programming  proposes  that  such  patterns  be  abstracted  and</span>
     <span 
class="cmss-8">provided as a programmer&#8217;s toolkit, with specifications which transcend</span>
     <span 
class="cmss-8">architectural  variations  but  implementations  which  recognize  these  to</span>
     <span 
class="cmss-8">enhance performance.</span></div>
<!--l. 79--><p class="noindent" ><span 
class="cmss-8">Different research groups started working on the algorithmic skeleton concept and produced</span>
<span 
class="cmss-8">different programming frameworks providing the application programmer with algorithmic</span>
<span 
class="cmss-8">skeletons. The definition of algorithmic skeletons evolved and eventually a widely shared</span>
<span 
class="cmss-8">definition emerged stating that:</span>
     <div class="quote">
     <!--l. 79--><p class="noindent" ><span 
class="cmss-8">An   algorithmic   skeleton   is   a   parametric,   reusable   and   portable</span>
     <span 
class="cmss-8">programming  abstraction  modeling  a  known,  common  and  efficient</span>
     <span 
class="cmss-8">parallelism exploitation pattern.</span></div>
<!--l. 79--><p class="noindent" ><span 
class="cmss-8">Currently various frameworks exist that provide the application programmer with algorithmic</span>
<span 
class="cmss-8">skeletons. Usually, the frameworks provide stream parallel skeletons (pipeline, task farm),</span>
<span 
class="cmss-8">data parallel (map, reduce, scan, stencil, divide&amp;conquer) and control parallel (loop,</span>
<span 
class="cmss-8">if-then-else) skeletons mostly as libraries to be linked with the application business</span>
<span 
class="cmss-8">code. Several programming frameworks are actively maintained, including Muesli</span>
<a 
href="http://www.wi1.uni-muenster.de/pi/forschung/Skeletons/1.79/index.html" class="url" ><span 
class="pcrr7t-x-x-80">http://www.wi1.uni-muenster.de/pi/forschung/Skeletons/1.79/index.html</span></a><span 
class="cmss-8">,</span>
<span 
class="cmss-8">Sketo </span><a 
href="http://sketo.ipl-lab.org/" class="url" ><span 
class="pcrr7t-x-x-80">http://sketo.ipl-lab.org/</span></a><span 
class="cmss-8">, OSL </span><a 
href="http://traclifo.univ-orleans.fr/OSL/" class="url" ><span 
class="pcrr7t-x-x-80">http://traclifo.univ-orleans.fr/OSL/</span></a><span 
class="cmss-8">,</span>
<span 
class="cmss-8">SKEPU </span><a 
href="http://www.ida.liu.se/~chrke/skepu/" class="url" ><span 
class="pcrr7t-x-x-80">http://www.ida.liu.se/</span><span 
class="pcrr7t-x-x-80">~</span><span 
class="pcrr7t-x-x-80">chrke/skepu/</span></a><span 
class="cmss-8">, FastFlow</span>
<a 
href="http://mc-fastflow.sourceforge.net/fastflow" class="url" ><span 
class="pcrr7t-x-x-80">http://mc-fastflow.sourceforge.net/fastflow</span></a><span 
class="cmss-8">, Skandium</span>
<a 
href="https://github.com/mleyton/Skandium" class="url" ><span 
class="pcrr7t-x-x-80">https://github.com/mleyton/Skandium</span></a><span 
class="cmss-8">. A recent survey of algorithmic skeleton</span>
<span 
class="cmss-8">frameworks may be found in </span><span class="cite"><span 
class="cmss-8">[</span><a 
href="#Xskel-survey"><span 
class="cmss-8">17</span></a><span 
class="cmss-8">]</span></span><span 
class="cmss-8">.</span>                                    </div> </span></div>
<br /> <div class="caption" 
><span class="id">Figure&#x00A0;1.1: </span><span  
class="content">Algorithmic skeletons <span class="cite">[<a 
href="#XdispensaMarcoD:2013">14</a>]</span></span></div><!--tex4ht:label?: x1-10011 -->
                                                                  

                                                                  
<!--l. 83--><p class="indent" >   </div><hr class="endfigure">
<!--l. 85--><p class="indent" >   Fig.&#x00A0;<a 
href="#x1-10011">1.1<!--tex4ht:ref: fig:skeletons --></a> presents a brief history of the <span 
class="cmti-10">algorithmic skeleton </span>programming model.
For a more in-depth description, please refer to <span class="cite">[<a 
href="#XdispensaMarcoD:2013">14</a>]</span>.
<!--l. 89--><p class="indent" >   A number of papers and technical reports discuss the different features of this
programming environment <span class="cite">[<a 
href="#Xfastflow:tr-09-12">10</a>,&#x00A0;<a 
href="#Xff:wileybook:11">5</a>,&#x00A0;<a 
href="#Xdataflow:pdp:12">2</a>]</span>, the results achieved when parallelizing different
applications <span class="cite">[<a 
href="#Xbowtie-bwa:ff:multicore:biomed:14">18</a>,&#x00A0;<a 
href="#Xcwc:cloud:bib:13">11</a>,&#x00A0;<a 
href="#Xff:DPI:13">15</a>,&#x00A0;<a 
href="#Xyadtff:ccpe:13">8</a>,&#x00A0;<a 
href="#Xstochkit-ff:hibb:10">1</a>,&#x00A0;<a 
href="#Xfastflow:pdp:10">7</a>,&#x00A0;<a 
href="#Xfastflow:parco:09">6</a>]</span> and the use of <span 
class="cmss-10">FastFlow</span> as <span 
class="cmti-10">software accelerator</span>,
i.e. as a mechanism suitable for exploiting unused cores of a multi-core architecture
to speed up execution of sequential code <span class="cite">[<a 
href="#Xfastflow_acc:tr-10-03">3</a>,&#x00A0;<a 
href="#Xff:acc:europar:11">4</a>]</span>. This work represents instead a
tutorial aimed at describing the use of the main <span 
class="cmss-10">FastFlow</span> skeletons and patterns and
its programming techniques, providing a number of simple (and not so simple) usage
examples.
<!--l. 103--><p class="indent" >   This tutorial describes the basic <span 
class="cmss-10">FastFlow</span> concepts and the main skeletons
targeting <span 
class="cmbx-10">stream-parallelism</span>, <span 
class="cmbx-10">data-parallelism </span>and <span 
class="cmbx-10">data-flow parallelism</span>. It is
still not fully complete: for example important arguments and <span 
class="cmss-10">FastFlow</span> features such
as the <span 
class="cmss-10">FastFlow</span> memory allocator, the thread to core affinity mapping, GPGPU
programming and distributed systems programming are not yet covered in this
tutorial.
<div class="center" 
>
<!--l. 109--><p class="noindent" >
<!--l. 129--><p class="noindent" ><span class="framebox-c" 
style="width:34.49em;"><div class="minipage"><h5 class="likesubsubsectionHead"><a 
 id="x1-20001"></a><span 
class="cmss-8">Parallel patterns vs parallel skeletons:</span></h5>
<!--l. 129--><p class="noindent" ><span 
class="cmss-8">Algorithmic skeletons and parallel design patterns have been developed in completely disjoint</span>
<span 
class="cmss-8">research frameworks but with almost the same objective: providing the programmer of parallel</span>
<span 
class="cmss-8">applications with an effective programming environment. The two approaches have many</span>
<span 
class="cmss-8">similarities addressed at different levels of abstraction. Algorithmic skeletons are aimed at</span>
<span 
class="cmss-8">directly providing pre-defned, efficient building blocks for parallel computations to the</span>
<span 
class="cmss-8">application programmer, whereas parallel design patterns are aimed at providing directions,</span>
<span 
class="cmss-8">suggestions, examples and concrete ways to program those building blocks in different</span>
<span 
class="cmss-8">contexts.</span>
<!--l. 129--><p class="noindent" ><span 
class="cmss-8">We want to emphasise the similarities of these two concepts and so, throughout this tutorial,</span>
<span 
class="cmss-8">we use the terms pattern and skeleton interchangeably. For an in-depth discussion</span>
<span 
class="cmss-8">on the similarities and the main differences of the two approaches please refer to</span>
<span class="cite"><span 
class="cmss-8">[</span><a 
href="#XdispensaMarcoD:2013"><span 
class="cmss-8">14</span></a><span 
class="cmss-8">]</span></span><span 
class="cmss-8">.</span>                                                        </div> </span></div>
<!--l. 133--><p class="indent" >   This tutorial is organised as follow: Sec.&#x00A0;<a 
href="#x1-30001.1">1.1<!--tex4ht:ref: sec:ff:install --></a> describes how to download the
framework and compile programs, Sec.&#x00A0;<a 
href="#x1-50002">2<!--tex4ht:ref: sec:ff:principles --></a> recalls the <span 
class="cmss-10">FastFlow</span> application design
principles. Then, in Sec.&#x00A0;<a 
href="#x1-60003">3<!--tex4ht:ref: sec:streamparallel --></a> we introduce the main features of the stream-based
parallel programming in <span 
class="cmss-10">FastFlow</span>: how to wrap sequential code for handling a steam
of data, how to generate streams and how to combine pipelines, farms and loop
skeletons, how to set up farms and pipelines as software accelerator. In Sec.&#x00A0;<a 
href="#x1-270004">4<!--tex4ht:ref: sec:dataparallel --></a> we
introduce data-parallel computations in <span 
class="cmss-10">FastFlow</span>. ParallelFor, ParallelForReduce,
ParallelForPipeReduce and Map are presented in this section. Finally, in Sec.&#x00A0;<a 
href="#x1-430005">5<!--tex4ht:ref: sec:dataflow --></a>, the
macro data-flow programming model provided by the <span 
class="cmss-10">FastFlow</span> framework is
presented.
                                                                  

                                                                  
   <h3 class="sectionHead"><span class="titlemark">1.1   </span> <a 
 id="x1-30001.1"></a>Installation and program compilation</h3>
<!--l. 4--><p class="noindent" ><span 
class="cmss-10">FastFlow</span> is provided as a set of header files. Therefore the installation process is
trivial, as it only requires to download the last version of the <span 
class="cmss-10">FastFlow</span> source code
from the SourceForge (<a 
href="http://sourceforge.net/projects/mc-fastflow/" class="url" ><span 
class="pcrr7t-">http://sourceforge.net/projects/mc-fastflow/</span></a>)
by using <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">svn</span></span></span>:
<div class="center" 
>
<!--l. 8--><p class="noindent" >
<!--l. 10--><p class="noindent" ><span 
class="pcrr7t-x-x-80">svn co https://svn.code.sf.net/p/mc-fastflow/code fastflow</span></div>
<!--l. 12--><p class="noindent" >Once the code has been downloaded (with the above <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">svn</span></span></span> command, a <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">fastflow</span></span></span> folder
will be created in the current directory), the directory containing the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff</span></span></span>
sub-directory with the <span 
class="cmss-10">FastFlow</span> header files should be named in the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">-I</span></span></span> flag of <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">g++</span></span></span>,
such that the header files may be correctly found.
<!--l. 17--><p class="indent" >   For convenience may be useful to set the environment variable <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">FF_ROOT</span></span></span> to point
to the <span 
class="cmss-10">FastFlow</span> source directory. For example, if the <span 
class="cmss-10">FastFlow</span> tarball (or the svn
checkout) is extracted into your home directory with the name <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">fastflow</span></span></span>, you may
set <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">FF_ROOT</span></span></span> as follows (bash syntax):
<div class="center" 
>
<!--l. 21--><p class="noindent" >
<!--l. 22--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">export</span><span 
class="pcrr7t-">&#x00A0;FF_ROOT="$HOME/fastflow</span></span></span></div>
<!--l. 24--><p class="noindent" >
<!--l. 26--><p class="indent" >   Take into account that, since <span 
class="cmss-10">FastFlow</span> is provided as a set of <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">.hpp</span></span></span> source files,
the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">-O3</span></span></span> switch is essential to obtain good performance. Compiling with no <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">-O3</span></span></span>
compiler flag will lead to poor performance because the run-time code will not be
optimised by the compiler. Also, remember that the correct compilation
of <span 
class="cmss-10">FastFlow</span> programs requires linking the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">pthread</span></span></span> library (<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">-lpthread</span></span></span>
flag).
<div class="center" 
>
<!--l. 33--><p class="noindent" >
<!--l. 34--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">g++</span><span 
class="pcrr7t-">&#x00A0;-std=c++11</span><span 
class="pcrr7t-">&#x00A0;-I$FF_ROOT</span><span 
class="pcrr7t-">&#x00A0;-O3</span><span 
class="pcrr7t-">&#x00A0;test.cpp</span><span 
class="pcrr7t-">&#x00A0;-o</span><span 
class="pcrr7t-">&#x00A0;test</span><span 
class="pcrr7t-">&#x00A0;-lpthread</span></span></span></div>
<!--l. 37--><p class="noindent" >
   <h4 class="subsectionHead"><span class="titlemark">1.1.1   </span> <a 
 id="x1-40001.1.1"></a>Tests and examples</h4>
<!--l. 39--><p class="noindent" >In this tutorial a set of simple usage examples and small applications are
described. In almost all cases, the code can be directly copy-pasted into a text
editor and then compiled as described above. For convenience all codes are
provided in a separate tarball file <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">fftutorial_source_code.tgz</span></span></span> with a
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">Makefile</span></span></span>.
                                                                  

                                                                  
<!--l. 45--><p class="indent" >   At the beginning of all tests and examples presented, there is included the file
name containing the code ready to be compiled and executed, for example:
<!--l. 48-->
<div class="lstlisting" id="listing-1"><span class="tlabel"><a 
 id="x1-4001r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">****************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-4002r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">hello</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-4003r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-4004r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">iostream</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-4005r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">node</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-4006r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-4007r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myNode</span><span 
class="cmr-7">:</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-4008r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmr-7">....</span>
   </div>
<!--l. 58--><p class="noindent" >means that the above code is in the file <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">hello_node.cpp</span></span></span>.
                                                                  

                                                                  
   <h2 class="chapterHead"><span class="titlemark">Chapter&#x00A0;2</span><br /><a 
 id="x1-50002"></a>Design principles</h2>
<!--l. 4--><p class="noindent" ><span 
class="cmss-10">FastFlow</span> has been originally designed to provide programmers with efficient
parallelism exploitation patterns suitable to implement (fine grain) stream parallel
applications. In particular, <span 
class="cmss-10">FastFlow</span> has been designed
     <ul class="itemize1">
     <li class="itemize">to  promote  high-level  parallel  programming,  and  in  particular  skeletal
     programming (i.e. pattern-based explicit parallel programming), and
     </li>
     <li class="itemize">to promote efficient programming of applications for multi-core.</li></ul>
<!--l. 15--><p class="indent" >   More recently, within the activities of the EU FP7 STREP project
&#8221;ParaPhrase&#8221;<span class="footnote-mark"><a 
href="tutorial2.html#fn1x5"><sup class="textsuperscript">1</sup></a></span><a 
 id="x1-5001f1"></a> 
the <span 
class="cmss-10">FastFlow</span> framework has been extended in several ways. In particular, in the
framework have been added:
     <ul class="itemize1">
     <li class="itemize">several new high-level patterns
     </li>
     <li class="itemize">facilities  to  support  coordinated  execution  of  <span 
class="cmss-10">FastFlow</span>  program  on
     distributed multi-core machines
     </li>
     <li class="itemize">support for execution of new data parallel patterns on GPGPUs
     </li>
     <li class="itemize">new low-level parallel building blocks allowing to build almost any kind of
     streaming graph and parallel patterns.</li></ul>
<!--l. 27--><p class="indent" >   The whole programming framework has been incrementally developed according
to a layered design on top of Pthread/C++ standard programming framework as
sketched in Fig.&#x00A0;<a 
href="#x1-50021">2.1<!--tex4ht:ref: fig:ff:layers --></a>).
<!--l. 32--><p class="indent" >   <hr class="figure"><div class="figure" 
>
                                                                  

                                                                  
<a 
 id="x1-50021"></a>
                                                                  

                                                                  
<div  
class="centerline">         <img 
src="tutorial0x.png" alt="PIC" class="graphics" width="224.2479pt" height="176.38159pt" ><!--tex4ht:graphics  
name="tutorial0x.png" src="figures/ff_architecture_new_bw.eps"  
-->         </div>
<br /> <div class="caption" 
><span class="id">Figure&#x00A0;2.1: </span><span  
class="content">Layered <span 
class="cmss-10">FastFlow</span> design</span></div><!--tex4ht:tlabel?: x1-50021 -->
                                                                  

                                                                  
<!--l. 36--><p class="indent" >   </div><hr class="endfigure">
<!--l. 38--><p class="indent" >   The <span 
class="cmbx-10">Building blocks </span>layer provides the basics blocks to build (and generate via
C++ header-only templates) the run-time support of core patterns. Typical objects
at this level are queues (e.g. lock-free SPSC queues, bounded and unbounded),
process and thread containers (as C++ classes) mediator threads/processes
(extensible and configurable schedulers and gatherers). The shared-memory run-time
support extensively uses non-blocking lock-free algorithms, the distributed run-time
support employs zero-copy messaging, the GPGPUs support exploits asynchrony and
SIMT optimised algorithms.
<!--l. 43--><p class="indent" >   The <span 
class="cmbx-10">Core patterns </span>layer provides a general data-centric parallel programming
model with its run-time support, which is designed to be minimal and reduce to the
minimum typical sources of overheads in parallel programming. At this level there are
two patterns (<span 
class="cmti-10">task-farm </span>and all its variants and <span 
class="cmti-10">pipeline</span>) and one pattern-modifier
(<span 
class="cmti-10">feedback</span>). They make it possible to build very general (deadlock-free) cyclic process
networks. They are not graphs of tasks, they are graphs of parallel executors
(processes/threads). Tasks or data items flows across them according to the
data-flow model. Overall, the programming model can be envisioned as a
shared-memory streaming model, i.e. a shared-memory model equipped with
message-passing synchronisations. They are implemented on top of building
blocks.
<!--l. 52--><p class="indent" >   The <span 
class="cmbx-10">High-level patterns </span>are clearly characterised in a specific usage context
and are targeted to the parallelisation of sequential (legacy) code. Examples are
exploitation of loop parallelism (<span 
class="cmti-10">ParallelFor </span>and its variants), stream parallelism
(<span 
class="cmti-10">pipeline </span>and <span 
class="cmti-10">task-farm</span>), data-parallel algorithms (<span 
class="cmti-10">map</span>, <span 
class="cmti-10">poolEvolution</span>, <span 
class="cmti-10">stencil</span>,
<span 
class="cmti-10">StencilReduce</span>), execution of general workflows of tasks (<span 
class="cmti-10">mdf </span>- Macro Data-Flow),
etc. They are typically equipped with self-optimisation capabilities (e.g.
load-balancing, grain auto-tuning, parallelism-degree auto-tuning) and exhibit
limited nesting capability. Some of them targets specific devices (e.g. GPGPUs).
They are implemented on top of core patterns.
<!--l. 59--><p class="indent" >   Parallel application programmers are supposed to use <span 
class="cmss-10">FastFlow</span> directly
exploiting the parallel patterns available at the &#8221;High-level&#8221; or &#8221;Core&#8221; levels. In
particular:
     <ul class="itemize1">
     <li class="itemize">defining sequential concurrent activities, by sub classing a proper <span 
class="cmss-10">FastFlow</span>
     class, the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> (or <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_minode</span></span></span> and <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_monode</span></span></span>) class, and
     </li>
     <li class="itemize">building  complex  stream  parallel  patterns  by  hierarchically  composing
     sequential  concurrent  activities,  <span 
class="cmti-10">pipeline  </span>patterns,  <span 
class="cmti-10">feedbacks</span>,  <span 
class="cmti-10">task-farm</span>
     patterns  and  their  &#8221;specialised&#8221;  versions  implementing  more  complex
     parallel patterns.</li></ul>
<!--l. 144--><p class="indent" >   Concerning the usage of <span 
class="cmss-10">FastFlow</span> to support parallel application development on
shared memory multi-core, the framework provides two possible abstractions of
structured parallel computation:
                                                                  

                                                                  
     <ul class="itemize1">
     <li class="itemize">a <span 
class="cmti-10">skeleton program abstraction </span>used to implement applications completely
     modelled according to the algorithmic skeleton concepts. When using this
     abstraction, the programmer writes a parallel application by providing
     the  business  logic  code,  wrapped  into  proper  <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> sub-classes,  a
     skeleton (composition) modelling the parallelism exploitation pattern of
     the application and a single command starting the skeleton computation
     and awaiting for its termination.
     </li>
     <li class="itemize">an <span 
class="cmti-10">accelerator abstraction </span>used to parallelize (and therefore to accelerate)
     only some parts of an existing application. In this case, the programmer
     provides a skeleton composition which is run on the &#8221;spare&#8221; cores of the
     architecture and implements a parallel version of part of the business logic
     of the application, e.g. the one computing a given <span 
class="cmmi-10">f</span>(<span 
class="cmmi-10">x</span>). The skeleton
     composition,  if  operating  on  stream  (i.e.  pipeline  or  task-farm  based
     compositions), will have its own input and output channels. When an
     <span 
class="cmmi-10">f</span>(<span 
class="cmmi-10">x</span><sub><span 
class="cmmi-7">j</span></sub>) has to be computed within the application, rather than writing code
     to call to the sequential <span 
class="cmmi-10">f </span>code, the programmer may insert asynchronous
     &#8221;offloading&#8221; calls for sending <span 
class="cmmi-10">x</span><sub><span 
class="cmmi-7">j</span></sub>  to the accelerator skeleton. Later on,
     when the result of <span 
class="cmmi-10">f</span>(<span 
class="cmmi-10">x</span><sub><span 
class="cmmi-7">j</span></sub>) has to be used, the code needed for &#8221;reading&#8221;
     accelerator results may be used to retrieve the computed values.</li></ul>
<!--l. 171--><p class="noindent" >This second abstraction fully implements the &#8221;minimal disruption&#8221; principle stated by
Cole in his skeleton manifesto <span class="cite">[<a 
href="#Xcole:manifesto:02">13</a>]</span>, as the programmer using the accelerator is only
required to program a couple of <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">offload/get_result</span></span></span> primitives in place of the
single <span 
class="cmmi-10">&#x2026;</span> = <span 
class="cmmi-10">f</span>(<span 
class="cmmi-10">x</span>) function call statement (see Sec.&#x00A0;<a 
href="#x1-240003.7">3.7<!--tex4ht:ref: sec:ff:accelerator --></a>).
                                                                  

                                                                  
   <h2 class="chapterHead"><span class="titlemark">Chapter&#x00A0;3</span><br /><a 
 id="x1-60003"></a>Stream parallelism</h2>
<!--l. 4--><p class="noindent" >An application may operate on values organised as <span 
class="cmti-10">streams</span>. A <span 
class="cmti-10">stream </span>is a possibly
infinite sequence of values, all of them having the same data type, e.g. a stream of
images (not necessarily all having the same format), a stream of files, a stream of
network packets, a stream of bits, etc.
<!--l. 9--><p class="indent" >   A complex streaming application may be seen as a graph (or workflow) of
computing modules (sequential or parallels) whose arcs connecting them bring
streams of data of different types. The typical requirements of such a complex
streaming application is to guarantee a given Quality of Service imposed
by the application context. In a nutshell, that means that the modules of
the workflow describing the application have to be able to sustain a given
throughput.
<!--l. 16--><p class="indent" >   There are many applications in which the input streams are primitive, because
they are generated by external sources (e.g. HW sensors, networks, etc..) or I/O.
However, there are cases in which streams are not primitive, but it is possible that
they can be generated directly within the program. For example, sequential loops or
iterators. In the following we will see how to generate a stream of data in <span 
class="cmss-10">FastFlow</span>
starting from sequential loops.
   <h3 class="sectionHead"><span class="titlemark">3.1   </span> <a 
 id="x1-70003.1"></a>Stream parallel skeletons</h3>
<!--l. 26--><p class="noindent" >Stream parallel skeletons are those natively operating on streams, notably <span 
class="cmti-10">pipeline</span>
and <span 
class="cmti-10">task-farm </span>(or simply <span 
class="cmti-10">farm</span>).
<!--l. 29--><p class="noindent" >
   <h5 class="likesubsubsectionHead"><a 
 id="x1-80003.1"></a><span 
class="cmti-10">pipeline</span></h5>
<!--l. 31--><p class="noindent" >The <span 
class="cmti-10">pipeline </span>skeleton is typically used to model computations expressed in stages. In
the general case, a pipeline may have more than two stages, and it can be built as a
single pipeline with <span 
class="cmmi-10">N </span>stages or as pipeline of pipelines. Given a stream of input
tasks
   <center class="math-display" >
<img 
src="tutorial1x.png" alt="xm, ...,x1
" class="math-display" ></center>
<!--l. 36--><p class="nopar" > the pipeline with stages
   <center class="math-display" >
<img 
src="tutorial2x.png" alt="s1,...,sp
" class="math-display" ></center>
<!--l. 38--><p class="nopar" > computes the output stream
   <center class="math-display" >
<img 
src="tutorial3x.png" alt="sp(...s2(s1(xm))...),...,sp(...s2(s1(x1))...)
" class="math-display" ></center>
<!--l. 40--><p class="nopar" >
<!--l. 42--><p class="indent" >   The parallel semantics of the pipeline skeleton ensures that all the stages will be
execute in parallel. It is possible to demonstrate that the total time required to
entirely compute a single task (latency) is close to the sum of the times required to
compute the different stages. And, the time needed to output a new result
(throughput) is close to time spent to compute a single task by the slowest stage in
the pipeline.
<!--l. 50--><p class="noindent" >
   <h5 class="likesubsubsectionHead"><a 
 id="x1-90003.1"></a><span 
class="cmti-10">task-farm</span></h5>
<!--l. 52--><p class="noindent" >The <span 
class="cmti-10">task-farm </span>(sometimes also called master-worker) is a stream parallel paradigm
based on the replication of a purely functional computation. The <span 
class="cmti-10">farm </span>skeleton is
used to model embarrassingly parallel computations. The only functional parameter
of a farm is the function <span 
class="cmmi-10">f </span>needed to compute the single task. The function <span 
class="cmmi-10">f </span>is
stateless. Only under particular conditions, functions with internal state, may be
used.
<!--l. 59--><p class="indent" >   Given a stream of input tasks
   <center class="math-display" >
<img 
src="tutorial4x.png" alt="xm, ...,x1
" class="math-display" ></center>
<!--l. 60--><p class="nopar" > the farm with function <span 
class="cmmi-10">f </span>computes the output stream
   <center class="math-display" >
<img 
src="tutorial5x.png" alt="f(xm),...,f(x1)
" class="math-display" ></center>
<!--l. 63--><p class="nopar" > Its parallel semantics ensures that it will process tasks such that the single task
latency is close to the time needed to compute the function <span 
class="cmmi-10">f </span>sequentially, while the
throughput (only under certain conditions) is close to <img 
src="tutorial6x.png" alt="f
n"  class="frac" align="middle"> where <span 
class="cmmi-10">n </span>is the number of
parallel agents used to execute the farm (called <span 
class="cmti-10">workers</span>), i.e. its parallelism
degree.
<!--l. 71--><p class="indent" >   The concurrent scheme of a farm is composed of three distinct parts: the
<span 
class="cmti-10">Emitter</span>, the pool of workers and the <span 
class="cmti-10">Collector</span>. The Emitter gets a farm&#8217;s input
tasks and distributes them to workers using a given scheduling strategy. The
Collector collects tasks from workers and sends them to the farm&#8217;s output
stream.
<!--l. 82--><p class="indent" >   <hr class="figure"><div class="figure" 
>
                                                                  

                                                                  
<a 
 id="x1-90011"></a>
                                                                  

                                                                  
<div  
class="centerline">      <img 
src="tutorial7x.png" alt="PIC" class="graphics" width="258.75pt" height="123.74991pt" ><!--tex4ht:graphics  
name="tutorial7x.png" src="figures/nodes.eps"  
-->      </div>
<br />  <div class="caption" 
><span class="id">Figure&#x00A0;3.1:   </span><span  
class="content"><span 
class="cmss-10">FastFlow</span>   basic   abstractions:   channel   (implemented   as   a
SPSC  bounded  or  unbounded  lock-free  queue),  single-input  single-output
node  (<span 
class="cmti-10">ff</span><span 
class="cmti-10">_node</span>),  single-input  multi-output  (<span 
class="cmti-10">ff</span><span 
class="cmti-10">_monode</span>)  node,  multi-input
single-output   node   (<span 
class="cmti-10">ff</span><span 
class="cmti-10">_minode</span>),   composition   (<span 
class="cmti-10">pipeline</span>)   and   functional
replication and MISD computation <span 
class="cmti-10">task-farm</span>, loopback channel (<span 
class="cmti-10">feedback</span>).</span></div><!--tex4ht:tlabel?: x1-90011 -->
                                                                  

                                                                  
<!--l. 89--><p class="indent" >   </div><hr class="endfigure">
   <h3 class="sectionHead"><span class="titlemark">3.2   </span> <a 
 id="x1-100003.2"></a><span 
class="cmss-10">FastFlow</span> abstractions</h3>
<!--l. 93--><p class="noindent" >In this section we describe the sequential concurrent activities (<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span>,
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_minode</span></span></span>, <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_monode</span></span></span> and <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_dnode</span></span></span>), and the &#8221;core&#8221; skeletons <span 
class="cmti-10">pipeline </span>and
<span 
class="cmti-10">task-farm </span>(see Fig&#x00A0;<a 
href="#x1-90011">3.1<!--tex4ht:ref: fig:ff:nodes --></a>) used as building blocks to model composition and parallel
executions. The core skeletons are <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> derived objects as well, so they can be
nested and composed in almost any arbitrary way. The <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">feedback</span></span></span> pattern modifier
can also be used in the <span 
class="cmti-10">pipeline </span>and <span 
class="cmti-10">task-farm </span>to build complex cyclic streaming
networks.
<!--l. 101--><p class="noindent" >
   <h4 class="subsectionHead"><span class="titlemark">3.2.1   </span> <a 
 id="x1-110003.2.1"></a><span 
class="cmti-10">ff</span><span 
class="cmti-10">_node</span></h4>
<!--l. 104--><p class="noindent" >The <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> sequential concurrent activity abstraction provides a means to define a
sequential activity (via its <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">svc</span></span></span> method) that a) processes data items appearing on a
<span 
class="cmbx-10">single input channel </span>and b) delivers the related results onto a <span 
class="cmbx-10">single output</span>
<span 
class="cmbx-10">channel</span>.
<!--l. 109--><p class="indent" >   In a multi-core, a <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> object is implemented as a <span 
class="cmbx-10">non-blocking thread</span>
(or a set of non-blocking threads). This means that the number of <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span>(s)
concurrently running should not exceed the number of logical cores of the platform at
hand.
<!--l. 114--><p class="indent" >   The <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> class actually defines a number of methods, the following three
virtual methods are of particular importance: <!--l. 116-->
<div class="lstlisting" id="listing-2"><span class="tlabel"><a 
 id="x1-11001r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmbx-7">public</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11002r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">virtual</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">encapsulates</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">user</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">business</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">code</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11003r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">virtual</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">_init</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">initialization</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">code</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11004r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">virtual</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{}</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">finalization</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">code</span>
   </div>
<!--l. 122--><p class="indent" >   The first is the one defining the behaviour of the node while processing the input
stream data items. The other two methods are automatically invoked once and for all
by the <span 
class="cmss-10">FastFlow</span> RTS when the concurrent activity represented by the node is started
(<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">svc_init</span></span></span>) and right before it is terminated (<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">svc_end</span></span></span>). These virtual methods
may be overwritten in the user supplied <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> sub-classes to implement
initialisation code and finalisation code, respectively. Since the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">svc</span></span></span> method is a pure
virtual function, it <span 
class="cmti-10">must </span>be overwritten.
<!--l. 132--><p class="indent" >   A <span 
class="cmss-10">FastFlow</span> <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> can be defined as follow: <!--l. 133-->
<div class="lstlisting" id="listing-3"><span class="tlabel"><a 
 id="x1-11005r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">node</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11006r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11007r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myStage</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11008r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">_init</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">not</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mandatory</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11009r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">initialize</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11010r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">returing</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">non</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">zero</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">means</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">!</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11011r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11012r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11013r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">business</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">code</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">here</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">working</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">on</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">input</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11014r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">may</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">a</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">or</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">,</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">,</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_OUT</span><span 
class="cmr-7">,</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">_NOFREEZE</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11015r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11016r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">not</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mandatory</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11017r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">finalize</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">free</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">resources</span><span 
class="cmr-7">,...</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11018r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11019r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span>
   </div>
<!--l. 152--><p class="indent" >   The <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> behaves as a loop that gets an input task (coming from the input
channel), i.e. the input parameter of the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">svc</span></span></span> method, and produces one or more
outputs, i.e. the return value of the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">svc</span></span></span> method or the invocation of the
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_send_out</span></span></span> method that can be called inside the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">svc</span></span></span> method. The loop
terminates either if the output provided or the input received is a special value:
&#8221;End-Of-Stream&#8221; (EOS). The EOS is propagated across channels to the next
                                                                  

                                                                  
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span>.
<!--l. 159--><p class="indent" >   Particular cases of <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span>s may be simply implemented with no input channel
or no output channel. The former is used to install a concurrent activity <span 
class="cmti-10">generating</span>
an output stream (e.g. from data items read from keyboard or from a disk file); the
latter to install a concurrent activity <span 
class="cmti-10">consuming </span>an input stream (e.g. to present
results on a video, to store them on disk or to send output packets into the
network).
<!--l. 168--><p class="indent" >   The simplified life cycle of an <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> is informally described in the following
pseudo-code:
                                                                  

                                                                  
   <div class="verbatim" id="verbatim-1">
do&#x00A0;{
&#x00A0;<br />&#x00A0;if&#x00A0;(svc_init()&#x00A0;&#x003C;&#x00A0;0)&#x00A0;break;
&#x00A0;<br />&#x00A0;do&#x00A0;{
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;intask&#x00A0;=&#x00A0;input_stream.get();
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;if&#x00A0;(task&#x00A0;==&#x00A0;EOS)&#x00A0;output_stream.put(EOS);
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;else&#x00A0;{
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;&#x00A0;outtask&#x00A0;=&#x00A0;svc(intask);
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;&#x00A0;output_stream.put(EOS);
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;}
&#x00A0;<br />&#x00A0;}&#x00A0;while(outtask&#x00A0;!=&#x00A0;EOS);
&#x00A0;<br />&#x00A0;svc_end();
&#x00A0;<br />&#x00A0;termination&#x00A0;=&#x00A0;true;
&#x00A0;<br />&#x00A0;if&#x00A0;(thread_has_to_be_frozen()&#x00A0;==&#x00A0;"yes")&#x00A0;{
&#x00A0;<br />&#x00A0;&#x00A0;freeze_the_thread_and_wait_for_thawing();
&#x00A0;<br />&#x00A0;&#x00A0;termination&#x00A0;=&#x00A0;false;
&#x00A0;<br />&#x00A0;}
&#x00A0;<br />}&#x00A0;while(!termination);
</div>
<!--l. 189--><p class="nopar" >
<!--l. 192--><p class="indent" >   It is also possible to return from a <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> the value <span 
class="cmti-10">GO</span><span 
class="cmti-10">_ON</span>. This special value
tells the run-time system (RTS) that there are no more tasks to send to the next
stage and that the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> is ready to receive the next input task (if any). The
<span 
class="cmti-10">GO</span><span 
class="cmti-10">_ON </span>task is not propagated to the next stage. Other special values can be
returned by an <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span>, such as <span 
class="cmti-10">GO</span><span 
class="cmti-10">_OUT </span>and <span 
class="cmti-10">EOS</span><span 
class="cmti-10">_NOFREEZE</span>, both of
which are not propagated to the next stages and are used to exit the main
node loop. The difference is that while <span 
class="cmti-10">GO</span><span 
class="cmti-10">_OUT </span>allows the thread to be
put to sleep (if it has been started with <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">run_then_freeze</span></span></span>), the second
one instead allows to jump directly to the point where input channels are
checked for receiving new tasks without having the possibility to stop the
thread.
<!--l. 201--><p class="indent" >   An <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> cannot be started alone (unless the method <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">run()</span></span></span> and <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">wait()</span></span></span> are
overwritten). Instead, it is assumed that <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> derived objects are used as
pipeline stages or task-farm workers. In order to show how to execute and wait for
termination of <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> derived objects, we provide here a simple wrapper class (in
the next sections we will see that <span 
class="cmti-10">pipeline </span>and <span 
class="cmti-10">task-farm </span>are <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> derived
objects) : <!--l. 206-->
<div class="lstlisting" id="listing-4"><span class="tlabel"><a 
 id="x1-11020r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">****************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11021r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">hello</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11022r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11023r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">iostream</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11024r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">node</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11025r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11026r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myNode</span><span 
class="cmr-7">:</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11027r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">called</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">once</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">at</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">beginning</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">of</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">life</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">cycle</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11028r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">_init</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11029r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Hello</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">I</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">re</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">)</span><span 
class="cmr-7">starting</span><span 
class="cmr-7">...</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11030r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">counter</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11031r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">means</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">success</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11032r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11033r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">called</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">for</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">each</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">input</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">of</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stream</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">or</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">until</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11034r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">returned</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">has</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">no</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">input</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stream</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11035r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11036r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(++</span><span 
class="cmr-7">counter</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">5)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11037r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Hi</span><span 
class="cmr-7">!</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">counter</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11038r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">keep</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">calling</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">me</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">again</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11039r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11040r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">called</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">once</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">at</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">end</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">of</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">life</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">cycle</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11041r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Goodbye</span><span 
class="cmr-7">!</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11042r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11043r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11044r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">starts</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">and</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">waits</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">for</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">its</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">termination</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11045r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">bool</span><span 
class="cmr-7">=</span><span 
class="cmbx-7">false</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11046r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">::</span><span 
class="cmr-7">run</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11047r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">::</span><span 
class="cmr-7">wait</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11048r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11049r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">first</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sets</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">freeze</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">flag</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">then</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">starts</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11050r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_then</span><span 
class="cmr-7">_freeze</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">::</span><span 
class="cmr-7">freeze</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_run</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11051r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">waits</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">for</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pause</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">i</span><span 
class="cmr-7">.</span><span 
class="cmr-7">e</span><span 
class="cmr-7">.</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">until</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">put</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sleep</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11052r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">wait</span><span 
class="cmr-7">_freezing</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">::</span><span 
class="cmr-7">wait</span><span 
class="cmr-7">_freezing</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11053r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">waits</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">for</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">termination</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11054r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">wait</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">::</span><span 
class="cmr-7">wait</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11055r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11056r37"></a><span 
class="cmr-7">37</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">counter</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11057r38"></a><span 
class="cmr-7">38</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11058r39"></a><span 
class="cmr-7">39</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11059r40"></a><span 
class="cmr-7">40</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myNode</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mynode</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11060r41"></a><span 
class="cmr-7">41</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">mynode</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11061r42"></a><span 
class="cmr-7">42</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myNode</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11062r43"></a><span 
class="cmr-7">43</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">first</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">run</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">done</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11063r44"></a><span 
class="cmr-7">44</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11064r45"></a><span 
class="cmr-7">45</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">do</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11065r46"></a><span 
class="cmr-7">46</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">mynode</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_then</span><span 
class="cmr-7">_freeze</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11066r47"></a><span 
class="cmr-7">47</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myNode</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11067r48"></a><span 
class="cmr-7">48</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">mynode</span><span 
class="cmr-7">.</span><span 
class="cmr-7">wait</span><span 
class="cmr-7">_freezing</span><span 
class="cmr-7">()</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11068r49"></a><span 
class="cmr-7">49</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">waiting</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myNode</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11069r50"></a><span 
class="cmr-7">50</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">run</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">done</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11070r51"></a><span 
class="cmr-7">51</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">while</span><span 
class="cmr-7">(++</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">3)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11071r52"></a><span 
class="cmr-7">52</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">mynode</span><span 
class="cmr-7">.</span><span 
class="cmr-7">wait</span><span 
class="cmr-7">()</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11072r53"></a><span 
class="cmr-7">53</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">waiting</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myNode</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11073r54"></a><span 
class="cmr-7">54</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-11074r55"></a><span 
class="cmr-7">55</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 263--><p class="noindent" >In this example, a <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">myNode</span></span></span> has been defined redefining all methods needed to execute
the node, put the node to sleep (freeze the node), wake-up the node (thaw the node)
and waiting for its termination.
<!--l. 268--><p class="indent" >   Line 41 starts the computation of the node and waits for its termination
synchronously. At line 46 the node is started again but in this case the
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">run_then_freeze</span></span></span> method first sets the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node::freezing</span></span></span> flag and
then starts the node (i.e. creates the thread which execute the node). The
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node::freezing</span></span></span> flag tells the run-time that the node has to be put to sleep
                                                                  

                                                                  
(<span 
class="cmti-10">frozen </span>using our terminology) instead of terminating it when an <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">EOS</span></span></span> is received in
input or it is returned by the node itself. The node runs asynchronously with respect
to the main thread, so in order to synchronise the executions, the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">wait_freezing</span></span></span>
method is used (it waits until the node is frozen by the <span 
class="cmss-10">FastFlow</span> run-time).
When the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">run_then_freeze</span></span></span> method is called again, since the node is
frozen, instead of starting another thread, the run-time just &#8221;thaws&#8221; the
thread.
<!--l. 281--><p class="indent" >   <hr class="figure"><div class="figure" 
>
                                                                  

                                                                  
<a 
 id="x1-110752"></a>
                                                                  

                                                                  
<div  
class="centerline"><img 
src="tutorial8x.png" alt="PIC" class="graphics" width="327.74895pt" height="100.26433pt" ><!--tex4ht:graphics  
name="tutorial8x.png" src="figures/ff_pipe.eps"  
--></div>
<br /> <div class="caption" 
><span class="id">Figure&#x00A0;3.2: </span><span  
class="content">Possible <span 
class="cmti-10">pipeline </span>and <span 
class="cmti-10">pipeline</span>+<span 
class="cmti-10">feedback</span> <span 
class="cmss-10">FastFlow</span> skeleton versions.</span></div><!--tex4ht:tlabel?: x1-110752 -->
                                                                  

                                                                  
<!--l. 285--><p class="indent" >   </div><hr class="endfigure">
   <h4 class="subsectionHead"><span class="titlemark">3.2.2   </span> <a 
 id="x1-120003.2.2"></a><span 
class="cmti-10">ff</span><span 
class="cmti-10">_pipe</span></h4>
<!--l. 290--><p class="noindent" >Pipeline skeletons in <span 
class="cmss-10">FastFlow</span> can be easily instantiated using the C++11-based
constructors available in the latest release of <span 
class="cmss-10">FastFlow</span>.
<!--l. 293--><p class="indent" >   The standard way to create a pipeline of n different stages in <span 
class="cmss-10">FastFlow</span> is to create
n distinct <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> objects and then pass them in the correct order to the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_pipe</span></span></span>
constructor<span class="footnote-mark"><a 
href="tutorial3.html#fn1x6"><sup class="textsuperscript">1</sup></a></span><a 
 id="x1-12001f1"></a> .
For example, the following code creates a 3-stage pipeline: <!--l. 298-->
<div class="lstlisting" id="listing-5"><span class="tlabel"><a 
 id="x1-12002r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">****************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12003r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">hello</span><span 
class="cmr-7">_pipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12004r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12005r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">define</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">HAS</span><span 
class="cmr-7">_CXX11</span><span 
class="cmr-7">_VARIADIC</span><span 
class="cmr-7">_TEMPLATES</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">needed</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">use</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12006r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">pipeline</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">defines</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipeline</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">and</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12007r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12008r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmbx-7">typedef</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myTask</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">this</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">my</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">input</span><span 
class="cmr-7">/</span><span 
class="cmr-7">output</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">type</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12009r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">firstStage</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">st</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12010r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12011r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sending</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">10</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">tasks</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">next</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12012r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">10;++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12013r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_send</span><span 
class="cmr-7">_out</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myTask</span><span 
class="cmr-7">(</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12014r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">End</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">Of</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">Stream</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12015r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12016r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12017r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">secondStage</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2</span><span 
class="cmr-7">nd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12018r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12019r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">t</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pass</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">next</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12020r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12021r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12022r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">thirdStage</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">3</span><span 
class="cmr-7">rd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12023r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12024r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myTask</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">=</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">myTask</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12025r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Hello</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">I</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">3,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">I</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">ve</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">received</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12026r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12027r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12028r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12029r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12030r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">firstStage</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_1</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12031r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">secondStage</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_2</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12032r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">thirdStage</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_3</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12033r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">myTask</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">(&amp;</span><span 
class="cmr-7">_1</span><span 
class="cmr-7">,&amp;</span><span 
class="cmr-7">_2</span><span 
class="cmr-7">,&amp;</span><span 
class="cmr-7">_3</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12034r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12035r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12036r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 335--><p class="indent" >   To execute the pipeline it is possible to use the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">run_and_wait_end()</span></span></span> method.
This method starts the pipeline and synchronously waits for its termination
<span class="footnote-mark"><a 
href="tutorial4.html#fn2x6"><sup class="textsuperscript">2</sup></a></span><a 
 id="x1-12037f2"></a>.
<!--l. 340--><p class="indent" >   For example, the following
<!--l. 342--><p class="indent" >   The <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_pipe</span></span></span> constructor also accepts as pipeline stage functions with signature
<span 
class="pcrr7t-">T&#x22C6;(&#x22C6;F)(T&#x22C6;,ff</span><span 
class="pcrr7t-">_node&#x22C6;const)</span>. This is because in many situations it is simpler to
write a function than an <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span>. The <span 
class="cmss-10">FastFlow</span> run-time wraps those functions
in a <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> object whose pointer is passed as second parameter to the
function.
<!--l. 354--><p class="indent" >   As an example consider the following 3-stage pipeline : <!--l. 355-->
<div class="lstlisting" id="listing-6"><span class="tlabel"><a 
 id="x1-12038r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">****************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12039r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">hello</span><span 
class="cmr-7">_pipe2</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12040r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12041r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">define</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">HAS</span><span 
class="cmr-7">_CXX11</span><span 
class="cmr-7">_VARIADIC</span><span 
class="cmr-7">_TEMPLATES</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">needed</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">use</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12042r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">pipeline</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">defines</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipeline</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">and</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12043r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12044r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmbx-7">typedef</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myTask</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">this</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">my</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">input</span><span 
class="cmr-7">/</span><span 
class="cmr-7">output</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">type</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12045r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmr-7">myTask</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">F1</span><span 
class="cmr-7">(</span><span 
class="cmr-7">myTask</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">,</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">st</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12046r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">static</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">count</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">10;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12047r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Hello</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">I</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">F1</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sending</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12048r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">count</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">?</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">(1)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">myTask</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12049r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12050r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">F2</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2</span><span 
class="cmr-7">nd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12051r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12052r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myTask</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">=</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">myTask</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12053r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Hello</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">I</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">F2</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">I</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">ve</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">received</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12054r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12055r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12056r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">F2</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12057r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmr-7">myTask</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">F3</span><span 
class="cmr-7">(</span><span 
class="cmr-7">myTask</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">,</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">3</span><span 
class="cmr-7">rd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12058r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myTask</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">=</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">myTask</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12059r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Hello</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">I</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">F3</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">I</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">ve</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">received</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12060r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12061r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12062r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12063r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">myTask</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">(</span><span 
class="cmr-7">F1</span><span 
class="cmr-7">,&amp;</span><span 
class="cmr-7">F2</span><span 
class="cmr-7">,</span><span 
class="cmr-7">F3</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12064r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12065r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12066r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 386--><p class="noindent" >Here 2 functions getting a <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">myTask</span></span></span> pointer as input and return type are used as
first and third stage of the pipeline whereas an <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> object is used for
the middle stage. Note that the first stage, generates 10 tasks and then an
EOS.
<!--l. 392--><p class="indent" >   Finally, it is also possible to add stages (of type <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span>) to a pipeline using the
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">add_stage</span></span></span> method as in the following sketch of code: <!--l. 394-->
<div class="lstlisting" id="listing-7"><span class="tlabel"><a 
 id="x1-12067r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12068r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">myTask</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">(</span><span 
class="cmr-7">F1</span><span 
class="cmr-7">,&amp;</span><span 
class="cmr-7">F2</span><span 
class="cmr-7">,</span><span 
class="cmr-7">F3</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12069r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">add</span><span 
class="cmr-7">_stage</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage4</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage4</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">an</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">derived</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">object</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12070r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">add</span><span 
class="cmr-7">_stage</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage5</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage5</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">an</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">derived</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">object</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12071r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12072r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-12073r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmsy-7">}</span>
   </div>
   <h4 class="subsectionHead"><span class="titlemark">3.2.3   </span> <a 
 id="x1-130003.2.3"></a><span 
class="cmti-10">ff</span><span 
class="cmti-10">_minode </span>and <span 
class="cmti-10">ff</span><span 
class="cmti-10">_monode</span></h4>
<!--l. 408--><p class="noindent" >The <span 
class="cmti-10">ff</span><span 
class="cmti-10">_minode </span>and the <span 
class="cmti-10">ff</span><span 
class="cmti-10">_monode </span>are <span 
class="cmbx-10">multi-input </span>and <span 
class="cmbx-10">multi-output</span> <span 
class="cmss-10">FastFlow</span>
nodes, respectively. By using these kinds of node, it is possible to build more complex
skeleton structures. For example, the following code implements a 4-stage pipeline
                                                                  

                                                                  
where each stage sends some of the tasks received in input back to the first stage.
<!--l. 412-->
<div class="lstlisting" id="listing-8"><span class="tlabel"><a 
 id="x1-13001r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">********************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13002r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">fancy</span><span 
class="cmr-7">_pipeline</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13003r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13004r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13005r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage0</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage1</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage2</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage3</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13006r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x02C6;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x02C6;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x02C6;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13007r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">\</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13008r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">\</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13009r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">\</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13010r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13011r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">define</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">HAS</span><span 
class="cmr-7">_CXX11</span><span 
class="cmr-7">_VARIADIC</span><span 
class="cmr-7">_TEMPLATES</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">needed</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">use</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13012r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">pipeline</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">defines</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipeline</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">and</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13013r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">defines</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_minode</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">and</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_monode</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13014r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13015r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">NUMTASKS</span><span 
class="cmr-7">=20;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13016r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage0</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_minode</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13017r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">_init</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">counter</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13018r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13019r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">task</span><span 
class="cmr-7">==</span><span 
class="cmr-7">NULL</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13020r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=1;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">NUMTASKS</span><span 
class="cmr-7">;++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13021r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_send</span><span 
class="cmr-7">_out</span><span 
class="cmr-7">((</span><span 
class="cmbx-7">void</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13022r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13023r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13024r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">printf</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Stage0</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">has</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">got</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">%</span><span 
class="cmr-7">ld</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">)</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13025r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">counter</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13026r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">counter</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">==</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">NUMTASKS</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13027r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13028r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13029r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">counter</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13030r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13031r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage1</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_monode</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13032r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13033r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">((</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">)</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0</span><span 
class="cmr-7">x1</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sends</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">odd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">tasks</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">back</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13034r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_send</span><span 
class="cmr-7">_out</span><span 
class="cmr-7">_to</span><span 
class="cmr-7">(</span><span 
class="cmr-7">task</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13035r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">else</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_send</span><span 
class="cmr-7">_out</span><span 
class="cmr-7">_to</span><span 
class="cmr-7">(</span><span 
class="cmr-7">task</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13036r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13037r37"></a><span 
class="cmr-7">37</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13038r38"></a><span 
class="cmr-7">38</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13039r39"></a><span 
class="cmr-7">39</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage2</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_monode</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13040r40"></a><span 
class="cmr-7">40</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13041r41"></a><span 
class="cmr-7">41</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sends</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">back</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">even</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">tasks</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">less</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">than</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">...</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13042r42"></a><span 
class="cmr-7">42</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">((</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">)</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">NUMTASKS</span><span 
class="cmr-7">/2)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13043r43"></a><span 
class="cmr-7">43</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_send</span><span 
class="cmr-7">_out</span><span 
class="cmr-7">_to</span><span 
class="cmr-7">(</span><span 
class="cmr-7">task</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13044r44"></a><span 
class="cmr-7">44</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">else</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_send</span><span 
class="cmr-7">_out</span><span 
class="cmr-7">_to</span><span 
class="cmr-7">(</span><span 
class="cmr-7">task</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13045r45"></a><span 
class="cmr-7">45</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13046r46"></a><span 
class="cmr-7">46</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13047r47"></a><span 
class="cmr-7">47</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13048r48"></a><span 
class="cmr-7">48</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage3</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13049r49"></a><span 
class="cmr-7">49</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13050r50"></a><span 
class="cmr-7">50</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(((</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">)</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x02DC;0</span><span 
class="cmr-7">x1</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;&amp;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">)</span><span 
class="cmr-7">task</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">NUMTASKS</span><span 
class="cmr-7">/2)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13051r51"></a><span 
class="cmr-7">51</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13052r52"></a><span 
class="cmr-7">52</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13053r53"></a><span 
class="cmr-7">53</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13054r54"></a><span 
class="cmr-7">54</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13055r55"></a><span 
class="cmr-7">55</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage0</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">s0</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage1</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">s1</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage2</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">s2</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage3</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">s3</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13056r56"></a><span 
class="cmr-7">56</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe1</span><span 
class="cmr-7">(&amp;</span><span 
class="cmr-7">s0</span><span 
class="cmr-7">,&amp;</span><span 
class="cmr-7">s1</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13057r57"></a><span 
class="cmr-7">57</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe1</span><span 
class="cmr-7">.</span><span 
class="cmr-7">wrap</span><span 
class="cmr-7">_around</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13058r58"></a><span 
class="cmr-7">58</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe2</span><span 
class="cmr-7">(&amp;</span><span 
class="cmr-7">pipe1</span><span 
class="cmr-7">,&amp;</span><span 
class="cmr-7">s2</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13059r59"></a><span 
class="cmr-7">59</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe2</span><span 
class="cmr-7">.</span><span 
class="cmr-7">wrap</span><span 
class="cmr-7">_around</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13060r60"></a><span 
class="cmr-7">60</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">(&amp;</span><span 
class="cmr-7">pipe2</span><span 
class="cmr-7">,&amp;</span><span 
class="cmr-7">s3</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13061r61"></a><span 
class="cmr-7">61</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">wrap</span><span 
class="cmr-7">_around</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13062r62"></a><span 
class="cmr-7">62</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13063r63"></a><span 
class="cmr-7">63</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-13064r64"></a><span 
class="cmr-7">64</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 479--><p class="indent" >   To create a loopback channel we have used the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">wrap_around</span></span></span> method available
in both the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_pipe</span></span></span> and the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_farm</span></span></span> skeletons. More details on <span 
class="cmti-10">feedback channels</span>
in Sec.&#x00A0;<a 
href="#x1-220003.5">3.5<!--tex4ht:ref: sec:ff:feedback --></a>.
<!--l. 485--><p class="indent" >   <hr class="figure"><div class="figure" 
>
                                                                  

                                                                  
<a 
 id="x1-130653"></a>
                                                                  

                                                                  
<div  
class="centerline"><img 
src="tutorial9x.png" alt="PIC" class="graphics" width="327.74895pt" height="81.46408pt" ><!--tex4ht:graphics  
name="tutorial9x.png" src="figures/ff_farm.eps"  
--></div>
<br /> <div class="caption" 
><span class="id">Figure&#x00A0;3.3: </span><span  
class="content">Possible <span 
class="cmti-10">farms </span>and <span 
class="cmti-10">farms</span>+<span 
class="cmti-10">feedback</span> <span 
class="cmss-10">FastFlow</span> skeleton versions.</span></div><!--tex4ht:tlabel?: x1-130653 -->
                                                                  

                                                                  
<!--l. 489--><p class="indent" >   </div><hr class="endfigure">
   <h4 class="subsectionHead"><span class="titlemark">3.2.4   </span> <a 
 id="x1-140003.2.4"></a><span 
class="cmti-10">ff</span><span 
class="cmti-10">_farm</span></h4>
<!--l. 494--><p class="noindent" >Here we introduce the other primitive skeleton provided in <span 
class="cmss-10">FastFlow</span>, namely the
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_farm</span></span></span> skeleton.
<!--l. 497--><p class="indent" >   The standard way to create a <span 
class="cmti-10">task-farm </span>skeleton with <span 
class="cmmi-10">n </span>workers is to create <span 
class="cmmi-10">n</span>
distinct <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> objects (workers node), pack them in a <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">std::vector</span></span></span> and then
pass the vector to the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_farm</span></span></span> constructor. Let&#8217;s have a look at the following &#8221;hello
world&#8221;-like program: <!--l. 501-->
<div class="lstlisting" id="listing-9"><span class="tlabel"><a 
 id="x1-14001r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">****************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14002r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">hello</span><span 
class="cmr-7">_farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14003r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14004r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14005r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14006r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14007r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Worker</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14008r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14009r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Hello</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">I</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">worker</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">get</span><span 
class="cmr-7">_my</span><span 
class="cmr-7">_id</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14010r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">t</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14011r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14012r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14013r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[])</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14014r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14015r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[1])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14016r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14017r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">;++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Worker</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14018r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_farm</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myFarm</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14019r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">myFarm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myFarm</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14020r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14021r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 524--><p class="indent" >   This code basically defines a farm with <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">nworkers</span></span></span> workers processing data items
appearing onto the farm input stream and delivering results onto the farm output
stream. The default scheduling policy used to send input tasks to workers is the
&#8221;pseudo round-robin one&#8221; (see Sec.&#x00A0;<a 
href="#x1-170003.3">3.3<!--tex4ht:ref: sec:ff:scheduling --></a>). Workers are implemented by the
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">Worker</span></span></span> objects. These objects may represent sequential concurrent activities
as well as further skeletons, that is either pipeline or farm instances. The
above defined farm <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">myFarm</span></span></span> has the default Emitter (or scheduler) and the
default Collector (or gatherer) implemented as separate concurrent activity. To
execute the farm synchronously, the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">run_and_wait_end()</span></span></span> method is
used.
<!--l. 535--><p class="indent" >   Compiling and running the above code we have: <!--l. 536-->
<div class="lstlisting" id="listing-10"><span class="tlabel"><a 
 id="x1-14022r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">ffsrc$</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">g</span><span 
class="cmr-7">++</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">std</span><span 
class="cmr-7">=</span><span 
class="cmr-7">c</span><span 
class="cmr-7">++11</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">I$FF</span><span 
class="cmr-7">_ROOT</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">hello</span><span 
class="cmr-7">_farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">o</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">hello</span><span 
class="cmr-7">_farm</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">pthread</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14023r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">ffsrc$</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">./</span><span 
class="cmr-7">hello</span><span 
class="cmr-7">_farm</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">3</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14024r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">Hello</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">I</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">worker</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14025r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmr-7">Hello</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">I</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">worker</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14026r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmr-7">Hello</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">I</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">worker</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span>
   </div>
<!--l. 543--><p class="indent" >   As you can see, the workers are activated only once because there is no input
stream. The only way to provide an input stream to a <span 
class="cmss-10">FastFlow</span> streaming network
is to have the first component in the network generating a stream or by
reading a &#8221;real&#8221; input stream. To this end, we may for example use the farm
described above as a second stage of a pipeline skeleton whose first stage
generates the stream and the last stage just writes the results on the screen:
<!--l. 550-->
<div class="lstlisting" id="listing-11"><span class="tlabel"><a 
 id="x1-14027r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14028r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">hello</span><span 
class="cmr-7">_farm2</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14029r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14030r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14031r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">define</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">HAS</span><span 
class="cmr-7">_CXX11</span><span 
class="cmr-7">_VARIADIC</span><span 
class="cmr-7">_TEMPLATES</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">needed</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">use</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14032r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">pipeline</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14033r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14034r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14035r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Worker</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14036r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">_init</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14037r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Hello</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">I</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">worker</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">get</span><span 
class="cmr-7">_my</span><span 
class="cmr-7">_id</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14038r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14039r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14040r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14041r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">t</span><span 
class="cmr-7">;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">just</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sends</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">out</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">tasks</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14042r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14043r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14044r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">firstStage</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14045r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">size</span><span 
class="cmr-7">=10;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14046r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14047r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">size</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14048r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_send</span><span 
class="cmr-7">_out</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">(</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sends</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">out</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14049r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14050r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14051r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">streamGenerator</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14052r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">lastStage</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14053r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14054r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14055r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Last</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">received</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14056r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14057r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">this</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">means</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8216;&#8216;</span><span 
class="cmr-7">no</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">send</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">out</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">let</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">go</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">on</span><span 
class="cmr-7">...&#8217;&#8217;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14058r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14059r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">streamDrainer</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14060r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[])</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14061r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14062r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[1])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14063r37"></a><span 
class="cmr-7">37</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14064r38"></a><span 
class="cmr-7">38</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">;++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Worker</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14065r39"></a><span 
class="cmr-7">39</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">(&amp;</span><span 
class="cmr-7">streamGenerator</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14066r40"></a><span 
class="cmr-7">40</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_farm</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14067r41"></a><span 
class="cmr-7">41</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">streamDrainer</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14068r42"></a><span 
class="cmr-7">42</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14069r43"></a><span 
class="cmr-7">43</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14070r44"></a><span 
class="cmr-7">44</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 597--><p class="indent" >   In some cases, could be convinient to create a task-farm just from a single
function (i.e. withouth defining the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span>). Provided that the function has a
proper signature, i.e. <span 
class="pcrr7t-">T&#x22C6;(&#x22C6;F)(T&#x22C6;,ff</span><span 
class="pcrr7t-">_node&#x22C6;const)</span>, a very simple way to
instanciate a farm is to pass the function and the number of workers you want to use
(replication degree) in the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_farm</span></span></span> construct, as in the following sketch of code:
<!--l. 602-->
<div class="lstlisting" id="listing-12"><span class="tlabel"><a 
 id="x1-14071r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">define</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">HAS</span><span 
class="cmr-7">_CXX11</span><span 
class="cmr-7">_VARIADIC</span><span 
class="cmr-7">_TEMPLATES</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14072r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14073r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14074r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myTask</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">....</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">this</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">my</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">input</span><span 
class="cmr-7">/</span><span 
class="cmr-7">output</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">type</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14075r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14076r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmr-7">myTask</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">F</span><span 
class="cmr-7">(</span><span 
class="cmr-7">myTask</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">in</span><span 
class="cmr-7">,</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">...</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-14077r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_farm</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">(</span><span 
class="cmr-7">F</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">3)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">creates</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">a</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executing</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">3</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">replicas</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">of</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">F</span>
   </div>
                                                                  

                                                                  
<!--l. 613--><p class="noindent" >
   <h5 class="subsubsectionHead"><a 
 id="x1-150003.2.4"></a>Defining Emitter and Collector in a farm</h5>
<!--l. 614--><p class="noindent" >Both <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">emitter</span></span></span> and <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">collector</span></span></span> must be supplied as <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> to the farm
constructor. Considering the farm skeleton as a particular case of a a 3-stage pipeline
(the first stage and the last stage are the Emitter and the Collector, respectively) we
now want to re-write the previous example using only the <span 
class="cmss-10">FastFlow</span> farm skeleton:
<!--l. 622-->
<div class="lstlisting" id="listing-13"><span class="tlabel"><a 
 id="x1-15001r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15002r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">hello</span><span 
class="cmr-7">_farm3</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15003r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15004r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15005r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">define</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">HAS</span><span 
class="cmr-7">_CXX11</span><span 
class="cmr-7">_VARIADIC</span><span 
class="cmr-7">_TEMPLATES</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">needed</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">use</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15006r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">pipeline</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15007r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15008r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15009r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Worker</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15010r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">_init</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15011r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Hello</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">I</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">worker</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">get</span><span 
class="cmr-7">_my</span><span 
class="cmr-7">_id</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15012r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15013r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15014r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15015r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">t</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">just</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sends</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">out</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">tasks</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15016r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15017r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15018r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">firstStage</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15019r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">size</span><span 
class="cmr-7">=10;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15020r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15021r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">size</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15022r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_send</span><span 
class="cmr-7">_out</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">(</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15023r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15024r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15025r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Emitter</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15026r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">lastStage</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15027r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15028r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15029r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Last</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">received</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15030r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15031r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15032r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15033r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Collector</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15034r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[])</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15035r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15036r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[1])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15037r37"></a><span 
class="cmr-7">37</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15038r38"></a><span 
class="cmr-7">38</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">;++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Worker</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15039r39"></a><span 
class="cmr-7">39</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_farm</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">Emitter</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">Collector</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15040r40"></a><span 
class="cmr-7">40</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15041r41"></a><span 
class="cmr-7">41</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-15042r42"></a><span 
class="cmr-7">42</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 666--><p class="noindent" >The Emitter node encapsulates user&#8217;s code provided in the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">svc</span></span></span> method and the task
scheduling policy which defines how tasks will be sent to workers. In the same way,
the Collector node encapsulates the user&#8217;s code and the task gathering policy defining
how tasks have to be collected from the workers.
<!--l. 674--><p class="indent" >   It is possible to redefine both scheduling and gathering policies of the <span 
class="cmss-10">FastFlow</span>
farm skeleton, please refer to to <span class="cite">[<a 
href="#X13:ff:tutorial:CEFP">16</a>]</span>.
<!--l. 677--><p class="noindent" >
   <h5 class="subsubsectionHead"><a 
 id="x1-160003.2.4"></a>Farm with no Collector</h5>
<!--l. 679--><p class="noindent" >We consider now a further case: a farm with the Emitter but without the Collector.
Having no collector the farm&#8217;s workers may either consolidates the results in the
main memory or send them to the next stage (in case the farm is a pipeline
stage) provided that the next stage is defined as <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_minode</span></span></span> (i.e. multi-input
node).
<!--l. 685--><p class="indent" >   It is possible to remove the collector from the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_farm</span></span></span> by calling the method
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">remove_collector</span></span></span>. Let&#8217;s see a simple example implementing the above case:
<!--l. 688-->
<div class="lstlisting" id="listing-14"><span class="tlabel"><a 
 id="x1-16001r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16002r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">hello</span><span 
class="cmr-7">_farm4</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16003r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16004r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16005r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-|</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16006r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Hello</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">I</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">worker</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">get</span><span 
class="cmr-7">_my</span><span 
class="cmr-7">_id</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16024r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16025r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16026r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">t</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">it</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">does</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nothing</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">just</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sends</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">out</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">tasks</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16027r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16028r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">firstStage</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16029r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">size</span><span 
class="cmr-7">=10;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16030r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16031r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">size</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16032r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_send</span><span 
class="cmr-7">_out</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">(</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sends</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">into</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">output</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">channel</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16033r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16034r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16035r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Emitter</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16036r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">lastStage</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_minode</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">NOTE</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">multi</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">input</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16037r37"></a><span 
class="cmr-7">37</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16038r38"></a><span 
class="cmr-7">38</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16039r39"></a><span 
class="cmr-7">39</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Last</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">received</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16040r40"></a><span 
class="cmr-7">40</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">from</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">get</span><span 
class="cmr-7">_channel</span><span 
class="cmr-7">_id</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16041r41"></a><span 
class="cmr-7">41</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16042r42"></a><span 
class="cmr-7">42</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16043r43"></a><span 
class="cmr-7">43</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16044r44"></a><span 
class="cmr-7">44</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">LastStage</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16045r45"></a><span 
class="cmr-7">45</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[])</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16046r46"></a><span 
class="cmr-7">46</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16047r47"></a><span 
class="cmr-7">47</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[1])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16048r48"></a><span 
class="cmr-7">48</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16049r49"></a><span 
class="cmr-7">49</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">;++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Worker</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16050r50"></a><span 
class="cmr-7">50</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_farm</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">Emitter</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16051r51"></a><span 
class="cmr-7">51</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">remove</span><span 
class="cmr-7">_collector</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">this</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">removes</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">default</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">collector</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16052r52"></a><span 
class="cmr-7">52</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">(&amp;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">LastStage</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16053r53"></a><span 
class="cmr-7">53</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16054r54"></a><span 
class="cmr-7">54</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-16055r55"></a><span 
class="cmr-7">55</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 747--><p class="noindent" >
   <h3 class="sectionHead"><span class="titlemark">3.3   </span> <a 
 id="x1-170003.3"></a>Tasks scheduling</h3>
<!--l. 750--><p class="noindent" >
   <h5 class="likesubsubsectionHead"><a 
 id="x1-180003.3"></a>Sending tasks to specific farm workers</h5>
<!--l. 752--><p class="noindent" >In order to select the worker where an incoming input task has to be directed, the
<span 
class="cmss-10">FastFlow</span> farm uses an internal <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_loadbalancer</span></span></span> that provides a method
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">int</span><span 
class="pcrr7t-">&#x00A0;selectworker()</span></span></span> returning the index in the worker array corresponding to
the worker where the next task has to be directed. The programmer may subclass the
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_loadbalancer</span></span></span> and provide his own <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">selectworker()</span></span></span> method and then pass
the new load balancer to the farm emitter, therefore implementing a farm with a user
                                                                  

                                                                  
defined scheduling policy. To understand how to do this, please refer to
<span class="cite">[<a 
href="#X13:ff:tutorial:CEFP">16</a>]</span>.
<!--l. 761--><p class="indent" >   Another simpler option for scheduling tasks directly in the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">svc</span></span></span> method of the
farm emitter is to use the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_send_out_to</span></span></span> method of the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_loadbalancer</span></span></span>
class. In this case what is needed is to pass the default load balancer object to the
emitter thread and to use the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_loadbalancer::ff_send_out_to</span></span></span> method
instead of <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node::ff_send_out</span></span></span> method for sending out tasks.
<!--l. 767--><p class="indent" >   Let&#8217;s see a simple example showing how to send the first and last task to a
specific workers (worker 0).
   <!--l. 770-->
<div class="lstlisting" id="listing-15"><span class="tlabel"><a 
 id="x1-18001r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">********************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18002r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_send</span><span 
class="cmr-7">_out</span><span 
class="cmr-7">_to</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18003r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18004r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18005r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18006r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18007r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Worker</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18008r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18009r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18010r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Worker</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">get</span><span 
class="cmr-7">_my</span><span 
class="cmr-7">_id</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18011r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">has</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">got</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18012r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18013r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18014r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18015r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Emitter</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18016r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Emitter</span><span 
class="cmr-7">(</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_loadbalancer</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">lb</span><span 
class="cmr-7">)</span><span 
class="cmr-7">:</span><span 
class="cmr-7">lb</span><span 
class="cmr-7">(</span><span 
class="cmr-7">lb</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18017r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_loadbalancer</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">lb</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18018r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">size</span><span 
class="cmr-7">=10;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18019r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18020r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">size</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18021r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">i</span><span 
class="cmr-7">==0</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">||</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">==</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">size</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18022r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">lb</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_send</span><span 
class="cmr-7">_out</span><span 
class="cmr-7">_to</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">(</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18023r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">else</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18024r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_send</span><span 
class="cmr-7">_out</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">(</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18025r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18026r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18027r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18028r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18029r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[])</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18030r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18031r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[1])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18032r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18033r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">;++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Worker</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18034r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_farm</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18035r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Emitter</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">E</span><span 
class="cmr-7">(</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">getlb</span><span 
class="cmr-7">()</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18036r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">add</span><span 
class="cmr-7">_emitter</span><span 
class="cmr-7">(&amp;</span><span 
class="cmr-7">E</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">add</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">specialized</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">emitter</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18037r37"></a><span 
class="cmr-7">37</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">remove</span><span 
class="cmr-7">_collector</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">this</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">removes</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">default</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">collector</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18038r38"></a><span 
class="cmr-7">38</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18039r39"></a><span 
class="cmr-7">39</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-18040r40"></a><span 
class="cmr-7">40</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 813--><p class="noindent" >
   <h5 class="likesubsubsectionHead"><a 
 id="x1-190003.3"></a>Broadcasting a task to all workers</h5>
<!--l. 815--><p class="noindent" ><span 
class="cmss-10">FastFlow</span> supports the possibility to direct a task to all the workers in the farm. It is
particularly useful if we want to process the task by workers implementing different
functions (so called MISD farm). The broadcasting is achieved calling the
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">broadcast_task</span></span></span> method of the farm <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_loadbalancer</span></span></span> object, in a very similar
way to what we have already seen for the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_send_out_to</span></span></span> method in the previous
section.
<!--l. 823--><p class="indent" >   In the following a simple example. <!--l. 824-->
<div class="lstlisting" id="listing-16"><span class="tlabel"><a 
 id="x1-19001r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">***************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19002r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">_misd</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19003r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19004r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19005r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19006r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19007r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">WorkerA</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19008r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19009r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19010r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">WorkerA</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">has</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">got</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19011r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">t</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19012r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19013r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19014r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">WorkerB</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19015r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19016r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19017r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">WorkerB</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">has</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">got</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19018r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">t</span><span 
class="cmr-7">;;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19019r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19020r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19021r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Emitter</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19022r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Emitter</span><span 
class="cmr-7">(</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_loadbalancer</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">lb</span><span 
class="cmr-7">)</span><span 
class="cmr-7">:</span><span 
class="cmr-7">lb</span><span 
class="cmr-7">(</span><span 
class="cmr-7">lb</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19023r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_loadbalancer</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">lb</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19024r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">size</span><span 
class="cmr-7">=10;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19025r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19026r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">size</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19027r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">lb</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">broadcast</span><span 
class="cmr-7">_task</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">(</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19028r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19029r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19030r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19031r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">lastStage</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19032r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19033r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19034r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19035r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19036r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Collector</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19037r37"></a><span 
class="cmr-7">37</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[])</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19038r38"></a><span 
class="cmr-7">38</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19039r39"></a><span 
class="cmr-7">39</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[1])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19040r40"></a><span 
class="cmr-7">40</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">nworkers</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">=2)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19041r41"></a><span 
class="cmr-7">41</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19042r42"></a><span 
class="cmr-7">42</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">/2;++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">WorkerA</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19043r43"></a><span 
class="cmr-7">43</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">/2;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">;++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">WorkerB</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19044r44"></a><span 
class="cmr-7">44</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_farm</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">,</span><span 
class="cmr-7">nullptr</span><span 
class="cmr-7">,&amp;</span><span 
class="cmr-7">Collector</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19045r45"></a><span 
class="cmr-7">45</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Emitter</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">E</span><span 
class="cmr-7">(</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">getlb</span><span 
class="cmr-7">()</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19046r46"></a><span 
class="cmr-7">46</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">add</span><span 
class="cmr-7">_emitter</span><span 
class="cmr-7">(&amp;</span><span 
class="cmr-7">E</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">add</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">specialized</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">emitter</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19047r47"></a><span 
class="cmr-7">47</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">remove</span><span 
class="cmr-7">_collector</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">this</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">removes</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">default</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">collector</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19048r48"></a><span 
class="cmr-7">48</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19049r49"></a><span 
class="cmr-7">49</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-19050r50"></a><span 
class="cmr-7">50</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 877--><p class="noindent" >
   <h5 class="likesubsubsectionHead"><a 
 id="x1-200003.3"></a>Using auto-scheduling</h5>
<!--l. 879--><p class="noindent" >The default <span 
class="cmti-10">farm </span>scheduling policy is &#8221;loosely round-robin&#8221; (or pseudo round-robin)
meaning that the Emitter try to send the task in a round-robin fashion,
but in case one of the workers&#8217; input queue is full, the Emitter does not
wait till it can insert the task in the queue, but jumps to the next worker
until the task can be inserted in one of the queues. This is a very simple
policy but it doesn&#8217;t work well if the tasks have very different execution
costs.
<!--l. 885--><p class="indent" >   <span 
class="cmss-10">FastFlow</span> provides a suitable way to define a task-farm skeleton with the
&#8221;auto-scheduling&#8221; policy. When using such policy, the workers &#8221;ask&#8221; for a task to be
computed rather than (passively) accepting tasks sent by the emitter (explicit or
implicit) according to some scheduling policy. This scheduling behaviour may be
simply implemented by using the method <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">set_scheduling_ondemand()</span></span></span> of the
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_farm</span></span></span> class, as in the following: <!--l. 890-->
<div class="lstlisting" id="listing-17"><span class="tlabel"><a 
 id="x1-20001r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_farm</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myFarm</span><span 
class="cmr-7">(...)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-20002r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">myFarm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">set</span><span 
class="cmr-7">_scheduling</span><span 
class="cmr-7">_ondemand</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-20003r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">...</span>
                                                                  

                                                                  
   </div>
<!--l. 896--><p class="indent" >   It is worth to remark that, this policy is able to ensure quite good load balancing
property when the tasks to be computed exhibit different computational costs and up
to the point when the Emitter does not become a bottleneck.
<!--l. 900--><p class="indent" >   It is possible to increase the asynchrony level of the &#8221;request-reply&#8221; protocol
between workers and Emitter simply by passing an integer value grater than zero to
the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">set_scheduling_ondemand()</span></span></span> function. By default the asynchrony level is
1.
<!--l. 905--><p class="noindent" >
   <h3 class="sectionHead"><span class="titlemark">3.4   </span> <a 
 id="x1-210003.4"></a>Tasks ordering</h3>
<!--l. 908--><p class="noindent" >Tasks passing through a task-farm can be subjected to reordering because of different
execution times in the worker threads. To overcome the problem of sending packets in
a different order with respect to input, tasks can be reordered by the Collector. This
solution might introduce extra latency mainly because reordering checks have to be
executed even in the case packets already arrive at the farm Collector in the correct
order.
<!--l. 915--><p class="indent" >   The default round-robin and auto scheduling policies are not order preserving, for
this reason a specialised version of the <span 
class="cmss-10">FastFlow</span> farm has been introduced which
enforce the ordering of the packets.
<!--l. 919--><p class="indent" >   The <span 
class="cmti-10">ordered farm </span>may be introduced by using the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_ofarm</span></span></span> skeleton.<br 
class="newline" /><span 
class="cmbx-10">TBD: put an example here</span>
<!--l. 924--><p class="noindent" >
   <h3 class="sectionHead"><span class="titlemark">3.5   </span> <a 
 id="x1-220003.5"></a>Feedback channels</h3>
<!--l. 927--><p class="noindent" >There are cases where it is useful to have the possibility to route back some results to
the streaming network input stream for further computation. For example, this
possibility may be exploited to implement the divide&amp;conquer pattern using the
task-farm.
<!--l. 932--><p class="indent" >   The feedback channel in a farm or pipeline may be introduced by the
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">wrap_around</span></span></span> method on the interested skeleton. As an example, in the following
code it is implemented a task-farm with default Emitter and Collector and with a
feedback channel between the Collector and the Emitter: <!--l. 937-->
<div class="lstlisting" id="listing-18"><span class="tlabel"><a 
 id="x1-22001r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">Emitter</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myEmitter</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22002r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">Collector</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myCollector</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22003r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_farm</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myFarm</span><span 
class="cmr-7">(</span><span 
class="cmr-7">W</span><span 
class="cmr-7">,&amp;</span><span 
class="cmr-7">myEmitter</span><span 
class="cmr-7">,&amp;</span><span 
class="cmr-7">myCollector</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22004r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmr-7">myFarm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">wrap</span><span 
class="cmr-7">_aroud</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22005r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmr-7">...</span>
   </div>
<!--l. 944--><p class="indent" >   Starting with <span 
class="cmss-10">FastFlow</span> version 2.0.0, it is possible to use feedback channels not
only at the outermost skeleton level. As an example, in the following we provide the
code needed to create a 2-stage pipeline where the second stage is a farm
without Collector and a feedback channel between each worker and the farm
Emitter:
   <!--l. 949-->
                                                                  

                                                                  
<div class="lstlisting" id="listing-19"><span class="tlabel"><a 
 id="x1-22006r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22007r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">feedback</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22008r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22009r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22010r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22011r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22012r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">F</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22013r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">v</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">.</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22014r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage0</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Sched</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">.</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22015r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x02C6;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">.</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22016r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">F</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22017r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmsy-7">|</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22018r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
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class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22019r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22020r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">define</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">HAS</span><span 
class="cmr-7">_CXX11</span><span 
class="cmr-7">_VARIADIC</span><span 
class="cmr-7">_TEMPLATES</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22021r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22022r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">pipeline</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22023r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22024r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">streamlength</span><span 
class="cmr-7">=20;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22025r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmbx-7">typedef</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">function</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">,</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">)</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">fffarm</span><span 
class="cmr-7">_f</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22026r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">F</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">in</span><span 
class="cmr-7">,</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22027r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmsy-7">*</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">in</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22028r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22029r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22030r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Sched</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22031r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Sched</span><span 
class="cmr-7">(</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_loadbalancer</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">lb</span><span 
class="cmr-7">)</span><span 
class="cmr-7">:</span><span 
class="cmr-7">lb</span><span 
class="cmr-7">(</span><span 
class="cmr-7">lb</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22032r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22033r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22034r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">channel</span><span 
class="cmr-7">=</span><span 
class="cmr-7">lb</span><span 
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class="cmmi-7">&#x003E;</span><span 
class="cmr-7">get</span><span 
class="cmr-7">_channel</span><span 
class="cmr-7">_id</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22035r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">channel</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">==</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22036r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">coming</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">from</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage0</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22037r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">t</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22038r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22039r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">coming</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">from</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Worker</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">channel</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22040r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22041r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22042r37"></a><span 
class="cmr-7">37</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">eosnotify</span><span 
class="cmr-7">(</span><span 
class="cmr-7">ssize</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22043r38"></a><span 
class="cmr-7">38</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">received</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">from</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Stage0</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">broadcast</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">all</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">workers</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22044r39"></a><span 
class="cmr-7">39</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">lb</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">broadcast</span><span 
class="cmr-7">_task</span><span 
class="cmr-7">(</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22045r40"></a><span 
class="cmr-7">40</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22046r41"></a><span 
class="cmr-7">41</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_loadbalancer</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">lb</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22047r42"></a><span 
class="cmr-7">42</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22048r43"></a><span 
class="cmr-7">43</span></span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">Stage0</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22049r44"></a><span 
class="cmr-7">44</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">streamlength</span><span 
class="cmr-7">;++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22050r45"></a><span 
class="cmr-7">45</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_send</span><span 
class="cmr-7">_out</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">(</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22051r46"></a><span 
class="cmr-7">46</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22052r47"></a><span 
class="cmr-7">47</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22053r48"></a><span 
class="cmr-7">48</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22054r49"></a><span 
class="cmr-7">49</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_farm</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">((</span><span 
class="cmr-7">fffarm</span><span 
class="cmr-7">_f</span><span 
class="cmr-7">)</span><span 
class="cmr-7">F</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">3)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22055r50"></a><span 
class="cmr-7">50</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">remove</span><span 
class="cmr-7">_collector</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">removes</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">default</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">collector</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22056r51"></a><span 
class="cmr-7">51</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">scheduler</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">gets</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">input</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">internal</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">load</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">balancer</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22057r52"></a><span 
class="cmr-7">52</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">add</span><span 
class="cmr-7">_emitter</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Sched</span><span 
class="cmr-7">(</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">getlb</span><span 
class="cmr-7">()</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22058r53"></a><span 
class="cmr-7">53</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">adds</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">feedback</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">channels</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">between</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">each</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">worker</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">and</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">scheduler</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22059r54"></a><span 
class="cmr-7">54</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">wrap</span><span 
class="cmr-7">_around</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22060r55"></a><span 
class="cmr-7">55</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">creates</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipeline</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22061r56"></a><span 
class="cmr-7">56</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Stage0</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22062r57"></a><span 
class="cmr-7">57</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22063r58"></a><span 
class="cmr-7">58</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-22064r59"></a><span 
class="cmr-7">59</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 1011--><p class="noindent" >In this case the Emitter node of the farm receives tasks both from the first
stage of the pipeline and from farm&#8217;s workers. To discern different inputs
it is used the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_get_channel_id</span></span></span> method of the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_loadbalancer</span></span></span>
object: inputs coming from workers have channel id greater than 0 (the
channel id correspond to the worker id). The Emitter non-deterministic way
processes input tasks giving higher priority to the tasks coming back from
workers.
<!--l. 1020--><p class="indent" >   It is important to note how EOS propagation works in presence of loopback
channels. Normally, the EOS is automatically propagated onward by the <span 
class="cmss-10">FastFlow</span>
run-time in order to implement pipeline-like termination. When internal loopback
channels are present in the skeleton tree (and in general when there is multi-input
nodes), the EOS is propagated only if the EOS message has been received from all
input channels. In this case is useful to be notified when an EOS is received so that
the termination can be controlled by the programmer. In the proposed example
above, we want to propagate the EOS as soon as we receive it from the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">Stage0</span></span></span> and
then to terminate the execution only after having received all EOS from all
workers.
<!--l. 1030--><p class="noindent" >
   <h3 class="sectionHead"><span class="titlemark">3.6   </span> <a 
 id="x1-230003.6"></a>Mixing farms pipelines and feedbacks</h3>
<!--l. 1032--><p class="noindent" ><hr class="figure"><div class="figure" 
>
                                                                  

                                                                  
<a 
 id="x1-230014"></a>
                                                                  

                                                                  
<div  
class="centerline"><img 
src="tutorial10x.png" alt="PIC" class="graphics" width="377.40424pt" height="222.02611pt" ><!--tex4ht:graphics  
name="tutorial10x.png" src="figures/composition.eps"  
--></div>
<br /> <div class="caption" 
><span class="id">Figure&#x00A0;3.4: </span><span  
class="content"><span 
class="cmss-10">FastFlow</span>&#8217;s core patterns may be almost arbitrary composed</span></div><!--tex4ht:tlabel?: x1-230014 -->
                                                                  

                                                                  
<!--l. 1036--><p class="noindent" ></div><hr class="endfigure">
<!--l. 1038--><p class="indent" >   <span 
class="cmss-10">FastFlow</span> <span 
class="cmti-10">pipeline</span>, <span 
class="cmti-10">task-farm </span>skeletons and the <span 
class="cmti-10">feedback </span>pattern modifier can be
nested and combined in many different ways. Figure&#x00A0;<a 
href="#x1-230014">3.4<!--tex4ht:ref: fig:ff:composition --></a> sketches some of the
possible combinations that can be realised in a easy way.
   <h3 class="sectionHead"><span class="titlemark">3.7   </span> <a 
 id="x1-240003.7"></a>Software accelerators</h3>
<!--l. 1046--><p class="noindent" ><span 
class="cmss-10">FastFlow</span> can be used to accelerate existing sequential code without the need of
completely restructuring the entire application using algorithmic skeletons. In a
nutshell, programmers may identify potentially concurrent tasks within the sequential
code and request their execution from an appropriate <span 
class="cmss-10">FastFlow</span> pattern on the
fly.
<!--l. 1051--><p class="indent" >   By analogy with what happens with GPGPUs and FPGAs used to support
computations on the main processing unit, the cores used to run the user defined
tasks through <span 
class="cmss-10">FastFlow</span> define a software &#8221;accelerator&#8221; device. This device will run on
the &#8221;spare&#8221; cores available. <span 
class="cmss-10">FastFlow</span> accelerator is a &#8221;software device&#8221; that can be
used to speedup portions of code using the cores left unused by the main application.
From a more formal perspective, a <span 
class="cmss-10">FastFlow</span> accelerator is defined by a skeletal
composition augmented with an input and an output stream that can be,
respectively, pushed and popped from outside the accelerator. Both the functional
and extra-functional behaviour of the accelerator is fully determined by the chosen
skeletal composition.
<!--l. 1061--><p class="indent" >   <hr class="figure"><div class="figure" 
>
                                                                  

                                                                  
<a 
 id="x1-240015"></a>
                                                                  

                                                                  
<div  
class="centerline"><img 
src="tutorial11x.png" alt="PIC" class="graphics" width="319.18762pt" height="214.79921pt" ><!--tex4ht:graphics  
name="tutorial11x.png" src="figures/self_offloading.eps"  
--></div>
<br /> <div class="caption" 
><span class="id">Figure&#x00A0;3.5: </span><span  
class="content"><span 
class="cmss-10">FastFlow</span> software accelerator conceptual design</span></div><!--tex4ht:tlabel?: x1-240015 -->
                                                                  

                                                                  
<!--l. 1065--><p class="indent" >   </div><hr class="endfigure">
<!--l. 1067--><p class="indent" >   Using <span 
class="cmss-10">FastFlow</span> accelerator mode is not that different from using <span 
class="cmss-10">FastFlow</span> to write
an application only using skeletons (see Fig.&#x00A0;<a 
href="#x1-240015">3.5<!--tex4ht:ref: fig:ff:accel --></a>). The skeletons must be
started as a software accelerator, and tasks have to be offloaded from the main
program. A simple program using the <span 
class="cmss-10">FastFlow</span> accelerator mode is shown below:
<!--l. 1072-->
<div class="lstlisting" id="listing-20"><span class="tlabel"><a 
 id="x1-24002r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24003r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">accelerator</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24004r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24005r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24006r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24007r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24008r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Worker</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24009r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24010r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24011r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pow</span><span 
class="cmr-7">(</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">,3)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24012r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">t</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24013r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24014r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24015r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">(</span><span 
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class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[])</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24016r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">2)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24017r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[1])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24018r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">streamlen</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[2])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24019r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24020r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">;++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Worker</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24021r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">with</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">default</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Emitter</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">and</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Collector</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24022r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_farm</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Workers</span><span 
class="cmr-7">,</span><span 
class="cmr-7">nullptr</span><span 
class="cmr-7">,</span><span 
class="cmr-7">nullptr</span><span 
class="cmr-7">,</span><span 
class="cmbx-7">true</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">accelerator</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">turned</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">on</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24023r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">now</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">run</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">accelator</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">asynchronusly</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24024r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_then</span><span 
class="cmr-7">_freeze</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">can</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">also</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">be</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">used</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">here</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24025r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24026r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">result</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24027r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">streamlen</span><span 
class="cmr-7">;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">++)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24028r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">(</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24029r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">offloaded</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">accelerator</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24030r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">offload</span><span 
class="cmr-7">(</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24031r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24032r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">do</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">something</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">smart</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">here</span><span 
class="cmr-7">...</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24033r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">volatile</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">k</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">k</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">10000;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">k</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24034r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24035r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">try</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">get</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">one</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">result</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">in</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">a</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">non</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">blocking</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">fashion</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24036r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">load</span><span 
class="cmr-7">_result</span><span 
class="cmr-7">_nb</span><span 
class="cmr-7">((</span><span 
class="cmbx-7">void</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">result</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24037r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cerr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">[</span><span 
class="cmr-7">inside</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">for</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">loop</span><span 
class="cmr-7">]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">result</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">result</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24038r37"></a><span 
class="cmr-7">37</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">result</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24039r38"></a><span 
class="cmr-7">38</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24040r39"></a><span 
class="cmr-7">39</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24041r40"></a><span 
class="cmr-7">40</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">offload</span><span 
class="cmr-7">(</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sending</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">End</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">Of</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">Stream</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24042r41"></a><span 
class="cmr-7">41</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">get</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">all</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">remaining</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">results</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">syncronously</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">here</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">also</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24043r42"></a><span 
class="cmr-7">42</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">possible</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">use</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">load</span><span 
class="cmr-7">_result</span><span 
class="cmr-7">_nb</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24044r43"></a><span 
class="cmr-7">43</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">while</span><span 
class="cmr-7">(</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">load</span><span 
class="cmr-7">_result</span><span 
class="cmr-7">((</span><span 
class="cmbx-7">void</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">result</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24045r44"></a><span 
class="cmr-7">44</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cerr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">[</span><span 
class="cmr-7">outside</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">for</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">loop</span><span 
class="cmr-7">]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">result</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">result</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24046r45"></a><span 
class="cmr-7">45</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">result</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24047r46"></a><span 
class="cmr-7">46</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24048r47"></a><span 
class="cmr-7">47</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">wait</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">wait</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">for</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">termination</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24049r48"></a><span 
class="cmr-7">48</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-24050r49"></a><span 
class="cmr-7">49</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 1123--><p class="noindent" >The &#8221;true&#8221; parameter in the farm constructor (the same is for the pipeline) is the
one telling the run-time that the farm (or pipeline) has to be used as an
accelerator. The idea is to start (or re-start) the accelerator and whenever we
have a task ready to be submitted to the accelerator, we simply &#8221;offload&#8221; it
to the accelerator. When we have no more tasks to offload, we send the
End-Of-Stream and eventually we <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">wait</span></span></span> for the completion of the computation of
tasks in the accelerator or, we can <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">wait_freezing</span></span></span> to temporary stop the
accelerator without terminating the threads in order to restart the accelerator
afterwards.
<!--l. 1135--><p class="indent" >   The <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">bool</span><span 
class="pcrr7t-">&#x00A0;load_result(void</span><span 
class="pcrr7t-">&#x00A0;&#x22C6;&#x22C6;)</span></span></span> methods synchronously await for one item
being delivered on the accelerator output stream. If such item is available, the
method returns &#8221;true&#8221; and stores the item pointer in the parameter. If no other
items will be available, the method returns &#8221;false&#8221;. An asynchronous method is also
available with signature <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">bool</span><span 
class="pcrr7t-">&#x00A0;load\_results\_nb(void</span><span 
class="pcrr7t-">&#x00A0;&#x22C6;&#x22C6;)</span></span></span> When the
method is called, if no result is available, it returns &#8221;false&#8221;, and might retry later on
to see whether a result is ready.
   <h3 class="sectionHead"><span class="titlemark">3.8   </span> <a 
 id="x1-250003.8"></a>Examples</h3>
<!--l. 1147--><p class="noindent" ><hr class="figure"><div class="figure" 
>
                                                                  

                                                                  
<a 
 id="x1-250016"></a>
                                                                  

                                                                  
<div  
class="centerline"><img 
src="tutorial12x.png" alt="PIC" class="graphics" width="319.9906pt" height="322.80107pt" ><!--tex4ht:graphics  
name="tutorial12x.png" src="figures/imagesfiltering.eps"  
--></div>
<br /> <div class="caption" 
><span class="id">Figure&#x00A0;3.6: </span><span  
class="content">Different implementations of the image filtering example.</span></div><!--tex4ht:tlabel?: x1-250016 -->
                                                                  

                                                                  
<!--l. 1151--><p class="noindent" ></div><hr class="endfigure">
<!--l. 1153--><p class="indent" >   In this sections we consider an images filtering application in which 2 image filters
have to be applied to a stream of images. We prove different possible <span 
class="cmss-10">FastFlow</span>
implementation using both pipeline and task-farm skeletons. The different
implementations described in the following are sketched in Fig.&#x00A0;<a 
href="#x1-250016">3.6<!--tex4ht:ref: fig:ff:imagesfiltering --></a> (all but
versions <span 
class="cmti-10">img</span><span 
class="cmti-10">_farm2.cpp </span>and <span 
class="cmti-10">img</span><span 
class="cmti-10">_farm3.cpp </span>are reported as source code in this
tutorial): the starting sequential implementation (img.cpp), a 4-stage <span 
class="cmss-10">FastFlow</span>
pipeline implementation (img_pipe.cpp), the same version as before but
the pipeline (3-stage) is implemented as a &#8221;software accelerator&#8221; while the
image reader stage is directly the main program (img_pipe2.cpp), a 4-stage
<span 
class="cmss-10">FastFlow</span> pipeline with the second and third stages implemented as task-farm
skeletons (img_pipe+farm.cpp), a variant of the previous case, i.e. a 3-stage
pipeline whose middle stage is a farm whose workers are 2-stage pipelines
(img_farm+pipe.cpp), and finally the so called &#8221;normal-form&#8221;, i.e. a single task-farm
having the image reader stage collapsed with the farm Emitter and having
the image writer stage collapsed with the farm collector (img_farm.cpp).
The last 2 versions (not reported as source code here), i.e. <span 
class="cmti-10">img</span><span 
class="cmti-10">_farm2.cpp</span>
and <span 
class="cmti-10">img</span><span 
class="cmti-10">_farm3.cpp</span>, are incremental optimizations of the base <span 
class="cmti-10">img</span><span 
class="cmti-10">_farm.cpp</span>
version in which the input and output is performed in parallel in the farm&#8217;s
workers.
   <h4 class="subsectionHead"><span class="titlemark">3.8.1   </span> <a 
 id="x1-260003.8.1"></a>Images filtering</h4>
<!--l. 1171--><p class="noindent" >Let&#8217;s consider a simple streaming application: two image filters (blur and emboss)
have to be applied to a stream of input images. The stream can be of any length and
images of any size (and of different format). For the sake of simplicity images&#8217; file are
stored in a disk directory and the file names are passed as command line arguments
of our simple application. The output images are stored with the same name in a
separate directory.
<!--l. 1176--><p class="indent" >   The application uses the ImageMagick
library<span class="footnote-mark"><a 
href="tutorial5.html#fn3x6"><sup class="textsuperscript">3</sup></a></span><a 
 id="x1-26001f3"></a> 
to manipulate the images and to apply the two filters. In case the ImageMagick
library is not installed, please refer to the &#8221;Install from Source&#8221; instructions
contained in the project web site. This is our starting sequential program:
<!--l. 1180-->
<div class="lstlisting" id="listing-21"><span class="tlabel"><a 
 id="x1-26002r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*********************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26003r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">img</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26004r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26005r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">cassert</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26006r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">iostream</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26007r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">string</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26008r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">algorithm</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26009r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">Magick</span><span 
class="cmr-7">++.</span><span 
class="cmr-7">h</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26010r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Magick</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26011r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26012r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">helping</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">functions</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">it</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">parses</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">command</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">line</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">options</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26013r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmbx-7">char</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">begin</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">end</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">option</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26014r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">itr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">find</span><span 
class="cmr-7">(</span><span 
class="cmr-7">begin</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">end</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">option</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26015r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">itr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">!=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">end</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;&amp;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">itr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">!=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">end</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">itr</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26016r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nullptr</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26017r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26018r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[])</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26019r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1.0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26020r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0.5;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26021r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26022r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cerr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">use</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[0]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">=1.0]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">=.5]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">files</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26023r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26024r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26025r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26026r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">+</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26027r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">+</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26028r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atof</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">+=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26029r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atof</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">+=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26030r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26031r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">InitializeMagick</span><span 
class="cmr-7">(</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26032r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26033r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26034r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26035r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">for</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">each</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">image</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">apply</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">filter</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sequence</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26036r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26037r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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 id="x1-26055r54"></a><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26056r55"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26057r56"></a><span 
class="cmr-7">56</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 1238--><p class="indent" >   Since the two filters may be applied in sequence to independent input images, we
can compute the two filters in pipeline. So we define a 4-stage pipeline: the
first stage read images from the disk, the second and third stages apply the
two filters and the forth stage writes the resulting image into the disk (in a
separate directory). The code for implementing the pipeline is in the following:
                                                                  

                                                                  
<!--l. 1243-->
<div class="lstlisting" id="listing-22"><span class="tlabel"><a 
 id="x1-26058r1"></a><span 
class="cmr-7">1</span></span><span 
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 id="x1-26071r14"></a><span 
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class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">pipeline</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26072r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">Magick</span><span 
class="cmr-7">++.</span><span 
class="cmr-7">h</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26073r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Magick</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26074r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26075r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">this</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">input</span><span 
class="cmr-7">/</span><span 
class="cmr-7">output</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">containing</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">all</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">information</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">needed</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26076r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26077r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Image</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">image</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">name</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">r</span><span 
class="cmr-7">=1.0,</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">s</span><span 
class="cmr-7">=0.5)</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26078r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">image</span><span 
class="cmr-7">(</span><span 
class="cmr-7">image</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">name</span><span 
class="cmr-7">(</span><span 
class="cmr-7">name</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26079r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26080r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Image</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">image</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26081r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">name</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26082r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">,</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26083r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26084r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26085r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmbx-7">char</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">begin</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">end</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">option</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26086r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">itr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">find</span><span 
class="cmr-7">(</span><span 
class="cmr-7">begin</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">end</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">option</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26087r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">itr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">!=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">end</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;&amp;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">itr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">!=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">end</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">itr</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26088r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nullptr</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26089r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26090r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">st</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26091r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Read</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26092r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Read</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">images</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">r</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26093r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">images</span><span 
class="cmr-7">((</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">)</span><span 
class="cmr-7">images</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">(</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26094r37"></a><span 
class="cmr-7">37</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26095r38"></a><span 
class="cmr-7">38</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26096r39"></a><span 
class="cmr-7">39</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26097r40"></a><span 
class="cmr-7">40</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">filepath</span><span 
class="cmr-7">(</span><span 
class="cmr-7">images</span><span 
class="cmr-7">[</span><span 
class="cmr-7">i</span><span 
class="cmr-7">])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26098r41"></a><span 
class="cmr-7">41</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">filename</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26099r42"></a><span 
class="cmr-7">42</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26100r43"></a><span 
class="cmr-7">43</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">only</span><span 
class="cmr-7">&#x00A0;</span><span 
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 id="x1-26101r44"></a><span 
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class="cmr-7">.</span><span 
class="cmr-7">find</span><span 
class="cmr-7">_last</span><span 
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class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
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 id="x1-26102r45"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">n</span><span 
class="cmr-7">+1)</span><span 
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 id="x1-26103r46"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26104r47"></a><span 
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 id="x1-26105r48"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
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class="cmr-7">;;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26106r49"></a><span 
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class="cmr-7">(</span><span 
class="cmr-7">filepath</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26107r50"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">t</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">(</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">filename</span><span 
class="cmr-7">,</span><span 
class="cmr-7">radius</span><span 
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class="cmr-7">sigma</span><span 
class="cmr-7">)</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26108r51"></a><span 
class="cmr-7">51</span></span><span 
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class="cmr-7">_send</span><span 
class="cmr-7">_out</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sends</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
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class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26109r52"></a><span 
class="cmr-7">52</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26110r53"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">computation</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">completed</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26111r54"></a><span 
class="cmr-7">54</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26112r55"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">images</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26113r56"></a><span 
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class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26114r57"></a><span 
class="cmr-7">57</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">,</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26115r58"></a><span 
class="cmr-7">58</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26116r59"></a><span 
class="cmr-7">59</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">function</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executed</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">by</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2</span><span 
class="cmr-7">nd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26117r60"></a><span 
class="cmr-7">60</span></span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">BlurFilter</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">in</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
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class="cmbx-7">const</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26118r61"></a><span 
class="cmr-7">61</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmsy-7">-</span><span 
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class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">blur</span><span 
class="cmr-7">(</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">,</span><span 
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class="cmmi-7">&#x003E;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26119r62"></a><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26120r63"></a><span 
class="cmr-7">63</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26121r64"></a><span 
class="cmr-7">64</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">function</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executed</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">by</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">3</span><span 
class="cmr-7">rd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26122r65"></a><span 
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class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EmbossFilter</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">in</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26123r66"></a><span 
class="cmr-7">66</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">emboss</span><span 
class="cmr-7">(</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26124r67"></a><span 
class="cmr-7">67</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26125r68"></a><span 
class="cmr-7">68</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26126r69"></a><span 
class="cmr-7">69</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">function</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executed</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">by</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">4</span><span 
class="cmr-7">th</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26127r70"></a><span 
class="cmr-7">70</span></span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Write</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26128r71"></a><span 
class="cmr-7">71</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">outfile</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">./</span><span 
class="cmr-7">out</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">name</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26129r72"></a><span 
class="cmr-7">72</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">write</span><span 
class="cmr-7">(</span><span 
class="cmr-7">outfile</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26130r73"></a><span 
class="cmr-7">73</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">image</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">name</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">has</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">been</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">written</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">disk</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26131r74"></a><span 
class="cmr-7">74</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">image</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26132r75"></a><span 
class="cmr-7">75</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26133r76"></a><span 
class="cmr-7">76</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26134r77"></a><span 
class="cmr-7">77</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26135r78"></a><span 
class="cmr-7">78</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26136r79"></a><span 
class="cmr-7">79</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[])</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26137r80"></a><span 
class="cmr-7">80</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26138r81"></a><span 
class="cmr-7">81</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cerr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">use</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[0]</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26139r82"></a><span 
class="cmr-7">82</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">=1.0]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">=.5]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">files</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26140r83"></a><span 
class="cmr-7">83</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26141r84"></a><span 
class="cmr-7">84</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26142r85"></a><span 
class="cmr-7">85</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">=1.0,</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">=0.5;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26143r86"></a><span 
class="cmr-7">86</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26144r87"></a><span 
class="cmr-7">87</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">+</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26145r88"></a><span 
class="cmr-7">88</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">+</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26146r89"></a><span 
class="cmr-7">89</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atof</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">+=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26147r90"></a><span 
class="cmr-7">90</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atof</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">+=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26148r91"></a><span 
class="cmr-7">91</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26149r92"></a><span 
class="cmr-7">92</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">InitializeMagick</span><span 
class="cmr-7">(</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26150r93"></a><span 
class="cmr-7">93</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26151r94"></a><span 
class="cmr-7">94</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26152r95"></a><span 
class="cmr-7">95</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26153r96"></a><span 
class="cmr-7">96</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">Task</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26154r97"></a><span 
class="cmr-7">97</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Read</span><span 
class="cmr-7">(&amp;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[</span><span 
class="cmr-7">start</span><span 
class="cmr-7">],</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">st</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26155r98"></a><span 
class="cmr-7">98</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">BlurFilter</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2</span><span 
class="cmr-7">nd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26156r99"></a><span 
class="cmr-7">99</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EmbossFilter</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">3</span><span 
class="cmr-7">rd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26157r100"></a><span 
class="cmr-7">100</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Write</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">4</span><span 
class="cmr-7">th</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26158r101"></a><span 
class="cmr-7">101</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executes</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipeline</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26159r102"></a><span 
class="cmr-7">102</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipeline</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26160r103"></a><span 
class="cmr-7">103</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26161r104"></a><span 
class="cmr-7">104</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26162r105"></a><span 
class="cmr-7">105</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26163r106"></a><span 
class="cmr-7">106</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 1351--><p class="indent" >   It is possible to instantiate the pipeline as a <span 
class="cmti-10">software accelerator</span>. In the following
we report only the code of the main function since it is the only part of the code that
differs: <!--l. 1354-->
<div class="lstlisting" id="listing-23"><span class="tlabel"><a 
 id="x1-26164r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">***************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26165r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">img</span><span 
class="cmr-7">_pipe2</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26166r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26167r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26168r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26169r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26170r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26171r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Read</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26172r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">offload</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipeline</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">BlurFilter</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EmbossFilter</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Write</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26173r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26174r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26175r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26176r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[])</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26177r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26178r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cerr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">use</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[0]</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26179r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">=1.0]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">=.5]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">files</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26180r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26181r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26182r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">=1.0,</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">=0.5;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26183r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26184r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">+</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26185r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">+</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26186r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atof</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">+=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26187r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atof</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">+=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26188r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26189r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">InitializeMagick</span><span 
class="cmr-7">(</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26190r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26191r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26192r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26193r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26194r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">Task</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">true</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">enable</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">accelerator</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26195r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">BlurFilter</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2</span><span 
class="cmr-7">nd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26196r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EmbossFilter</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">3</span><span 
class="cmr-7">rd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26197r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26223r60"></a><span 
class="cmr-7">60</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26224r61"></a><span 
class="cmr-7">61</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 1417--><p class="indent" >   Now, since the same filter may be applied in parallel to independent input images,
we can replace the second and third stage with two task-farm having the same
previous stage as worker. This is safe because we know that we can replicate the
function computing the filters: it is thread safe and has no internal shared state. The
resulting code is: <!--l. 1422-->
<div class="lstlisting" id="listing-24"><span class="tlabel"><a 
 id="x1-26225r1"></a><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">image</span><span 
class="cmr-7">(</span><span 
class="cmr-7">image</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">name</span><span 
class="cmr-7">(</span><span 
class="cmr-7">name</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26248r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Image</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">image</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26249r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">name</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26250r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">,</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26251r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26252r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmbx-7">typedef</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">function</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">,</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">)</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">fffarm</span><span 
class="cmr-7">_f</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26253r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmbx-7">char</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">begin</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">end</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">option</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26254r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">itr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">find</span><span 
class="cmr-7">(</span><span 
class="cmr-7">begin</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">end</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">option</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26255r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">itr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">!=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">end</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;&amp;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">itr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">!=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">end</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">itr</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26256r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nullptr</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26257r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26258r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">st</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26259r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Read</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26260r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Read</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">images</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">r</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26261r37"></a><span 
class="cmr-7">37</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">images</span><span 
class="cmr-7">((</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">)</span><span 
class="cmr-7">images</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">(</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26262r38"></a><span 
class="cmr-7">38</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26263r39"></a><span 
class="cmr-7">39</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26264r40"></a><span 
class="cmr-7">40</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26265r41"></a><span 
class="cmr-7">41</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">filepath</span><span 
class="cmr-7">(</span><span 
class="cmr-7">images</span><span 
class="cmr-7">[</span><span 
class="cmr-7">i</span><span 
class="cmr-7">])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26266r42"></a><span 
class="cmr-7">42</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">filename</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26267r43"></a><span 
class="cmr-7">43</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26268r44"></a><span 
class="cmr-7">44</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">get</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">only</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">filename</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26269r45"></a><span 
class="cmr-7">45</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">n</span><span 
class="cmr-7">=</span><span 
class="cmr-7">filepath</span><span 
class="cmr-7">.</span><span 
class="cmr-7">find</span><span 
class="cmr-7">_last</span><span 
class="cmr-7">_of</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26270r46"></a><span 
class="cmr-7">46</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">n</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">filename</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">filepath</span><span 
class="cmr-7">.</span><span 
class="cmr-7">substr</span><span 
class="cmr-7">(</span><span 
class="cmr-7">n</span><span 
class="cmr-7">+1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26271r47"></a><span 
class="cmr-7">47</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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 id="x1-26274r50"></a><span 
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 id="x1-26278r54"></a><span 
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 id="x1-26279r55"></a><span 
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 id="x1-26280r56"></a><span 
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 id="x1-26281r57"></a><span 
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 id="x1-26282r58"></a><span 
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 id="x1-26283r59"></a><span 
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 id="x1-26284r60"></a><span 
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 id="x1-26285r61"></a><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executed</span><span 
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 id="x1-26286r62"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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 id="x1-26287r63"></a><span 
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 id="x1-26289r65"></a><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26290r66"></a><span 
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class="cmr-7">//</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26291r67"></a><span 
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class="cmr-7">(</span><span 
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 id="x1-26292r68"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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 id="x1-26294r70"></a><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26295r71"></a><span 
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class="cmr-7">//</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">const</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26297r73"></a><span 
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class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">outfile</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">./</span><span 
class="cmr-7">out</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">name</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26298r74"></a><span 
class="cmr-7">74</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">write</span><span 
class="cmr-7">(</span><span 
class="cmr-7">outfile</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26299r75"></a><span 
class="cmr-7">75</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">image</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">name</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">has</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">been</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">written</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">disk</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26300r76"></a><span 
class="cmr-7">76</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">image</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26301r77"></a><span 
class="cmr-7">77</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26302r78"></a><span 
class="cmr-7">78</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26303r79"></a><span 
class="cmr-7">79</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26304r80"></a><span 
class="cmr-7">80</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">4</span><span 
class="cmr-7">th</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26305r81"></a><span 
class="cmr-7">81</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Writer</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_minode</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">this</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">a</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">multi</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">input</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26306r82"></a><span 
class="cmr-7">82</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26307r83"></a><span 
class="cmr-7">83</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Writer</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">received</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26308r84"></a><span 
class="cmr-7">84</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Write</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">this</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26309r85"></a><span 
class="cmr-7">85</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26310r86"></a><span 
class="cmr-7">86</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26311r87"></a><span 
class="cmr-7">87</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26312r88"></a><span 
class="cmr-7">88</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[])</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26313r89"></a><span 
class="cmr-7">89</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26314r90"></a><span 
class="cmr-7">90</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cerr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">use</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[0]</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26315r91"></a><span 
class="cmr-7">91</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">=1.0]</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26316r92"></a><span 
class="cmr-7">92</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">=.5]</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26317r93"></a><span 
class="cmr-7">93</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">blurWrk</span><span 
class="cmr-7">=2]</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26318r94"></a><span 
class="cmr-7">94</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">embossWrk</span><span 
class="cmr-7">=2]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">files</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26319r95"></a><span 
class="cmr-7">95</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26320r96"></a><span 
class="cmr-7">96</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26321r97"></a><span 
class="cmr-7">97</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">=1.0,</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">=0.5;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26322r98"></a><span 
class="cmr-7">98</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">blurWrk</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">embossWrk</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26323r99"></a><span 
class="cmr-7">99</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26324r100"></a><span 
class="cmr-7">100</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">+</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26325r101"></a><span 
class="cmr-7">101</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">+</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26326r102"></a><span 
class="cmr-7">102</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">+</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26327r103"></a><span 
class="cmr-7">103</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">+</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26328r104"></a><span 
class="cmr-7">104</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atof</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">+=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26329r105"></a><span 
class="cmr-7">105</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atof</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">+=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26330r106"></a><span 
class="cmr-7">106</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">n</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">blurWrk</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">n</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">+=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26331r107"></a><span 
class="cmr-7">107</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">m</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">embossWrk</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">m</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">+=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26332r108"></a><span 
class="cmr-7">108</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26333r109"></a><span 
class="cmr-7">109</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">InitializeMagick</span><span 
class="cmr-7">(</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26334r110"></a><span 
class="cmr-7">110</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26335r111"></a><span 
class="cmr-7">111</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26336r112"></a><span 
class="cmr-7">112</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26337r113"></a><span 
class="cmr-7">113</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26338r114"></a><span 
class="cmr-7">114</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_farm</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">blurFarm</span><span 
class="cmr-7">((</span><span 
class="cmr-7">fffarm</span><span 
class="cmr-7">_f</span><span 
class="cmr-7">)</span><span 
class="cmr-7">BlurFilter</span><span 
class="cmr-7">,</span><span 
class="cmr-7">blurWrk</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26339r115"></a><span 
class="cmr-7">115</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">blurFarm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">remove</span><span 
class="cmr-7">_collector</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26340r116"></a><span 
class="cmr-7">116</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">blurFarm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">set</span><span 
class="cmr-7">_scheduling</span><span 
class="cmr-7">_ondemand</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">set</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">auto</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">scheduling</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26341r117"></a><span 
class="cmr-7">117</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_farm</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">embossFarm</span><span 
class="cmr-7">((</span><span 
class="cmr-7">fffarm</span><span 
class="cmr-7">_f</span><span 
class="cmr-7">)</span><span 
class="cmr-7">EmbossFilter</span><span 
class="cmr-7">,</span><span 
class="cmr-7">embossWrk</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26342r118"></a><span 
class="cmr-7">118</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">this</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">needed</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">because</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">previous</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">does</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">not</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">has</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Collector</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26343r119"></a><span 
class="cmr-7">119</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">embossFarm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">setMultiInput</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26344r120"></a><span 
class="cmr-7">120</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">embossFarm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">remove</span><span 
class="cmr-7">_collector</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26345r121"></a><span 
class="cmr-7">121</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">embossFarm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">set</span><span 
class="cmr-7">_scheduling</span><span 
class="cmr-7">_ondemand</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">set</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">auto</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">scheduling</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26346r122"></a><span 
class="cmr-7">122</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">Task</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26347r123"></a><span 
class="cmr-7">123</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Read</span><span 
class="cmr-7">(&amp;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[</span><span 
class="cmr-7">start</span><span 
class="cmr-7">],</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">st</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26348r124"></a><span 
class="cmr-7">124</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">blurFarm</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2</span><span 
class="cmr-7">nd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26349r125"></a><span 
class="cmr-7">125</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">embossFarm</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">3</span><span 
class="cmr-7">rd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26350r126"></a><span 
class="cmr-7">126</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Writer</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">4</span><span 
class="cmr-7">th</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26351r127"></a><span 
class="cmr-7">127</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executes</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipeline</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26352r128"></a><span 
class="cmr-7">128</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipeline</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26353r129"></a><span 
class="cmr-7">129</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26354r130"></a><span 
class="cmr-7">130</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26355r131"></a><span 
class="cmr-7">131</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26356r132"></a><span 
class="cmr-7">132</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 1556--><p class="indent" >   A possible variant of the previous implementation, which uses only one scheduler
is the following one: <!--l. 1558-->
<div class="lstlisting" id="listing-25"><span class="tlabel"><a 
 id="x1-26357r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26358r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">img</span><span 
class="cmr-7">_farm</span><span 
class="cmr-7">+</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26359r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26360r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26361r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Blur</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Emboss</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26362r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26363r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Read</span><span 
class="cmr-7">&#x00A0;</span><span 
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 id="x1-26364r8"></a><span 
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 id="x1-26365r9"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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 id="x1-26367r11"></a><span 
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 id="x1-26368r12"></a><span 
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class="cmmi-7">&#x003E;</span><span 
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 id="x1-26369r13"></a><span 
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class="cmr-7">iostream</span><span 
class="cmmi-7">&#x003E;</span><span 
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 id="x1-26370r14"></a><span 
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 id="x1-26371r15"></a><span 
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 id="x1-26372r16"></a><span 
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 id="x1-26373r17"></a><span 
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class="cmr-7">HAS</span><span 
class="cmr-7">_CXX11</span><span 
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 id="x1-26374r18"></a><span 
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class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">pipeline</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26375r19"></a><span 
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class="cmr-7">/</span><span 
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 id="x1-26376r20"></a><span 
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class="cmr-7">Magick</span><span 
class="cmr-7">++.</span><span 
class="cmr-7">h</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26377r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Magick</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26378r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmbx-7">using</span><span 
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class="cmr-7">&#x00A0;</span><span 
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 id="x1-26379r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26380r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Image</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">image</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">name</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">r</span><span 
class="cmr-7">=1.0,</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">s</span><span 
class="cmr-7">=0.5)</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26381r25"></a><span 
class="cmr-7">25</span></span><span 
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class="cmr-7">image</span><span 
class="cmr-7">(</span><span 
class="cmr-7">image</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">name</span><span 
class="cmr-7">(</span><span 
class="cmr-7">name</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26382r26"></a><span 
class="cmr-7">26</span></span><span 
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 id="x1-26383r27"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">image</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26384r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
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class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">name</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26385r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26386r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26387r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26388r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmbx-7">char</span><span 
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class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">char</span><span 
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class="cmr-7">begin</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
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class="cmr-7">end</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
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class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">option</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26389r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">itr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">find</span><span 
class="cmr-7">(</span><span 
class="cmr-7">begin</span><span 
class="cmr-7">,</span><span 
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class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26390r34"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
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class="cmr-7">!=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">end</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26391r35"></a><span 
class="cmr-7">35</span></span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nullptr</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26392r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26393r37"></a><span 
class="cmr-7">37</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">st</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26394r38"></a><span 
class="cmr-7">38</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Read</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26395r39"></a><span 
class="cmr-7">39</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">Read</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">images</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">r</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26396r40"></a><span 
class="cmr-7">40</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">images</span><span 
class="cmr-7">((</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">)</span><span 
class="cmr-7">images</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">(</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26397r41"></a><span 
class="cmr-7">41</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26398r42"></a><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26399r43"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">=0;</span><span 
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class="cmr-7">num</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">i</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26400r44"></a><span 
class="cmr-7">44</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
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class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">filepath</span><span 
class="cmr-7">(</span><span 
class="cmr-7">images</span><span 
class="cmr-7">[</span><span 
class="cmr-7">i</span><span 
class="cmr-7">])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26401r45"></a><span 
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 id="x1-26402r46"></a><span 
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 id="x1-26403r47"></a><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">get</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">only</span><span 
class="cmr-7">&#x00A0;</span><span 
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 id="x1-26404r48"></a><span 
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class="cmbx-7">int</span><span 
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class="cmr-7">n</span><span 
class="cmr-7">=</span><span 
class="cmr-7">filepath</span><span 
class="cmr-7">.</span><span 
class="cmr-7">find</span><span 
class="cmr-7">_last</span><span 
class="cmr-7">_of</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26405r49"></a><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">n</span><span 
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class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">.</span><span 
class="cmr-7">substr</span><span 
class="cmr-7">(</span><span 
class="cmr-7">n</span><span 
class="cmr-7">+1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26406r50"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26407r51"></a><span 
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 id="x1-26408r52"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Image</span><span 
class="cmr-7">;;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26409r53"></a><span 
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class="cmr-7">img</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">read</span><span 
class="cmr-7">(</span><span 
class="cmr-7">filepath</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26410r54"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">(</span><span 
class="cmr-7">img</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">filename</span><span 
class="cmr-7">,</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">,</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26411r55"></a><span 
class="cmr-7">55</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">sending</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">out</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26412r56"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_send</span><span 
class="cmr-7">_out</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sends</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">t</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">next</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26413r57"></a><span 
class="cmr-7">57</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26414r58"></a><span 
class="cmr-7">58</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">computation</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">completed</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26415r59"></a><span 
class="cmr-7">59</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26416r60"></a><span 
class="cmr-7">60</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26417r61"></a><span 
class="cmr-7">61</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">images</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26418r62"></a><span 
class="cmr-7">62</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26419r63"></a><span 
class="cmr-7">63</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26420r64"></a><span 
class="cmr-7">64</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26421r65"></a><span 
class="cmr-7">65</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">function</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executed</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">by</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2</span><span 
class="cmr-7">nd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26422r66"></a><span 
class="cmr-7">66</span></span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">BlurFilter</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">in</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26423r67"></a><span 
class="cmr-7">67</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">blur</span><span 
class="cmr-7">(</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26424r68"></a><span 
class="cmr-7">68</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26425r69"></a><span 
class="cmr-7">69</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26426r70"></a><span 
class="cmr-7">70</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26427r71"></a><span 
class="cmr-7">71</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">function</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executed</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">by</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">3</span><span 
class="cmr-7">rd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26428r72"></a><span 
class="cmr-7">72</span></span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EmbossFilter</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">in</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26429r73"></a><span 
class="cmr-7">73</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">emboss</span><span 
class="cmr-7">(</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26430r74"></a><span 
class="cmr-7">74</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26431r75"></a><span 
class="cmr-7">75</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26432r76"></a><span 
class="cmr-7">76</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">function</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executed</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">by</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">4</span><span 
class="cmr-7">th</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26433r77"></a><span 
class="cmr-7">77</span></span><span 
class="cmr-7">Task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">Write</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26434r78"></a><span 
class="cmr-7">78</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">outfile</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">./</span><span 
class="cmr-7">out</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">name</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26435r79"></a><span 
class="cmr-7">79</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">write</span><span 
class="cmr-7">(</span><span 
class="cmr-7">outfile</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26436r80"></a><span 
class="cmr-7">80</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">image</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">name</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">has</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">been</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">written</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">disk</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26437r81"></a><span 
class="cmr-7">81</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">image</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26438r82"></a><span 
class="cmr-7">82</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26439r83"></a><span 
class="cmr-7">83</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26440r84"></a><span 
class="cmr-7">84</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26441r85"></a><span 
class="cmr-7">85</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">4</span><span 
class="cmr-7">th</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26442r86"></a><span 
class="cmr-7">86</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Writer</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_minode</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">this</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">a</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">multi</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">input</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26443r87"></a><span 
class="cmr-7">87</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26444r88"></a><span 
class="cmr-7">88</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Write</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">this</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26445r89"></a><span 
class="cmr-7">89</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26446r90"></a><span 
class="cmr-7">90</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26447r91"></a><span 
class="cmr-7">91</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26448r92"></a><span 
class="cmr-7">92</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[])</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26449r93"></a><span 
class="cmr-7">93</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26450r94"></a><span 
class="cmr-7">94</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cerr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">use</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[0]</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26451r95"></a><span 
class="cmr-7">95</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">=1.0]</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26452r96"></a><span 
class="cmr-7">96</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">=.5]</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26453r97"></a><span 
class="cmr-7">97</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Wrk</span><span 
class="cmr-7">=2]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">files</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26454r98"></a><span 
class="cmr-7">98</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26455r99"></a><span 
class="cmr-7">99</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26456r100"></a><span 
class="cmr-7">100</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">=1.0,</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">=0.5;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26457r101"></a><span 
class="cmr-7">101</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Wrks</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26458r102"></a><span 
class="cmr-7">102</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26459r103"></a><span 
class="cmr-7">103</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">+</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26460r104"></a><span 
class="cmr-7">104</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">+</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26461r105"></a><span 
class="cmr-7">105</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">+</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26462r106"></a><span 
class="cmr-7">106</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atof</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">+=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26463r107"></a><span 
class="cmr-7">107</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atof</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">+=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26464r108"></a><span 
class="cmr-7">108</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">n</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Wrks</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">n</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">+=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26465r109"></a><span 
class="cmr-7">109</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26466r110"></a><span 
class="cmr-7">110</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">InitializeMagick</span><span 
class="cmr-7">(</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26467r111"></a><span 
class="cmr-7">111</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26468r112"></a><span 
class="cmr-7">112</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26469r113"></a><span 
class="cmr-7">113</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26470r114"></a><span 
class="cmr-7">114</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26471r115"></a><span 
class="cmr-7">115</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">W</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26472r116"></a><span 
class="cmr-7">116</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">Wrks</span><span 
class="cmr-7">;++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">W</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">Task</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">BlurFilter</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EmbossFilter</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26473r117"></a><span 
class="cmr-7">117</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_farm</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">(</span><span 
class="cmr-7">W</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26474r118"></a><span 
class="cmr-7">118</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">remove</span><span 
class="cmr-7">_collector</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26475r119"></a><span 
class="cmr-7">119</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">set</span><span 
class="cmr-7">_scheduling</span><span 
class="cmr-7">_ondemand</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">set</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">auto</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">scheduling</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26476r120"></a><span 
class="cmr-7">120</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">Task</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26477r121"></a><span 
class="cmr-7">121</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Read</span><span 
class="cmr-7">(&amp;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[</span><span 
class="cmr-7">start</span><span 
class="cmr-7">],</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">st</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26478r122"></a><span 
class="cmr-7">122</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2</span><span 
class="cmr-7">nd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26479r123"></a><span 
class="cmr-7">123</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Writer</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">4</span><span 
class="cmr-7">th</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26480r124"></a><span 
class="cmr-7">124</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executes</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipeline</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26481r125"></a><span 
class="cmr-7">125</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipeline</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26482r126"></a><span 
class="cmr-7">126</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26483r127"></a><span 
class="cmr-7">127</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26484r128"></a><span 
class="cmr-7">128</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26485r129"></a><span 
class="cmr-7">129</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 1689--><p class="indent" >   The next step is to reduce the number of resources used. For example the farm
Emitter can be used to read files from the disk, whereas the farm Collector for
writing files to the disk. Furthermore, the blur and emboss filters may be computed
sequentially using a single workers. This is the so called &#8221;normal form&#8221; obtained
optimising the resource usage. The code implementing the normal form is the
following: <!--l. 1695-->
<div class="lstlisting" id="listing-26"><span class="tlabel"><a 
 id="x1-26486r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26487r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">img</span><span 
class="cmr-7">_farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26488r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26489r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26490r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26491r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Blur</span><span 
class="cmr-7">+</span><span 
class="cmr-7">Emboss</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26492r7"></a><span 
class="cmr-7">7</span></span><span 
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 id="x1-26493r8"></a><span 
class="cmr-7">8</span></span><span 
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class="cmr-7">Read</span><span 
class="cmr-7">+</span><span 
class="cmr-7">Sched</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmsy-7">-|</span><span 
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class="cmr-7">+</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
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class="cmr-7">+</span><span 
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 id="x1-26494r9"></a><span 
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 id="x1-26495r10"></a><span 
class="cmr-7">10</span></span><span 
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class="cmr-7">+</span><span 
class="cmr-7">Emboss</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
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 id="x1-26496r11"></a><span 
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class="cmr-7">/</span><span 
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 id="x1-26497r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
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class="cmmi-7">&#x003C;</span><span 
class="cmr-7">cassert</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26498r13"></a><span 
class="cmr-7">13</span></span><span 
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class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">iostream</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26499r14"></a><span 
class="cmr-7">14</span></span><span 
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 id="x1-26500r15"></a><span 
class="cmr-7">15</span></span><span 
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class="cmr-7">algorithm</span><span 
class="cmmi-7">&#x003E;</span><span 
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 id="x1-26501r16"></a><span 
class="cmr-7">16</span></span><span 
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 id="x1-26502r17"></a><span 
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class="cmbx-7">#</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">HAS</span><span 
class="cmr-7">_CXX11</span><span 
class="cmr-7">_VARIADIC</span><span 
class="cmr-7">_TEMPLATES</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26503r18"></a><span 
class="cmr-7">18</span></span><span 
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class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">pipeline</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26504r19"></a><span 
class="cmr-7">19</span></span><span 
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class="cmbx-7">include</span><span 
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class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26505r20"></a><span 
class="cmr-7">20</span></span><span 
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class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">Magick</span><span 
class="cmr-7">++.</span><span 
class="cmr-7">h</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26506r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Magick</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26507r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26508r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26509r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Image</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">image</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">name</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">r</span><span 
class="cmr-7">=1.0,</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">s</span><span 
class="cmr-7">=0.5)</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26510r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">image</span><span 
class="cmr-7">(</span><span 
class="cmr-7">image</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">name</span><span 
class="cmr-7">(</span><span 
class="cmr-7">name</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26511r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26512r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmsy-7">*</span><span 
class="cmr-7">image</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26513r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">name</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26514r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26515r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26516r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmbx-7">char</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">begin</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">end</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">option</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26517r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">itr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">find</span><span 
class="cmr-7">(</span><span 
class="cmr-7">begin</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">end</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">option</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26518r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">itr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">!=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">end</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;&amp;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">itr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">!=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">end</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">itr</span><span 
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 id="x1-26519r34"></a><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nullptr</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26520r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26521r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26522r37"></a><span 
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class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Read</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26523r38"></a><span 
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class="cmr-7">images</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
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class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">r</span><span 
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class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26524r39"></a><span 
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class="cmr-7">((</span><span 
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class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">num</span><span 
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class="cmr-7">(</span><span 
class="cmr-7">num</span><span 
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class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">(</span><span 
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class="cmr-7">,</span><span 
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class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26525r40"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">void</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
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 id="x1-26527r42"></a><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">i</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26528r43"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">filepath</span><span 
class="cmr-7">(</span><span 
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 id="x1-26529r44"></a><span 
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 id="x1-26530r45"></a><span 
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 id="x1-26531r46"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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 id="x1-26532r47"></a><span 
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class="cmr-7">=</span><span 
class="cmr-7">filepath</span><span 
class="cmr-7">.</span><span 
class="cmr-7">find</span><span 
class="cmr-7">_last</span><span 
class="cmr-7">_of</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
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class="cmr-7">&#8221;</span><span 
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 id="x1-26533r48"></a><span 
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class="cmr-7">substr</span><span 
class="cmr-7">(</span><span 
class="cmr-7">n</span><span 
class="cmr-7">+1)</span><span 
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 id="x1-26534r49"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26535r50"></a><span 
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 id="x1-26536r51"></a><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">;;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26537r52"></a><span 
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class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">read</span><span 
class="cmr-7">(</span><span 
class="cmr-7">filepath</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26538r53"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">(</span><span 
class="cmr-7">img</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">filename</span><span 
class="cmr-7">,</span><span 
class="cmr-7">radius</span><span 
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class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26539r54"></a><span 
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class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">sending</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">out</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
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class="cmmi-7">&#x003C;&#x003C;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26540r55"></a><span 
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class="cmr-7">ff</span><span 
class="cmr-7">_send</span><span 
class="cmr-7">_out</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sends</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">t</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">next</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26541r56"></a><span 
class="cmr-7">56</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26542r57"></a><span 
class="cmr-7">57</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">computation</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">completed</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26543r58"></a><span 
class="cmr-7">58</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26544r59"></a><span 
class="cmr-7">59</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26545r60"></a><span 
class="cmr-7">60</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">images</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26546r61"></a><span 
class="cmr-7">61</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26547r62"></a><span 
class="cmr-7">62</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">,</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26548r63"></a><span 
class="cmr-7">63</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26549r64"></a><span 
class="cmr-7">64</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">function</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executed</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">by</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2</span><span 
class="cmr-7">nd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26550r65"></a><span 
class="cmr-7">65</span></span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">BlurFilter</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">in</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26551r66"></a><span 
class="cmr-7">66</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">blur</span><span 
class="cmr-7">(</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26552r67"></a><span 
class="cmr-7">67</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26553r68"></a><span 
class="cmr-7">68</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26554r69"></a><span 
class="cmr-7">69</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26555r70"></a><span 
class="cmr-7">70</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">function</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executed</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">by</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">3</span><span 
class="cmr-7">rd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26556r71"></a><span 
class="cmr-7">71</span></span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EmbossFilter</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">in</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26557r72"></a><span 
class="cmr-7">72</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">emboss</span><span 
class="cmr-7">(</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26558r73"></a><span 
class="cmr-7">73</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26559r74"></a><span 
class="cmr-7">74</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26560r75"></a><span 
class="cmr-7">75</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">BlurEmbossWrapper</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26561r76"></a><span 
class="cmr-7">76</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26562r77"></a><span 
class="cmr-7">77</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26563r78"></a><span 
class="cmr-7">78</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EmbossFilter</span><span 
class="cmr-7">(</span><span 
class="cmr-7">BlurFilter</span><span 
class="cmr-7">(</span><span 
class="cmr-7">task</span><span 
class="cmr-7">,</span><span 
class="cmbx-7">this</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmbx-7">this</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26564r79"></a><span 
class="cmr-7">79</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26565r80"></a><span 
class="cmr-7">80</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26566r81"></a><span 
class="cmr-7">81</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">function</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executed</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">by</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">4</span><span 
class="cmr-7">th</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26567r82"></a><span 
class="cmr-7">82</span></span><span 
class="cmr-7">Task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">Write</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26568r83"></a><span 
class="cmr-7">83</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">outfile</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">./</span><span 
class="cmr-7">out</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">name</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26569r84"></a><span 
class="cmr-7">84</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">write</span><span 
class="cmr-7">(</span><span 
class="cmr-7">outfile</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26570r85"></a><span 
class="cmr-7">85</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">image</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">name</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">has</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">been</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">written</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">disk</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26571r86"></a><span 
class="cmr-7">86</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">image</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26572r87"></a><span 
class="cmr-7">87</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26573r88"></a><span 
class="cmr-7">88</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26574r89"></a><span 
class="cmr-7">89</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26575r90"></a><span 
class="cmr-7">90</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">4</span><span 
class="cmr-7">th</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26576r91"></a><span 
class="cmr-7">91</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Writer</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_minode</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">this</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">a</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">multi</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">input</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26577r92"></a><span 
class="cmr-7">92</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26578r93"></a><span 
class="cmr-7">93</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Write</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">Task</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">this</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26579r94"></a><span 
class="cmr-7">94</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26580r95"></a><span 
class="cmr-7">95</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26581r96"></a><span 
class="cmr-7">96</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26582r97"></a><span 
class="cmr-7">97</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[])</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26583r98"></a><span 
class="cmr-7">98</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26584r99"></a><span 
class="cmr-7">99</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cerr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">use</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[0]</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26585r100"></a><span 
class="cmr-7">100</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">=1.0]</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26586r101"></a><span 
class="cmr-7">101</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">=.5]</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26587r102"></a><span 
class="cmr-7">102</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Wrks</span><span 
class="cmr-7">=2]</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26588r103"></a><span 
class="cmr-7">103</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Wrk</span><span 
class="cmr-7">=2]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">files</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26589r104"></a><span 
class="cmr-7">104</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26590r105"></a><span 
class="cmr-7">105</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26591r106"></a><span 
class="cmr-7">106</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">=1.0,</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">=0.5;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26592r107"></a><span 
class="cmr-7">107</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Wrks</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26593r108"></a><span 
class="cmr-7">108</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26594r109"></a><span 
class="cmr-7">109</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">+</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26595r110"></a><span 
class="cmr-7">110</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">+</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26596r111"></a><span 
class="cmr-7">111</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">+</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26597r112"></a><span 
class="cmr-7">112</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atof</span><span 
class="cmr-7">(</span><span 
class="cmr-7">r</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">+=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26598r113"></a><span 
class="cmr-7">113</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atof</span><span 
class="cmr-7">(</span><span 
class="cmr-7">s</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">+=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26599r114"></a><span 
class="cmr-7">114</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">n</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Wrks</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">n</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">+=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26600r115"></a><span 
class="cmr-7">115</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26601r116"></a><span 
class="cmr-7">116</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">InitializeMagick</span><span 
class="cmr-7">(</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26602r117"></a><span 
class="cmr-7">117</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26603r118"></a><span 
class="cmr-7">118</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26604r119"></a><span 
class="cmr-7">119</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">W</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26605r120"></a><span 
class="cmr-7">120</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">Wrks</span><span 
class="cmr-7">;++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">W</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">BlurEmbossWrapper</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26606r121"></a><span 
class="cmr-7">121</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_farm</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">(</span><span 
class="cmr-7">W</span><span 
class="cmr-7">,</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Read</span><span 
class="cmr-7">(&amp;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[</span><span 
class="cmr-7">start</span><span 
class="cmr-7">],</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">radius</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sigma</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Writer</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26607r122"></a><span 
class="cmr-7">122</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executes</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26608r123"></a><span 
class="cmr-7">123</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipeline</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26609r124"></a><span 
class="cmr-7">124</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26610r125"></a><span 
class="cmr-7">125</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26611r126"></a><span 
class="cmr-7">126</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-26612r127"></a><span 
class="cmr-7">127</span></span><span 
class="cmsy-7">}</span>
   </div>
                                                                  

                                                                  
   <h2 class="chapterHead"><span class="titlemark">Chapter&#x00A0;4</span><br /><a 
 id="x1-270004"></a>Data parallelism</h2>
<!--l. 4--><p class="noindent" >In data parallel computation, data structures (typically large) are partitioned among
the number of concurrent resources each of which computes the same function on the
assigned partition. In a nutshell, the input task, possibly but not necessarily coming
from an input stream, is split into multiple sub-task each one computed in parallel
and then collected together in one single output task. The computation on the
sub-tasks may be completely independent (i.e. the sub-task computation uses data
only coming from the the current sub-task) or dependent on previously computed
data (non necessarily in the corresponding sub-task). The main goal of data parallel
computation is to reduce the <span 
class="cmti-10">completion time </span>of the single task to compute. It is
important to note that, data decomposition using large sub-tasks, together
with static assignment of such partitions to workers, may introduce <span 
class="cmti-10">load</span>
<span 
class="cmti-10">imbalance </span>during the computation mainly because of the variable calculation
time associated to distinct partitions. In general, it is possible to state that
load balancing is a feature of anonymous task assignment, i.e. tasks to be
computed are dynamically assigned to available computing resources, without
a-priori correspondence between tasks and available computing resources.
The task-farm paradigm is naturally based on this concept (where tasks are
stream items), and for this reason quite often data-parallel computations are
implemented on top of the task-farm skeleton by using the <span 
class="cmti-10">auto-scheduling</span>
policy (see Sec.&#x00A0;<a 
href="#x1-200003.3">3.3<!--tex4ht:ref: sec:ff:auto --></a>). Many other scheduling strategies have been devised for
balancing data-parallel computations, among these, the <span 
class="cmti-10">work-stealing </span>scheduling
strategy is of particular importance. It is worth to note here that, when the
task-farm is used to implement an unbalanced data parallel computation, it is
possible to &#8221;customise&#8221; it to use a <span 
class="cmti-10">work-stealing </span>scheduling strategy. In other
words, the task-farm pattern just models functional replication, while data
partitioning and task-scheduling depends on the way the Emitter entity is
implemented.
<!--l. 27--><p class="indent" >   Well known and widely used data parallel skeletons are: <span 
class="cmti-10">map reduce </span>and
<span 
class="cmti-10">stencil</span>.
   <h3 class="sectionHead"><span class="titlemark">4.1   </span> <a 
 id="x1-280004.1"></a>Data parallel skeletons</h3>
<!--l. 32--><p class="noindent" >In this section we describe <span 
class="cmti-10">map</span>-like and <span 
class="cmti-10">reduce</span>-like patterns, whereas the <span 
class="cmti-10">stencil</span>
pattern is not covered.
<!--l. 35--><p class="noindent" >
   <h5 class="likesubsubsectionHead"><a 
 id="x1-290004.1"></a><span 
class="cmti-10">map</span></h5>
<!--l. 37--><p class="noindent" >The simplest data parallel computation is the <span 
class="cmti-10">map</span>, in which the concurrent workers
operating on a partition of the input data structure (typically an N-dimensional
array) are fully independent, i.e. each of them operates on its own local data only,
without any cooperation with other computing resources. As an example consider the
following piece of code: <!--l. 42-->
<div class="lstlisting" id="listing-27"><span class="tlabel"><a 
 id="x1-29001r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">size</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">N</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">15;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-29002r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">[</span><span 
class="cmr-7">N</span><span 
class="cmr-7">],</span><span 
class="cmr-7">B</span><span 
class="cmr-7">[</span><span 
class="cmr-7">N</span><span 
class="cmr-7">];</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-29003r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmr-7">size</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=1;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">N</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-29004r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">[</span><span 
class="cmr-7">i</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">F</span><span 
class="cmr-7">(</span><span 
class="cmr-7">B</span><span 
class="cmr-7">[</span><span 
class="cmr-7">i</span><span 
class="cmr-7">])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-29005r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmr-7">A</span><span 
class="cmr-7">[</span><span 
class="cmr-7">N</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">F</span><span 
class="cmr-7">(</span><span 
class="cmr-7">B</span><span 
class="cmr-7">[0])</span><span 
class="cmr-7">;</span>
                                                                  

                                                                  
   </div>
<!--l. 49--><p class="noindent" >If the function <span 
class="cmmi-10">F </span>has no internal state, each loop iteration may be computed
independently since there are no true dependency among iterations. In this case we
may apply the map pattern, splitting the two arrays <span 
class="cmmi-10">A,B </span>in <span 
class="cmmi-10">n </span>= <img 
src="tutorial13x.png" alt="--N----
nworkers"  class="frac" align="middle"> parts and
assign each part to one worker. Each worker executes the same loop as above on a
restricted index range. In principle, the execution time can be reduced by a factor of
<span 
class="cmmi-10">n </span>if we consider a run-time with zero overhead, and as a particular case, if
<span 
class="cmmi-10">nworkers </span>= <span 
class="cmmi-10">N</span>, the execution time is reduced from <span 
class="cmmi-10">O</span>(<span 
class="cmmi-10">N</span>) to <span 
class="cmmi-10">O</span>(1). It is worth to note
that, the <span 
class="cmti-10">map </span>skeleton may be simply implemented using a <span 
class="cmti-10">task-farm </span>skeleton
operating on a single input data. The Emitter split the input arrays and distributes
the partitions to each worker. The workers apply the function <span 
class="cmmi-10">F </span>on the input
partition, finally the Collector collects the workers&#8217; partitions in one single output
task.
<!--l. 62--><p class="noindent" >
   <h5 class="likesubsubsectionHead"><a 
 id="x1-300004.1"></a><span 
class="cmti-10">Loop-parallelism</span></h5>
<!--l. 64--><p class="noindent" >A sequential iterative kernel with independent iterations is also known as a <span 
class="cmti-10">parallel</span>
<span 
class="cmti-10">loop</span>. Parallel loops may be clearly parallelized by using the <span 
class="cmti-10">map </span>or <span 
class="cmti-10">farm </span>skeletons,
but this typically requires a substantial re-factoring of the original loop code with the
possibility to introduce bugs and not preserving <span 
class="cmti-10">sequential equivalence</span>. Furthermore,
the selection of the appropriate implementation skeleton together with a correct
implementation of the sequential wrapper code is of foremost importance for
obtaining the best performance.
<!--l. 71--><p class="indent" >   For these reasons, in the <span 
class="cmss-10">FastFlow</span> framework there are a set of data parallel
patterns implemented on top of the basic <span 
class="cmss-10">FastFlow</span> skeletons to ease the
implementation of parallel loops.
<!--l. 74--><p class="noindent" >
   <h3 class="sectionHead"><span class="titlemark">4.2   </span> <a 
 id="x1-310004.2"></a><span 
class="cmss-10">FastFlow</span> abstractions</h3>
<!--l. 76--><p class="noindent" >In this section we describe the different parallel-for abstractions that are used to
implement almost all data-parallel skeletons currently available in the <span 
class="cmss-10">FastFlow</span>
framework for multi-core systems.
<!--l. 79--><p class="noindent" >
   <h4 class="subsectionHead"><span class="titlemark">4.2.1   </span> <a 
 id="x1-320004.2.1"></a><span 
class="cmti-10">ParallelFor</span></h4>
<!--l. 81--><p class="noindent" >Here we introduce the <span 
class="cmss-10">FastFlow</span> <span 
class="cmti-10">ParallelFor </span>pattern that can be used to parallelize
loops having independent iterations:
                                                                  

                                                                  
   <div class="verbatim" id="verbatim-2">
for(long&#x00A0;idx=first;&#x00A0;idx&#x00A0;&#x003C;&#x00A0;last;&#x00A0;idx&#x00A0;+=&#x00A0;step)&#x00A0;bodyF;
</div>
<!--l. 86--><p class="nopar" > The class interface of the <span 
class="cmti-10">ParallelFor </span>pattern is described in the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">parallel_for.hpp</span></span></span>
file. The constructor accepts two parameters:
                                                                  

                                                                  
   <div class="verbatim" id="verbatim-3">
ParallelFor(const&#x00A0;long&#x00A0;maxnworkers=FF_AUTO,bool&#x00A0;spinWait=false);
</div>
<!--l. 93--><p class="nopar" > the first parameter sets the maximum number of worker threads that can be used in
the ParallelFor (that is the maximum concurrency degree), the second argument sets
non-blocking run-time for parallel computations. At the beginning you may just leave
the default parameters for these two arguments.
<!--l. 100--><p class="indent" >   The <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ParallelFor</span></span></span> object, encapsulates a number of <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">parallel_for</span></span></span>
methods, which differentiate each other for the number of arguments they
get and for the signatures of the function body. A single ParallelFor object
can be used as many times as needed to run different parallel-for instances
(different loop bodies). Nested invocations of ParallelFor methods are not
supported.
<!--l. 105--><p class="indent" >   The loop body may be a standard function or a C++11 lambda-function. A
C++11 lambda-function is a new feature of the C++11 standard already supported
by many compilers. They are unnamed closures (i.e. function objects that can be
constructed and managed like data) that allow functions to be syntactically defined
where and when needed. When lambda functions are built, they can capture the
state of non-local variables named in the wrapped code either by value or by
reference.
<!--l. 112--><p class="indent" >   The following list presents the most useful parallel-for methods provided by the
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ParallelFor</span></span></span> class:
                                                                  

                                                                  
   <div class="verbatim" id="verbatim-4">
parallel_for(first,last,&#x00A0;bodyF,&#x00A0;nworkers);//&#x00A0;step=1,grain=FF_AUTO
&#x00A0;<br />parallel_for(first,last,step,&#x00A0;bodyF,&#x00A0;nworkers);//&#x00A0;grain=FF_AUTO
&#x00A0;<br />parallel_for(first,last,step,grain,&#x00A0;bodyF,&#x00A0;nworekrs);
&#x00A0;<br />bodyF&#x00A0;=&#x00A0;F(const&#x00A0;long&#x00A0;idx);
&#x00A0;<br />
&#x00A0;<br />parallel_for_thid(first,last,step,grain,&#x00A0;bodyF,&#x00A0;nworkers);
&#x00A0;<br />bodyF&#x00A0;=&#x00A0;F(const&#x00A0;long&#x00A0;idx,const&#x00A0;int&#x00A0;thid);
&#x00A0;<br />//&#x00A0;thid&#x00A0;is&#x00A0;the&#x00A0;id&#x00A0;of&#x00A0;the&#x00A0;thread&#x00A0;executing&#x00A0;the&#x00A0;body&#x00A0;function
&#x00A0;<br />
&#x00A0;<br />parallel_for_idx(first,last,step,grain,&#x00A0;bodyF,&#x00A0;nworkers);
&#x00A0;<br />bodyF&#x00A0;=&#x00A0;F(const&#x00A0;long&#x00A0;begin,const&#x00A0;long&#x00A0;end,const&#x00A0;int&#x00A0;thid);
</div>
<!--l. 126--><p class="nopar" > Now, given the following sequential loop:
                                                                  

                                                                  
   <div class="verbatim" id="verbatim-5">
auto&#x00A0;F&#x00A0;=&#x00A0;[](const&#x00A0;long&#x00A0;i)&#x00A0;{&#x00A0;return&#x00A0;i&#x22C6;i;}
&#x00A0;<br />for(long&#x00A0;i=1;&#x00A0;i&#x00A0;&#x003C;&#x00A0;100;&#x00A0;i&#x00A0;+=2)&#x00A0;A[i]&#x00A0;=&#x00A0;F(i);
</div>
<!--l. 134--><p class="nopar" > we can write the following parallel-for:
                                                                  

                                                                  
   <div class="verbatim" id="verbatim-6">
ParallelFor&#x00A0;pf;
&#x00A0;<br />auto&#x00A0;F&#x00A0;=&#x00A0;[](const&#x00A0;long&#x00A0;i)&#x00A0;{&#x00A0;return&#x00A0;i&#x22C6;i;}
&#x00A0;<br />pf.parallel_for(1,100,2,[&amp;A](const&#x00A0;long&#x00A0;i)&#x00A0;{&#x00A0;A[i]=F(i);});
</div>
<!--l. 143--><p class="nopar" > or by using the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">parallel_for_idx</span></span></span> we have:
                                                                  

                                                                  
   <div class="verbatim" id="verbatim-7">
ParallelFor&#x00A0;pf;
&#x00A0;<br />auto&#x00A0;F&#x00A0;=&#x00A0;[](const&#x00A0;long&#x00A0;i)&#x00A0;{&#x00A0;return&#x00A0;i&#x22C6;i;}
&#x00A0;<br />pf.parallel_for_idx(1,100,2,[&amp;A](const&#x00A0;long&#x00A0;begin,const&#x00A0;long&#x00A0;end,
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;const&#x00A0;int&#x00A0;thid){
&#x00A0;<br />&#x00A0;std::cout&#x00A0;&#x003C;&#x003C;&#x00A0;"Hello&#x00A0;I'm&#x00A0;thread&#x00A0;"&#x00A0;&#x003C;&#x003C;&#x00A0;thid
&#x00A0;<br />&#x00A0;&#x00A0;&#x003C;&#x003C;&#x00A0;"&#x00A0;executing&#x00A0;iterations&#x00A0;("&#x00A0;&#x003C;&#x003C;&#x00A0;start&#x00A0;&#x003C;&#x003C;","&#x00A0;&#x003C;&#x003C;&#x00A0;end&#x00A0;&#x003C;&#x003C;")\n";
&#x00A0;<br />&#x00A0;for(long&#x00A0;i=begin;&#x00A0;i&#x003C;end;&#x00A0;i&#x00A0;+=&#x00A0;2)&#x00A0;A[i]=F(i);
&#x00A0;<br />});
</div>
<!--l. 157--><p class="nopar" > the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">parallel_for_idx</span></span></span> is just a &#8221;low-level&#8221; version of the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">parallel_for</span></span></span>,
where the internal loop, iterating over all iterations assigned to the worker, has to be
written directly by the user. This may be useful when it is needed to execute a
pre-computation (executed in parallel) before starting the execution of the loop
iterations, or in general for debugging purposes.
<!--l. 165--><p class="indent" >   It is important to remark that, when <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">spinWait</span></span></span> is set to <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">true</span></span></span> (see Sec.&#x00A0;<a 
href="#x1-340004.2.1">4.2.1<!--tex4ht:ref: sec:ff:pause --></a> for
details), in some particular cases, the body function is called the first time with
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">begin==end==0</span></span></span> so it would be safe to test this condition at the beginning of the
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">parallel_for_idx</span></span></span> (i.e. <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">if</span><span 
class="pcrr7t-">&#x00A0;(begin==end)</span><span 
class="pcrr7t-">&#x00A0;return;</span></span></span>).
<!--l. 170--><p class="indent" >   Let&#8217;s now see a very simple usage example of the parallel-for: <!--l. 171-->
<div class="lstlisting" id="listing-28"><span class="tlabel"><a 
 id="x1-32001r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32002r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">parfor1</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32003r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32004r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_for</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32005r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32006r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32007r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[])</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32008r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32009r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">N</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atol</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[1])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32010r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">A</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">[</span><span 
class="cmr-7">N</span><span 
class="cmr-7">];</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32011r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ParallelFor</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pf</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32012r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">initialize</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">array</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32013r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pf</span><span 
class="cmr-7">.</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_for</span><span 
class="cmr-7">(0,</span><span 
class="cmr-7">N</span><span 
class="cmr-7">,[&amp;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">](</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">[</span><span 
class="cmr-7">i</span><span 
class="cmr-7">]=</span><span 
class="cmr-7">i</span><span 
class="cmr-7">;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32014r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">do</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">something</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">on</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">each</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">even</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">element</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">of</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">array</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32015r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pf</span><span 
class="cmr-7">.</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_for</span><span 
class="cmr-7">(0,</span><span 
class="cmr-7">N</span><span 
class="cmr-7">,2,[&amp;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">](</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">[</span><span 
class="cmr-7">i</span><span 
class="cmr-7">]=</span><span 
class="cmr-7">i</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">i</span><span 
class="cmr-7">;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32016r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">print</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">result</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32017r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">N</span><span 
class="cmr-7">;++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">[</span><span 
class="cmr-7">i</span><span 
class="cmr-7">]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32018r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32019r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-32020r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 193--><p class="noindent" >in this case, first the array <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">A</span></span></span> has been initialised using a parallel-for and
then the square value of the even entries is computed in parallel over <span 
class="cmmi-10">N&#x2215;</span>2
iterations.
<!--l. 198--><p class="noindent" >
   <h5 class="likesubsubsectionHead"><a 
 id="x1-330004.2.1"></a>Iterations scheduling</h5>
<!--l. 200--><p class="noindent" >Three distinct iteration schedulings are currently possible in parallel-for
computations:
     <dl class="enumerate"><dt class="enumerate">
  1. </dt><dd 
class="enumerate"><span 
class="cmbx-10">default  static  scheduling</span>:  the  iteration  space  is  (almost)  evenly
     partitioned  in  large  contiguous  chunks,  and  then  they  are  statically
     assigned to workers, one chunk for each worker.
     </dd><dt class="enumerate">
  2. </dt><dd 
class="enumerate"><span 
class="cmbx-10">static scheduling with interleaving </span><span 
class="cmmi-10">k</span>: the iteration space is statically
     divided among all active workers in a round-robin fashion using a stride
     of  <span 
class="cmmi-10">k</span>.  For  example,  to  execute  10  iterations  (from  0  to  9)  using  a
     concurrency  degree  of  2  and  a  stride  <span 
class="cmmi-10">k  </span>=  3,  then  the  first  thread
     executes iterations 0<span 
class="cmmi-10">,</span>1<span 
class="cmmi-10">,</span>2<span 
class="cmmi-10">,</span>6<span 
class="cmmi-10">,</span>7<span 
class="cmmi-10">,</span>8 and the second thread executes iterations
     3<span 
class="cmmi-10">,</span>4<span 
class="cmmi-10">,</span>5<span 
class="cmmi-10">,</span>9. The default static scheduling is obtained setting a stride <span 
class="cmmi-10">k </span>=
     <span 
class="cmmi-10">iterationspace&#x2215;nworkers</span>.
                                                                  

                                                                  
     </dd><dt class="enumerate">
  3. </dt><dd 
class="enumerate"><span 
class="cmbx-10">dynamic  scheduling  with  chunk  </span><span 
class="cmmi-10">k</span>:  in  this  case  no  more  than  <span 
class="cmmi-10">k</span>
     contiguous iterations at a time are dynamically assigned to computing
     workers. As soon as a worker completes computation of one chunk of
     iterations, a new chunk (if available) is selected and assigned to the worker.
     The run-time tries to select as many as possible contiguous chunks in
     order to better exploit spatial locality. This allows to have a good trade-off
     between iterations affinity and load-balancing.</dd></dl>
<!--l. 221--><p class="indent" >   By default the <span 
class="cmti-10">default static scheduling </span>is used. In general, the scheduling
policy is selected by specifying the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">grain</span></span></span> parameter of the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">parallel_for</span></span></span>
method. If the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">grain</span></span></span> parameter is not specified or if its value is <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">0</span></span></span>, then the
<span 
class="cmti-10">default static scheduling </span>is selected. If <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">grain</span></span></span> is greater than zero, then the
<span 
class="cmti-10">dynamic scheduling </span>is selected with <span 
class="cmmi-10">k </span>= <span 
class="cmmi-10">grain</span>. Finally, to use the <span 
class="cmti-10">static</span>
<span 
class="cmti-10">scheduling with interleaving </span><span 
class="cmmi-10">k </span>the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">parallel_for_static</span></span></span> method must be
used with <span 
class="cmmi-10">k </span>= <span 
class="cmmi-10">grain</span>. Note that, if in the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">parallel_for_static</span></span></span> the
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">grain</span></span></span> parameter is zero, than the <span 
class="cmti-10">default static scheduling </span>policy is selected.
<!--l. 230--><p class="indent" >   Summarising, in the following different scheduling strategies are selected
according to the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">grain</span></span></span> parameter:
                                                                  

                                                                  
   <div class="verbatim" id="verbatim-8">
pf.parallel_for(1,100,2,&#x00A0;&#x00A0;&#x00A0;bodyF);&#x00A0;//&#x00A0;default&#x00A0;static&#x00A0;sched.
&#x00A0;<br />pf.parallel_for(1,100,2,&#x00A0;0,bodyF);&#x00A0;//&#x00A0;default&#x00A0;static&#x00A0;sched.
&#x00A0;<br />pf.parallel_for(1,100,2,10,bodyF);&#x00A0;//&#x00A0;dynamic&#x00A0;sched.&#x00A0;with&#x00A0;k=10
&#x00A0;<br />pf.parallel_for_static(1,100,2,10,bodyF);//&#x00A0;static&#x00A0;sched.
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;//&#x00A0;interleaving&#x00A0;k=10
&#x00A0;<br />pf.parallel_for_static(1,100,2,0,bodyF);&#x00A0;//&#x00A0;default&#x00A0;static&#x00A0;sched.
</div>
<!--l. 240--><p class="nopar" >
<!--l. 243--><p class="noindent" >
   <h5 class="likesubsubsectionHead"><a 
 id="x1-340004.2.1"></a><span 
class="cmti-10">threadPause </span>and <span 
class="cmti-10">disableScheduler</span></h5>
<!--l. 245--><p class="noindent" >The <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">spinWait</span></span></span> parameter in the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ParallelFor</span></span></span> constructor enables non-blocking
computation between successive calls of <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">parallel_for</span></span></span> methods. This means that if
the parallel-for is not destructed and not used for a while, the worker threads will be
active in a busy waiting loop. In this case it may be useful to &#8221;pause&#8221; the threads
until the parallel-for pattern is used again. To attain this, the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">threadPause</span></span></span> method
can be used. The next time the parallel-for is used, the non-blocking run-time will be
still active.
<!--l. 253--><p class="indent" >   Another interesting option of the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ParallelFor</span></span></span> object, is the possibility to
switch between two distinct run-time support for the scheduling of loop
iterations:
     <dl class="enumerate"><dt class="enumerate">
  1. </dt><dd 
class="enumerate"><span 
class="cmti-10">active  scheduling  </span>where  an  active  non-blocking  scheduler  thread  (the
     farm&#8217;s Emitter) is used to implement the <span 
class="cmti-10">auto-scheduling </span>policy;
     </dd><dt class="enumerate">
  2. </dt><dd 
class="enumerate"><span 
class="cmti-10">passive  scheduling   </span>where  workers  cooperatively  schedule  tasks  via
     non-blocking synchronisations in memory.</dd></dl>
<!--l. 262--><p class="indent" >   Which one is better ? It is difficult to say, as it depends on many factors:
parallelism degree, task granularity and underlying platform, among others. As a rule
of thumb, on large multi-core and with fine-grain tasks active scheduling typically
runs faster; on the other hand, when there are more threads than available cores
the passive scheduler allows reduction of CPU conflicts obtaining better
performance.
<!--l. 267--><p class="indent" >   By default, if the number of active workers is less than the number of available
cores, than the active scheduling is used. To dynamically switch between active
(false) and passive (true) scheduling strategies the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">disableScheduler</span></span></span> method can
be used.
                                                                  

                                                                  
<!--l. 270--><p class="noindent" >
   <h4 class="subsectionHead"><span class="titlemark">4.2.2   </span> <a 
 id="x1-350004.2.2"></a><span 
class="cmti-10">ParallelForReduce</span></h4>
<!--l. 272--><p class="noindent" >The <span 
class="cmss-10">FastFlow</span> <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ParallelForReduce</span></span></span> is used to perform a parallel-for computation
plus a reduction operation (by using a combiner function named <span 
class="cmti-10">reduceF </span>in the
following) over a sequence of elements of type <span 
class="cmti-10">T</span>. In order to deterministically
compute the result, the reduction function needs to be associative and commutative.
<!--l. 278--><p class="indent" >   The constructor interface is:
                                                                  

                                                                  
   <div class="verbatim" id="verbatim-9">
ParallelForReduce&#x003C;T&#x003E;(const&#x00A0;long&#x00A0;max=FF_AUTO,bool&#x00A0;spinwait=false);
</div>
<!--l. 282--><p class="nopar" > where the template type <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">T</span></span></span> is the type of the reduction variable, the first
parameter sets the maximum number of worker threads that can be used in the
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ParallelForReduce</span></span></span>, the second argument sets non-blocking run-time.
<!--l. 288--><p class="indent" >   The <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ParallelForReduce</span></span></span> class provides all the parallel-for methods already
provided by the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ParallelFor</span></span></span> class and a set of additional <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">parallel_reduce</span></span></span>
methods:
                                                                  

                                                                  
   <div class="verbatim" id="verbatim-10">
parallel_reduce(var,identity,&#x00A0;first,last,
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;bodyF,&#x00A0;reduceF,&#x00A0;nworkers);//&#x00A0;step=1,grain=FF_AUTO
&#x00A0;<br />parallel_reduce(var,identity,&#x00A0;first,last,step,
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;bodyF,&#x00A0;reduceF,&#x00A0;nworkers);//&#x00A0;grain=FF_AUTO
&#x00A0;<br />parallel_reduce(var,identity,&#x00A0;first,last,step,grain,
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;bodyF,&#x00A0;reduceF,&#x00A0;nworekrs);
&#x00A0;<br />bodyF&#x00A0;&#x00A0;&#x00A0;=F(const&#x00A0;long&#x00A0;idx,T&amp;&#x00A0;var);
&#x00A0;<br />reduceF&#x00A0;=R(T&amp;&#x00A0;var,const&#x00A0;T&amp;&#x00A0;elem);
&#x00A0;<br />
&#x00A0;<br />parallel_reduce_thid(var,identity,&#x00A0;first,last,step,grain,
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;bodyF,&#x00A0;reduceF,&#x00A0;nworkers);
&#x00A0;<br />bodyF&#x00A0;&#x00A0;&#x00A0;=F(const&#x00A0;long&#x00A0;idx,T&amp;&#x00A0;var,const&#x00A0;int&#x00A0;thid);
&#x00A0;<br />reduceF&#x00A0;=R(T&amp;&#x00A0;var,const&#x00A0;T&amp;&#x00A0;elem);
&#x00A0;<br />//&#x00A0;thid&#x00A0;is&#x00A0;the&#x00A0;id&#x00A0;of&#x00A0;the&#x00A0;thread&#x00A0;executing&#x00A0;the&#x00A0;body&#x00A0;function
&#x00A0;<br />
&#x00A0;<br />parallel_reduce_idx(var,identity,&#x00A0;first,last,step,grain,
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;bodyF,&#x00A0;reduceF,&#x00A0;nworkers);
&#x00A0;<br />bodyF&#x00A0;&#x00A0;&#x00A0;=F(T&amp;&#x00A0;var,const&#x00A0;long&#x00A0;begin,const&#x00A0;long&#x00A0;end,const&#x00A0;int&#x00A0;thid);
&#x00A0;<br />reduceF&#x00A0;=R(T&amp;&#x00A0;var,const&#x00A0;T&amp;&#x00A0;elem);
</div>
<!--l. 311--><p class="nopar" > The <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">reduceF</span></span></span> function specified in all <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">parallel_reduce</span></span></span> methods, executes the
reduction operation.
<!--l. 316--><p class="indent" >   As an example, let&#8217;s consider the simple case of the sum of an array&#8217;s elements:
<!--l. 317-->
<div class="lstlisting" id="listing-29"><span class="tlabel"><a 
 id="x1-35001r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35002r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">arraysum</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35003r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35004r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">iostream</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35005r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_for</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35006r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35007r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">size</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">20;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35008r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[])</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35009r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35010r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[1])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35011r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">creates</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">array</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35012r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">A</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">[</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">];</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35013r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35014r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ParallelForReduce</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">double</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pfr</span><span 
class="cmr-7">(</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35015r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">fill</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">out</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">array</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">parallel</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">for</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35016r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pfr</span><span 
class="cmr-7">.</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_for</span><span 
class="cmr-7">(0,</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">,1,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[&amp;](</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">j</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">[</span><span 
class="cmr-7">j</span><span 
class="cmr-7">]=</span><span 
class="cmr-7">j</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">1.0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35017r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35018r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">auto</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">reduceF</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[](</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">elem</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">elem</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35019r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">auto</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">bodyF</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[&amp;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">](</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">j</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">[</span><span 
class="cmr-7">j</span><span 
class="cmr-7">];</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35020r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35021r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0.0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35022r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">nComputing</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">with</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">max</span><span 
class="cmr-7">(1,</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">/2)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35023r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">workers</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">default</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">static</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">scheduling</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35024r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pfr</span><span 
class="cmr-7">.</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_reduce</span><span 
class="cmr-7">(</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0.0,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0</span><span 
class="cmr-7">L</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35025r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">bodyF</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">reduceF</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">max</span><span 
class="cmr-7">(1,</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">/2)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35026r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35027r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35028r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35029r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0.0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35030r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Computing</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">with</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35031r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">workers</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">static</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">scheduling</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">with</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">interleaving</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1000</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35032r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pfr</span><span 
class="cmr-7">.</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_reduce</span><span 
class="cmr-7">_static</span><span 
class="cmr-7">(</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0.0,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1000,</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35033r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">bodyF</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">reduceF</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35034r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35035r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35036r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35037r37"></a><span 
class="cmr-7">37</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0.0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35038r38"></a><span 
class="cmr-7">38</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Computing</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">with</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nworkers</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35039r39"></a><span 
class="cmr-7">39</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">workers</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">dynamic</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">scheduling</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">chunk</span><span 
class="cmr-7">=1000</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35040r40"></a><span 
class="cmr-7">40</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pfr</span><span 
class="cmr-7">.</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_reduce</span><span 
class="cmr-7">(</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0.0,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1000,</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35041r41"></a><span 
class="cmr-7">41</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">bodyF</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">reduceF</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35042r42"></a><span 
class="cmr-7">42</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35043r43"></a><span 
class="cmr-7">43</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35044r44"></a><span 
class="cmr-7">44</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35045r45"></a><span 
class="cmr-7">45</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-35046r46"></a><span 
class="cmr-7">46</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 365--><p class="noindent" >in this simple test, we used a parallel-for for initialising the array <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">A</span></span></span>, and 3
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">parallel_reduce</span></span></span> calls for computing the final <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">sum</span></span></span> (the reduction variable) using
the default static scheduling, the static scheduling with interleaving and the dynamic
scheduling, respectively.
<!--l. 371--><p class="noindent" >
   <h4 class="subsectionHead"><span class="titlemark">4.2.3   </span> <a 
 id="x1-360004.2.3"></a><span 
class="cmti-10">ParallelForPipeReduce</span></h4>
<!--l. 373--><p class="noindent" >The <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ParallelForPipeReduce</span></span></span> uses a different skeleton implementation
of the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ParallelForReduce</span></span></span> pattern. The <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ParallelForPipeReduce</span></span></span>
computes a <span 
class="cmti-10">map </span>function and a sequential <span 
class="cmti-10">reduce </span>function in a <span 
class="cmti-10">pipeline</span>
fashion.
<!--l. 377--><p class="indent" >   This pattern is useful in cases in which the reduce function has to be computed
sequentially, for example because there are concurrent write accesses in some memory
locations (so they have to be serialised using a lock), or because the reduction
operator is not fully commutative. In these cases, the typical solution is to execute
the map part (for example using a parallel-for) and then when the map is completed,
execute the reduce part sequentially and this may be expensive because a full barrier
(between the map and the reduce) is required. The <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ParallelForPipeReduce</span></span></span>
pattern allows execution of the <span 
class="cmti-10">map </span>and <span 
class="cmti-10">reduce </span>part in pipeline without any barriers.
                                                                  

                                                                  
<!--l. 388--><p class="indent" >   The <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ParallelForPipeReduce</span></span></span> pattern is more complex to use than the
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ParallelForReduce</span></span></span> pattern because it requires to explicitly send the tasks to the
reduce stage inside the body of the <span 
class="cmti-10">map </span>function. The <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ParallelForPipeReduce</span></span></span>
class defined in the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">parallel_for.hpp</span></span></span> file provides only 2 parallel-for
methods:
                                                                  

                                                                  
   <div class="verbatim" id="verbatim-11">
parallel_for_idx(first,last,step,grain,
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;mapF,&#x00A0;nworkers);
&#x00A0;<br />mapF&#x00A0;&#x00A0;&#x00A0;&#x00A0;=F(const&#x00A0;long&#x00A0;begin,const&#x00A0;long&#x00A0;end,const&#x00A0;int&#x00A0;thid,
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;ff_buffernode&amp;&#x00A0;node);
&#x00A0;<br />
&#x00A0;<br />parallel_reduce_idx(first,last,step,grain,
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;mapF,&#x00A0;reduceF,&#x00A0;nworkers);
&#x00A0;<br />mapF&#x00A0;&#x00A0;&#x00A0;&#x00A0;=F(const&#x00A0;long&#x00A0;begin,const&#x00A0;long&#x00A0;end,const&#x00A0;int&#x00A0;thid,
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;ff_buffernode&amp;&#x00A0;node);
&#x00A0;<br />reduceF&#x00A0;=R(T&amp;&#x00A0;var);
</div>
<!--l. 405--><p class="nopar" >
<!--l. 408--><p class="indent" >   As an example, let&#8217;s consider the same simple case implemented in the previous
section, i.e. the computation of the sum of array&#8217;s elements: <!--l. 410-->
<div class="lstlisting" id="listing-30"><span class="tlabel"><a 
 id="x1-36001r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">***************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36002r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">arraysum2</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36003r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36004r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">define</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">HAS</span><span 
class="cmr-7">_CXX11</span><span 
class="cmr-7">_VARIADIC</span><span 
class="cmr-7">_TEMPLATES</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36005r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_for</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36006r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36007r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">size</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">20;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36008r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[])</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36009r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36010r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[1])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36011r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">creates</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">array</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36012r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">A</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">[</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">];</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36013r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ParallelForPipeReduce</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">double</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pfpipe</span><span 
class="cmr-7">(</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">,</span><span 
class="cmbx-7">true</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36014r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">init</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36015r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pfpipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_for</span><span 
class="cmr-7">_idx</span><span 
class="cmr-7">(0,</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">,1,0,</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36016r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[&amp;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">](</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">,</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stop</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36017r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">thid</span><span 
class="cmr-7">,</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_buffernode</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36018r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">j</span><span 
class="cmr-7">=</span><span 
class="cmr-7">start</span><span 
class="cmr-7">;</span><span 
class="cmr-7">j</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">stop</span><span 
class="cmr-7">;++</span><span 
class="cmr-7">j</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">[</span><span 
class="cmr-7">j</span><span 
class="cmr-7">]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">j</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">1.0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36019r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36020r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0.0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36021r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">auto</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mapF</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[&amp;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">](</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">,</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stop</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36022r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">thid</span><span 
class="cmr-7">,</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_buffernode</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36023r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">needed</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">avoid</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sending</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">spurious</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">lsum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">values</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">reduce</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36024r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">start</span><span 
class="cmr-7">==</span><span 
class="cmr-7">stop</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36025r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">lsum</span><span 
class="cmr-7">=</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">(0.0)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">allocate</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">a</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">send</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36026r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=</span><span 
class="cmr-7">start</span><span 
class="cmr-7">;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">stop</span><span 
class="cmr-7">;++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">lsum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">[</span><span 
class="cmr-7">i</span><span 
class="cmr-7">];</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36027r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">.</span><span 
class="cmr-7">put</span><span 
class="cmr-7">(</span><span 
class="cmr-7">lsum</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sending</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">partial</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">to</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">next</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">reduce</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36028r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36029r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">auto</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">reduceF</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[&amp;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">](</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">lsum</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">lsum</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">lsum</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36030r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Computing</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">with</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36031r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">workers</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ParallelForPipeReduce</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">and</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">default</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sched</span><span 
class="cmr-7">.</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36032r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pfpipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_reduce</span><span 
class="cmr-7">_idx</span><span 
class="cmr-7">(0,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mapF</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">reduceF</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36033r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36034r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36035r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-36036r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 448--><p class="noindent" >
<!--l. 450--><p class="noindent" >
   <h4 class="subsectionHead"><span class="titlemark">4.2.4   </span> <a 
 id="x1-370004.2.4"></a><span 
class="cmti-10">ff</span><span 
class="cmti-10">_map</span></h4>
<!--l. 452--><p class="noindent" >The <span 
class="cmss-10">FastFlow</span> <span 
class="cmti-10">map </span>parallel pattern is implemented as an <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> abstraction and a
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ParallelForReduce</span></span></span> pattern. The idea is that, the <span 
class="cmti-10">map </span>pattern is just an interface
to a parallel-for on multi-core platforms, while it provides a simple abstraction for
targeting multi-GPGPUs (both OpenCL and CUDA) and, in the future versions,
FPGAs on many-core platforms.
<!--l. 457--><p class="indent" >   Since the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_map</span></span></span> pattern is an <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span>, it may be used as a pipeline stage and
as a farm worker.
   <!--l. 459-->
<div class="lstlisting" id="listing-31"><span class="tlabel"><a 
 id="x1-37001r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">***************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37002r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">hello</span><span 
class="cmr-7">_map</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37003r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37004r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">define</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">HAS</span><span 
class="cmr-7">_CXX11</span><span 
class="cmr-7">_VARIADIC</span><span 
class="cmr-7">_TEMPLATES</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37005r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_for</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37006r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">pipeline</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37007r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37008r8"></a><span 
class="cmr-7">8</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">map</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37009r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmbx-7">using</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">namespace</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37010r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">100;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37011r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">type</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37012r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmbx-7">typedef</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">pair</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">,</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">long</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37013r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">this</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">worker</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37014r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mapWorker</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_Map</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37015r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37016r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37017r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">first</span><span 
class="cmr-7">.</span><span 
class="cmr-7">resize</span><span 
class="cmr-7">(</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37018r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">second</span><span 
class="cmr-7">.</span><span 
class="cmr-7">resize</span><span 
class="cmr-7">(</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37019r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myid</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">get</span><span 
class="cmr-7">_my</span><span 
class="cmr-7">_id</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37020r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_Map</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">::</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_for</span><span 
class="cmr-7">(0,</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">,[</span><span 
class="cmr-7">myid</span><span 
class="cmr-7">,&amp;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">](</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37021r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">first</span><span 
class="cmr-7">.</span><span 
class="cmbx-7">operator</span><span 
class="cmr-7">[](</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">myid</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37022r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">second</span><span 
class="cmr-7">.</span><span 
class="cmbx-7">operator</span><span 
class="cmr-7">[](</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">SIZE</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">i</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37023r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">,2)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">just</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">starts</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">worker</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">threads</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37024r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_send</span><span 
class="cmr-7">_out</span><span 
class="cmr-7">(</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37025r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">EOS</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37026r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37027r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37028r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">this</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">second</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37029r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmbx-7">struct</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mapStage</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_Map</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37030r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mapStage</span><span 
class="cmr-7">()</span><span 
class="cmr-7">:</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_Map</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_realNumCores</span><span 
class="cmr-7">()</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{}</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">it</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">uses</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">all</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">real</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">cores</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37031r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">svc</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37032r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">reinterpret</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">_t</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37033r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">this</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_for</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">provided</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">by</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_Map</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">class</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37034r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_Map</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">::</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_for</span><span 
class="cmr-7">(0,</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">,[&amp;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">](</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37035r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">first</span><span 
class="cmr-7">.</span><span 
class="cmbx-7">operator</span><span 
class="cmr-7">[](</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">second</span><span 
class="cmr-7">.</span><span 
class="cmbx-7">operator</span><span 
class="cmr-7">[](</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37036r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37037r37"></a><span 
class="cmr-7">37</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmr-7">size</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">;++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37038r38"></a><span 
class="cmr-7">38</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">first</span><span 
class="cmr-7">.</span><span 
class="cmbx-7">operator</span><span 
class="cmr-7">[](</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37039r39"></a><span 
class="cmr-7">39</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37040r40"></a><span 
class="cmr-7">40</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37041r41"></a><span 
class="cmr-7">41</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37042r42"></a><span 
class="cmr-7">42</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37043r43"></a><span 
class="cmr-7">43</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37044r44"></a><span 
class="cmr-7">44</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_node</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">W</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37045r45"></a><span 
class="cmr-7">45</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">W</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mapWorker</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37046r46"></a><span 
class="cmr-7">46</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">W</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mapWorker</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37047r47"></a><span 
class="cmr-7">47</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_farm</span><span 
class="cmmi-7">&#x003C;&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">(</span><span 
class="cmr-7">W</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37048r48"></a><span 
class="cmr-7">48</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cleanup</span><span 
class="cmr-7">_workers</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">memory</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">freed</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">at</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">termination</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37049r49"></a><span 
class="cmr-7">49</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mapStage</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37050r50"></a><span 
class="cmr-7">50</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">_t</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">(&amp;</span><span 
class="cmr-7">farm</span><span 
class="cmr-7">,&amp;</span><span 
class="cmr-7">stage</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37051r51"></a><span 
class="cmr-7">51</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37052r52"></a><span 
class="cmr-7">52</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37053r53"></a><span 
class="cmr-7">53</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-37054r54"></a><span 
class="cmr-7">54</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 515--><p class="noindent" >in the above test, we have a <span 
class="cmti-10">pipeline </span>of two stage, the first stage is a <span 
class="cmti-10">task-farm </span>having
two workers defined as <span 
class="cmti-10">map</span>, the second stage is a <span 
class="cmti-10">map</span>. The farm&#8217;s workers initialise
and generate in the output stream pairs of vector, the single pair of vector is summed
in the second stage.
<!--l. 521--><p class="indent" >   Why use the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_Map</span></span></span> instead of using directly a <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ParallelFor</span></span></span> in a sequential
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span>? The big difference is only in the fact that in case of <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_Map</span></span></span> the run-time
knows that the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> is internally parallel whereas if the parallel-for is used
inside the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">svc</span></span></span> method of a sequential <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_node</span></span></span> this information is completely
transparent to the <span 
class="cmss-10">FastFlow</span> run-time thus not allowing any kind of optimisation (as
for example, removing the scheduler or applying a better thread-to-core
mapping).
                                                                  

                                                                  
<!--l. 529--><p class="noindent" >
   <h3 class="sectionHead"><span class="titlemark">4.3   </span> <a 
 id="x1-380004.3"></a>Examples</h3>
<!--l. 531--><p class="noindent" >
   <h4 class="subsectionHead"><span class="titlemark">4.3.1   </span> <a 
 id="x1-390004.3.1"></a>Matrix multiplication</h4>
<!--l. 533--><p class="noindent" >Let&#8217;s consider the standard <span 
class="cmmi-10">ijk </span>matrix multiplication algorithm. We have three
nested loops that can be potentially parallelised (note that the internal <span 
class="cmmi-10">k</span>-loop is not
a plain parallel for loop). In the following code we apply the <span 
class="cmti-10">ParallelFor </span>pattern to
the outermost loop (<span 
class="cmmi-10">i</span>-loop). <!--l. 536-->
<div class="lstlisting" id="listing-32"><span class="tlabel"><a 
 id="x1-39001r1"></a><span 
class="cmr-7">1</span></span><span 
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class="cmr-7">matmul</span><span 
class="cmr-7">.</span><span 
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 id="x1-39014r14"></a><span 
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 id="x1-39019r19"></a><span 
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class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">long</span><span 
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 id="x1-39020r20"></a><span 
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 id="x1-39021r21"></a><span 
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 id="x1-39022r22"></a><span 
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 id="x1-39023r23"></a><span 
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 id="x1-39024r24"></a><span 
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 id="x1-39025r25"></a><span 
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 id="x1-39028r28"></a><span 
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 id="x1-39029r29"></a><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-39030r30"></a><span 
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class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-39031r31"></a><span 
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class="cmbx-7">void</span><span 
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class="cmbx-7">long</span><span 
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 id="x1-39032r32"></a><span 
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 id="x1-39072r72"></a><span 
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 id="x1-39073r73"></a><span 
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 id="x1-39074r74"></a><span 
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 id="x1-39075r75"></a><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">C</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-39077r77"></a><span 
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 id="x1-39078r78"></a><span 
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class="cmbx-7">void</span><span 
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class="cmr-7">&#x00A0;</span><span 
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 id="x1-39079r79"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-39080r80"></a><span 
class="cmr-7">80</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 619--><p class="noindent" >
   <h4 class="subsectionHead"><span class="titlemark">4.3.2   </span> <a 
 id="x1-400004.3.2"></a>Dot product</h4>
<!--l. 621--><p class="noindent" >The &#8221;dot&#8221; product is a simple example of a map pattern combined with
a reduction operation. The map is the initial pair wise multiplication of
vector elements, and the reduction is the summation of the results of that
multiplication.
<!--l. 625--><p class="indent" >   More formally, given two arrays <span 
class="cmmi-10">A </span>and <span 
class="cmmi-10">B </span>each with <span 
class="cmmi-10">n </span>elements, the dot product
<span 
class="cmmi-10">A </span><span 
class="cmsy-10">&#x00D7; </span><span 
class="cmmi-10">B </span>is the resulting scalar given by <span 
class="cmex-10">&#x2211;</span>
  <sub><span 
class="cmmi-7">i</span><span 
class="cmr-7">=0</span></sub><sup><span 
class="cmmi-7">n</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1</span></sup><span 
class="cmmi-10">A</span>[<span 
class="cmmi-10">i</span>] <span 
class="cmsy-10">&#x00D7; </span><span 
class="cmmi-10">B</span>[<span 
class="cmmi-10">i</span>].
   <!--l. 628-->
<div class="lstlisting" id="listing-33"><span class="tlabel"><a 
 id="x1-40001r1"></a><span 
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 id="x1-40002r2"></a><span 
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 id="x1-40003r3"></a><span 
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 id="x1-40005r5"></a><span 
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 id="x1-40006r6"></a><span 
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 id="x1-40011r11"></a><span 
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 id="x1-40012r12"></a><span 
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class="cmr-7">:</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmmi-7">&#x003C;&#x003C;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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 id="x1-40013r13"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40014r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40015r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">INITIAL</span><span 
class="cmr-7">_VALUE</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1.0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40016r16"></a><span 
class="cmr-7">16</span></span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[1])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40017r17"></a><span 
class="cmr-7">17</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">arraySize</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atol</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[2])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40018r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[3])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40019r19"></a><span 
class="cmr-7">19</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">chunk</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atol</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[4])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40020r20"></a><span 
class="cmr-7">20</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40021r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">nworkers</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">arraySize</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40022r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40023r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">creates</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">array</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40024r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">A</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">[</span><span 
class="cmr-7">arraySize</span><span 
class="cmr-7">];</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40025r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">B</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">[</span><span 
class="cmr-7">arraySize</span><span 
class="cmr-7">];</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40026r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40027r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ParallelForReduce</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">double</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pfr</span><span 
class="cmr-7">(</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">,</span><span 
class="cmbx-7">true</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40028r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40029r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">initialize</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">arrays</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">and</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">B</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40030r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pfr</span><span 
class="cmr-7">.</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_for</span><span 
class="cmr-7">(0,</span><span 
class="cmr-7">arraySize</span><span 
class="cmr-7">,1,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">chunk</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[&amp;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">,&amp;</span><span 
class="cmr-7">B</span><span 
class="cmr-7">](</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">j</span><span 
class="cmr-7">)</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40031r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">[</span><span 
class="cmr-7">j</span><span 
class="cmr-7">]=</span><span 
class="cmr-7">j</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">3.14;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">B</span><span 
class="cmr-7">[</span><span 
class="cmr-7">j</span><span 
class="cmr-7">]=2.1</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">j</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40032r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40033r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">final</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">reduce</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">function</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40034r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">auto</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Fsum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[](</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">v</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">elem</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">v</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">elem</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40035r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">reduction</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">variable</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40036r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">z</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">z</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">NTIMES</span><span 
class="cmr-7">;++</span><span 
class="cmr-7">z</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">repeats</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">computation</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">NTIMES</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40037r37"></a><span 
class="cmr-7">37</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">INITIAL</span><span 
class="cmr-7">_VALUE</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40038r38"></a><span 
class="cmr-7">38</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pfr</span><span 
class="cmr-7">.</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_reduce</span><span 
class="cmr-7">(</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0.0,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">arraySize</span><span 
class="cmr-7">,1,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">chunk</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40039r39"></a><span 
class="cmr-7">39</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[&amp;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">,&amp;</span><span 
class="cmr-7">B</span><span 
class="cmr-7">](</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">[</span><span 
class="cmr-7">i</span><span 
class="cmr-7">]</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">B</span><span 
class="cmr-7">[</span><span 
class="cmr-7">i</span><span 
class="cmr-7">];</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40040r40"></a><span 
class="cmr-7">40</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Fsum</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40041r41"></a><span 
class="cmr-7">41</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40042r42"></a><span 
class="cmr-7">42</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Result</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">setprecision</span><span 
class="cmr-7">(10)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40043r43"></a><span 
class="cmr-7">43</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">B</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40044r44"></a><span 
class="cmr-7">44</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-40045r45"></a><span 
class="cmr-7">45</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 677--><p class="noindent" >
   <h4 class="subsectionHead"><span class="titlemark">4.3.3   </span> <a 
 id="x1-410004.3.3"></a>Mandelbrot fractal</h4>
<!--l. 679--><p class="noindent" >A Mandelbrot set <span 
class="cmmi-10">M</span>, is defined by the set of complex numbers <span 
class="cmmi-10">c </span>such that:
   <center class="math-display" >
<img 
src="tutorial14x.png" alt="M  = {c : |Mk (c)| &#x003C; &#x221E;, &#x2200;k &#x2208; N }
" class="math-display" ></center>
<!--l. 680--><p class="nopar" > where
   <center class="par-math-display" >
<img 
src="tutorial15x.png" alt="{ M0 (c) = 0
  Mk+1 (c) = Mk (c)2 + c
" class="par-math-display" ></center>
<!--l. 687--><p class="nopar" >
<!--l. 689--><p class="noindent" >A point <span 
class="cmmi-10">c </span>belongs to the Mandelbrot set if and only if:
                                                                  

                                                                  
   <center class="math-display" >
<img 
src="tutorial16x.png" alt="|Mk (c)| &#x003C;= 2,&#x2200;k &#x2208; N
" class="math-display" ></center>
<!--l. 691--><p class="nopar" >
<!--l. 693--><p class="indent" >   The following program, which uses the <span 
class="cmti-10">ParallelForPipeReduce </span>pattern for both
computing the set line by line (<span 
class="cmti-10">Map </span>part) and for displaying the line just computed
(<span 
class="cmti-10">Reduce </span>part), displays the Mandelbrot set in a X window. The result is shown in
Fig&#x00A0;<a 
href="#x1-410011">4.1<!--tex4ht:ref: fig:ff:mandel --></a>.
<!--l. 697--><p class="indent" >   <hr class="figure"><div class="figure" 
>
                                                                  

                                                                  
<a 
 id="x1-410011"></a>
                                                                  

                                                                  
<div  
class="centerline">         <img 
src="tutorial17x.png" alt="PIC" class="graphics" width="224.2479pt" height="232.13632pt" ><!--tex4ht:graphics  
name="tutorial17x.png" src="figures/mandelbrot.eps"  
-->         </div>
<br /> <div class="caption" 
><span class="id">Figure&#x00A0;4.1: </span><span  
class="content">Mandelbrot set: size=800, niterations=400</span></div><!--tex4ht:tlabel?: x1-410011 -->
                                                                  

                                                                  
<!--l. 701--><p class="indent" >   </div><hr class="endfigure">
   <!--l. 703-->
<div class="lstlisting" id="listing-34"><span class="tlabel"><a 
 id="x1-41002r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
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class="cmsy-7">************************</span><span 
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class="cmr-7">/</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">mandel</span><span 
class="cmr-7">.</span><span 
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 id="x1-41006r5"></a><span 
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class="cmr-7">/</span><span 
class="cmr-7">utils</span><span 
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 id="x1-41010r9"></a><span 
class="cmr-7">9</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">define</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">HAS</span><span 
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 id="x1-41011r10"></a><span 
class="cmr-7">10</span></span><span 
class="cmbx-7">#</span><span 
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class="cmr-7">.</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41012r11"></a><span 
class="cmr-7">11</span></span><span 
class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">lib</span><span 
class="cmr-7">/</span><span 
class="cmr-7">marX2</span><span 
class="cmr-7">.</span><span 
class="cmr-7">h</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41013r12"></a><span 
class="cmr-7">12</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41014r13"></a><span 
class="cmr-7">13</span></span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">DIM</span><span 
class="cmr-7">=800;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">default</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">dimension</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41015r14"></a><span 
class="cmr-7">14</span></span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ITERATION</span><span 
class="cmr-7">=1024;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">default</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">iteration</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41016r15"></a><span 
class="cmr-7">15</span></span><span 
class="cmbx-7">const</span><span 
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class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">=</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">2.125,</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">1.5,</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">=3.0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41017r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmbx-7">using</span><span 
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class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
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 id="x1-41020r19"></a><span 
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 id="x1-41021r20"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">dim</span><span 
class="cmr-7">)</span><span 
class="cmr-7">:</span><span 
class="cmr-7">M</span><span 
class="cmr-7">(</span><span 
class="cmr-7">dim</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
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class="cmsy-7">-</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41022r21"></a><span 
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class="cmr-7">::</span><span 
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class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">unsigned</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41023r22"></a><span 
class="cmr-7">22</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">line</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41024r23"></a><span 
class="cmr-7">23</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41025r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">(</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">**</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41026r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">dim</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">DIM</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">niter</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ITERATION</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">retries</span><span 
class="cmr-7">=1,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">chunk</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41027r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">bool</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">scheduler</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">true</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41028r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">3)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41029r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">printf</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">nUsage</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">%</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">nworkers</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">size</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmr-7">niterations</span><span 
class="cmr-7">=1024]</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41030r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmr-7">retries</span><span 
class="cmr-7">=1]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmr-7">chunk</span><span 
class="cmr-7">=0]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[0</span><span 
class="cmsy-7">|</span><span 
class="cmr-7">1]</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[0])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41031r30"></a><span 
class="cmr-7">30</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41032r31"></a><span 
class="cmr-7">31</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41033r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[1])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41034r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">dim</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[2])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41035r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">=4)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">niter</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[3])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41036r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">=5)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">retries</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[4])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41037r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">=6)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">chunk</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[5])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41038r37"></a><span 
class="cmr-7">37</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">=7)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">scheduler</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[6])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41039r38"></a><span 
class="cmr-7">38</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">step</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">range</span><span 
class="cmr-7">/((</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">dim</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41040r39"></a><span 
class="cmr-7">39</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">runs</span><span 
class="cmr-7">[</span><span 
class="cmr-7">retries</span><span 
class="cmr-7">];</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41041r40"></a><span 
class="cmr-7">40</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41042r41"></a><span 
class="cmr-7">41</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">SetupXWindows</span><span 
class="cmr-7">(</span><span 
class="cmr-7">dim</span><span 
class="cmr-7">,</span><span 
class="cmr-7">dim</span><span 
class="cmr-7">,1,</span><span 
class="cmr-7">NULL</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">ParallelForPipeReduce</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Mandelbrot</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41043r42"></a><span 
class="cmr-7">42</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41044r43"></a><span 
class="cmr-7">43</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ParallelForPipeReduce</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ostream</span><span 
class="cmr-7">_t</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pfr</span><span 
class="cmr-7">(</span><span 
class="cmr-7">nworkers</span><span 
class="cmr-7">,</span><span 
class="cmbx-7">true</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41045r44"></a><span 
class="cmr-7">44</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41046r45"></a><span 
class="cmr-7">45</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">scheduler</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pfr</span><span 
class="cmr-7">.</span><span 
class="cmr-7">disableScheduler</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">false</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41047r46"></a><span 
class="cmr-7">46</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">map</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">lambda</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41048r47"></a><span 
class="cmr-7">47</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">auto</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Map</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[&amp;](</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">stop</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41049r48"></a><span 
class="cmr-7">48</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">thid</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_buffernode</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41050r49"></a><span 
class="cmr-7">49</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=</span><span 
class="cmr-7">start</span><span 
class="cmr-7">;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">stop</span><span 
class="cmr-7">;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">++)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41051r50"></a><span 
class="cmr-7">50</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">im</span><span 
class="cmr-7">=</span><span 
class="cmr-7">init</span><span 
class="cmr-7">_b</span><span 
class="cmr-7">+(</span><span 
class="cmr-7">step</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41052r51"></a><span 
class="cmr-7">51</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ostream</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">=</span><span 
class="cmbx-7">new</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ostream</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">(</span><span 
class="cmr-7">dim</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41053r52"></a><span 
class="cmr-7">52</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">j</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">j</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">dim</span><span 
class="cmr-7">;</span><span 
class="cmr-7">j</span><span 
class="cmr-7">++)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41054r53"></a><span 
class="cmr-7">53</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">a</span><span 
class="cmr-7">=</span><span 
class="cmr-7">init</span><span 
class="cmr-7">_a</span><span 
class="cmr-7">+</span><span 
class="cmr-7">step</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">j</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41055r54"></a><span 
class="cmr-7">54</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">b</span><span 
class="cmr-7">=</span><span 
class="cmr-7">im</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41056r55"></a><span 
class="cmr-7">55</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">cr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">a</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41057r56"></a><span 
class="cmr-7">56</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">k</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41058r57"></a><span 
class="cmr-7">57</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">k</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">niter</span><span 
class="cmr-7">;</span><span 
class="cmr-7">k</span><span 
class="cmr-7">++)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41059r58"></a><span 
class="cmr-7">58</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">a2</span><span 
class="cmr-7">=</span><span 
class="cmr-7">a</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">a</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41060r59"></a><span 
class="cmr-7">59</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">b2</span><span 
class="cmr-7">=</span><span 
class="cmr-7">b</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">b</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41061r60"></a><span 
class="cmr-7">60</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">((</span><span 
class="cmr-7">a2</span><span 
class="cmr-7">+</span><span 
class="cmr-7">b2</span><span 
class="cmr-7">)</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">4.0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">break</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41062r61"></a><span 
class="cmr-7">61</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">b</span><span 
class="cmr-7">=2</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">a</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">b</span><span 
class="cmr-7">+</span><span 
class="cmr-7">im</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41063r62"></a><span 
class="cmr-7">62</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">a</span><span 
class="cmr-7">=</span><span 
class="cmr-7">a2</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">b2</span><span 
class="cmr-7">+</span><span 
class="cmr-7">cr</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41064r63"></a><span 
class="cmr-7">63</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41065r64"></a><span 
class="cmr-7">64</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">M</span><span 
class="cmr-7">[</span><span 
class="cmr-7">j</span><span 
class="cmr-7">]=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">unsigned</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">255</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">((</span><span 
class="cmr-7">k</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">255/</span><span 
class="cmr-7">niter</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41066r65"></a><span 
class="cmr-7">65</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41067r66"></a><span 
class="cmr-7">66</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">line</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41068r67"></a><span 
class="cmr-7">67</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">node</span><span 
class="cmr-7">.</span><span 
class="cmr-7">put</span><span 
class="cmr-7">(</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41069r68"></a><span 
class="cmr-7">68</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41070r69"></a><span 
class="cmr-7">69</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41071r70"></a><span 
class="cmr-7">70</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">reduce</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">lambda</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41072r71"></a><span 
class="cmr-7">71</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">auto</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Reduce</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[&amp;](</span><span 
class="cmr-7">ostream</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">task</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41073r72"></a><span 
class="cmr-7">72</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ShowLine</span><span 
class="cmr-7">(</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">M</span><span 
class="cmr-7">.</span><span 
class="cmr-7">data</span><span 
class="cmr-7">()</span><span 
class="cmr-7">,</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">M</span><span 
class="cmr-7">.</span><span 
class="cmr-7">size</span><span 
class="cmr-7">()</span><span 
class="cmr-7">,</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">line</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41074r73"></a><span 
class="cmr-7">73</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41075r74"></a><span 
class="cmr-7">74</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41076r75"></a><span 
class="cmr-7">75</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">avg</span><span 
class="cmr-7">=0.0,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">var</span><span 
class="cmr-7">=0.0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41077r76"></a><span 
class="cmr-7">76</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">r</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">r</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">retries</span><span 
class="cmr-7">;</span><span 
class="cmr-7">r</span><span 
class="cmr-7">++)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41078r77"></a><span 
class="cmr-7">77</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ffTime</span><span 
class="cmr-7">(</span><span 
class="cmr-7">START</span><span 
class="cmr-7">_TIME</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41079r78"></a><span 
class="cmr-7">78</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pfr</span><span 
class="cmr-7">.</span><span 
class="cmr-7">parallel</span><span 
class="cmr-7">_reduce</span><span 
class="cmr-7">_idx</span><span 
class="cmr-7">(0,</span><span 
class="cmr-7">dim</span><span 
class="cmr-7">,1,</span><span 
class="cmr-7">chunk</span><span 
class="cmr-7">,</span><span 
class="cmr-7">Map</span><span 
class="cmr-7">,</span><span 
class="cmr-7">Reduce</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41080r79"></a><span 
class="cmr-7">79</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ffTime</span><span 
class="cmr-7">(</span><span 
class="cmr-7">STOP</span><span 
class="cmr-7">_TIME</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41081r80"></a><span 
class="cmr-7">80</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41082r81"></a><span 
class="cmr-7">81</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">avg</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">runs</span><span 
class="cmr-7">[</span><span 
class="cmr-7">r</span><span 
class="cmr-7">]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ffTime</span><span 
class="cmr-7">(</span><span 
class="cmr-7">GET</span><span 
class="cmr-7">_TIME</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41083r82"></a><span 
class="cmr-7">82</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cout</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Run</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">r</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">done</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">time</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">runs</span><span 
class="cmr-7">[</span><span 
class="cmr-7">r</span><span 
class="cmr-7">]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41084r83"></a><span 
class="cmr-7">83</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41085r84"></a><span 
class="cmr-7">84</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">avg</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">avg</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">retries</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41086r85"></a><span 
class="cmr-7">85</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">for</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">r</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">r</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">retries</span><span 
class="cmr-7">;</span><span 
class="cmr-7">r</span><span 
class="cmr-7">++)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-41087r86"></a><span 
class="cmr-7">86</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">var</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">runs</span><span 
class="cmr-7">[</span><span 
class="cmr-7">r</span><span 
class="cmr-7">]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">avg</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">runs</span><span 
class="cmr-7">[</span><span 
class="cmr-7">r</span><span 
class="cmr-7">]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">avg</span><span 
class="cmr-7">)</span><span 
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   </div>
   <h4 class="subsectionHead"><span class="titlemark">4.3.4   </span> <a 
 id="x1-420004.3.4"></a>Sobel filter</h4>
<!--l. 804--><p class="noindent" ><hr class="figure"><div class="figure" 
>
                                                                  

                                                                  
<a 
 id="x1-420012"></a>
                                                                  

                                                                  
<div  
class="centerline">         <img 
src="tutorial18x.png" alt="PIC" class="graphics" width="224.2479pt" height="155.6171pt" ><!--tex4ht:graphics  
name="tutorial18x.png" src="figures/leaningtower.eps"  
-->         </div>
<br /> <div class="caption" 
><span class="id">Figure&#x00A0;4.2: </span><span  
class="content">Sobel filter</span></div><!--tex4ht:tlabel?: x1-420012 -->
                                                                  

                                                                  
<!--l. 808--><p class="noindent" ></div><hr class="endfigure">
<!--l. 810--><p class="indent" >   Let&#8217;s consider a very simple usage example in which the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_map</span></span></span> is used as pipeline
stage for computing the Sobel filter (see Fig.&#x00A0;<a 
href="#x1-420012">4.2<!--tex4ht:ref: fig:sobel --></a>) on a stream of input images. The first
stage reads image from disk, allocates memory and then sends a task to the second
stage (the Map one) which computes the Sobel filter in parallel using a parallel-for.
Finally the image is written into the local disk. In the following code we used
OpenCV<span class="footnote-mark"><a 
href="tutorial6.html#fn1x7"><sup class="textsuperscript">1</sup></a></span><a 
 id="x1-42002f1"></a> 
for reading and writing images and for converting them to grayscale.
   <!--l. 817-->
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 id="x1-42042r40"></a><span 
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 id="x1-42043r41"></a><span 
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 id="x1-42083r81"></a><span 
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 id="x1-42084r82"></a><span 
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 id="x1-42085r83"></a><span 
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 id="x1-42086r84"></a><span 
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 id="x1-42087r85"></a><span 
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 id="x1-42088r86"></a><span 
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 id="x1-42089r87"></a><span 
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 id="x1-42090r88"></a><span 
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 id="x1-42091r89"></a><span 
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 id="x1-42108r106"></a><span 
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 id="x1-42109r107"></a><span 
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 id="x1-42110r108"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">of</span><span 
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class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42111r109"></a><span 
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 id="x1-42112r110"></a><span 
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class="cmr-7">sum</span><span 
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 id="x1-42113r111"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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 id="x1-42114r112"></a><span 
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class="cmr-7">+</span><span 
class="cmr-7">x</span><span 
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 id="x1-42115r113"></a><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42116r114"></a><span 
class="cmr-7">114</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42117r115"></a><span 
class="cmr-7">115</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">outfile</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">./</span><span 
class="cmr-7">out</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">name</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42118r116"></a><span 
class="cmr-7">116</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">imwrite</span><span 
class="cmr-7">(</span><span 
class="cmr-7">outfile</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">cv</span><span 
class="cmr-7">::</span><span 
class="cmr-7">Mat</span><span 
class="cmr-7">(</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">rows</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">cols</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">CV</span><span 
class="cmr-7">_8U</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">dst</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">cv</span><span 
class="cmr-7">::</span><span 
class="cmr-7">Mat</span><span 
class="cmr-7">::</span><span 
class="cmr-7">AUTO</span><span 
class="cmr-7">_STEP</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42119r117"></a><span 
class="cmr-7">117</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">src</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">dst</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">delete</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42120r118"></a><span 
class="cmr-7">118</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">GO</span><span 
class="cmr-7">_ON</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42121r119"></a><span 
class="cmr-7">119</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42122r120"></a><span 
class="cmr-7">120</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42123r121"></a><span 
class="cmr-7">121</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42124r122"></a><span 
class="cmr-7">122</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[])</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42125r123"></a><span 
class="cmr-7">123</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">2)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42126r124"></a><span 
class="cmr-7">124</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cerr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">nuse</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[0]</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42127r125"></a><span 
class="cmr-7">125</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">Wrks</span><span 
class="cmr-7">=2</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">]</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">file</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">[</span><span 
class="cmr-7">image</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">file</span><span 
class="cmr-7">]</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42128r126"></a><span 
class="cmr-7">126</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">cerr</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Wrks2</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">is</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">n</span><span 
class="cmr-7">.</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">of</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">map</span><span 
class="cmr-7">&#8217;</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">workers</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42129r127"></a><span 
class="cmr-7">127</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42130r128"></a><span 
class="cmr-7">128</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42131r129"></a><span 
class="cmr-7">129</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42132r130"></a><span 
class="cmr-7">130</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Wrks</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">MAPWORKERS</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42133r131"></a><span 
class="cmr-7">131</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">char</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">getOption</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">+</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">m</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42134r132"></a><span 
class="cmr-7">132</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">m</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Wrks</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">m</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">start</span><span 
class="cmr-7">+=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">=2;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42135r133"></a><span 
class="cmr-7">133</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">argc</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42136r134"></a><span 
class="cmr-7">134</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42137r135"></a><span 
class="cmr-7">135</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42138r136"></a><span 
class="cmr-7">136</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Read</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">reader</span><span 
class="cmr-7">(&amp;</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[</span><span 
class="cmr-7">start</span><span 
class="cmr-7">],</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">num</span><span 
class="cmr-7">_images</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42139r137"></a><span 
class="cmr-7">137</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">SobelStage</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sobel</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Wrks</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42140r138"></a><span 
class="cmr-7">138</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_pipe</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">Task</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">(&amp;</span><span 
class="cmr-7">reader</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">sobel</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42141r139"></a><span 
class="cmr-7">139</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">pipe</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42142r140"></a><span 
class="cmr-7">140</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pipeline</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42143r141"></a><span 
class="cmr-7">141</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42144r142"></a><span 
class="cmr-7">142</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42145r143"></a><span 
class="cmr-7">143</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-42146r144"></a><span 
class="cmr-7">144</span></span><span 
class="cmsy-7">}</span>
   </div>
                                                                  

                                                                  
   <h2 class="chapterHead"><span class="titlemark">Chapter&#x00A0;5</span><br /><a 
 id="x1-430005"></a>Data-flow parallelism</h2>
<!--l. 4--><p class="noindent" >The <span 
class="cmti-10">data-flow </span>programming model is a general approach to parallelization based
upon data dependencies among a program&#8217;s operations. Its theoretical and
methodological value is quite fundamental in parallel processing.
<!--l. 8--><p class="indent" >   The computations is expressed by the data-flow graph, i.e. a DAG whose nodes
are instructions and arcs are pure data dependencies.
<!--l. 11--><p class="indent" >   <hr class="figure"><div class="figure" 
>
                                                                  

                                                                  
<a 
 id="x1-430011"></a>
                                                                  

                                                                  
<div  
class="centerline">                     <img 
src="tutorial19x.png" alt="PIC" class="graphics" width="103.50105pt" height="131.6325pt" ><!--tex4ht:graphics  
name="tutorial19x.png" src="figures/data-flow.eps"  
-->                     </div>
<br /> <div class="caption" 
><span class="id">Figure&#x00A0;5.1: </span><span  
class="content">Data-flow dependency graph</span></div><!--tex4ht:tlabel?: x1-430011 -->
                                                                  

                                                                  
<!--l. 15--><p class="indent" >   </div><hr class="endfigure">
<!--l. 17--><p class="indent" >   If instead of simple instructions, portions of code (sets of instructions or
functions) are used as graph&#8217;s nodes, then it is called the macro data-flow model
(MDF). The resulting MDF program is therefore represented as a graph whose nodes
are computational kernels and arcs <span 
class="cmti-10">read-after-write </span>dependencies. It is worth noting
that, the data-flow programming model is able to work both on stream of values and
on a single value. For this reason, it is considered somehow a primitive model of
computation.
   <h3 class="sectionHead"><span class="titlemark">5.1   </span> <a 
 id="x1-440005.1"></a>The <span 
class="cmti-10">ff</span><span 
class="cmti-10">_mdf  </span>data-flow skeleton</h3>
<!--l. 25--><p class="noindent" >The <span 
class="cmti-10">mdf </span>skeleton in <span 
class="cmss-10">FastFlow</span> calles <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ff_mdf</span></span></span> implements the <span 
class="cmti-10">macro data-flow </span>parallel
pattern. The run-time of the <span 
class="cmss-10">FastFlow</span> mdf pattern is responsible for scheduling
<span 
class="cmti-10">fireable </span>instructions (i.e. those with all input data dependencies ready) and managing
data dependencies.
<!--l. 29--><p class="indent" >   Currently, the internal implementation of the <span 
class="cmss-10">FastFlow</span> mdf pattern is a 2-stage
pipeline, the first stage is responsible for dynamically generating the graph
instructions by executing the users&#8217; code, and the second stage (a task-farm with
feedback channel) is responsible for managing task dependencies and task scheduling.
In the next version of <span 
class="cmss-10">FastFlow</span>, other different implementations using less resources
will be provided to the users.
<div class="center" 
>
<!--l. 35--><p class="noindent" >
<!--l. 58--><p class="noindent" ><span class="framebox-c" 
style="width:34.49em;"><div class="minipage"><h5 class="likesubsubsectionHead"><a 
 id="x1-450005.1"></a><span 
class="cmssi-8">ff</span><span 
class="cmssi-8">_mdf  </span><span 
class="cmss-8">run-time components:</span></h5>
<!--l. 58--><p class="noindent" ><span 
class="cmss-8">At the general level, it is possible to identify the following main parts of the</span> <span 
class="cmss-8">FastFlow</span> <span 
class="cmss-8">mdf</span>
<span 
class="cmss-8">run-time:</span>
     <ul class="itemize1">
     <li class="itemize"><span 
class="cmss-8">Dynamic construction of the task graph (DAG): in complex program the task</span>
     <span 
class="cmss-8">graph  could  be  very  large;  its  generation  time  can  affect  significantly  the</span>
     <span 
class="cmss-8">computation time, and the memory required to store the entire graph may be</span>
     <span 
class="cmss-8">extremely large. To overcome these issues, a solution is to generate the graph</span>
     <span 
class="cmss-8">during the computation of tasks (and possibly overlap task generation and task</span>
     <span 
class="cmss-8">computation), such that only a window of the graph is maintained in memory.</span>
     </li>
     <li class="itemize"><span 
class="cmss-8">Handling  inter-task  dependencies:  Handling  task  dependencies,  i.e.  update</span>
     <span 
class="cmss-8">dependencies after the completion of previously scheduled tasks and determining</span>
     <span 
class="cmss-8">ready (fireable) tasks to be executed.</span>
     </li>
     <li class="itemize"><span 
class="cmss-8">Scheduling of fireable tasks: a task having all input dependencies ready may be</span>
     <span 
class="cmss-8">selected by the interpreter for execution. This selection needs to be performed in a</span>
     <span 
class="cmss-8">smart way in order to optimise cache locality, particular important on shared-cache</span>
     <span 
class="cmss-8">multi-core, and at the same time trying to maintain a good load balancing among</span>
     <span 
class="cmss-8">worker threads.</span></li></ul>                                            </div> </span></div>
                                                                  

                                                                  
<!--l. 61--><p class="noindent" >
   <h5 class="likesubsubsectionHead"><a 
 id="x1-460005.1"></a><span 
class="cmti-10">Creating graph tasks</span></h5>
<!--l. 63--><p class="noindent" >In order to show how to use the <span 
class="cmti-10">mdf </span>pattern, let&#8217;s take a look at the following simple
case. Suppose you have the following sequential code:
   <!--l. 66-->
<div class="lstlisting" id="listing-36"><span class="tlabel"><a 
 id="x1-46001r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">size</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">20;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46002r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">A</span><span 
class="cmr-7">,</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">B</span><span 
class="cmr-7">,</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">C</span><span 
class="cmr-7">,</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">D</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46003r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">allocate</span><span 
class="cmr-7">(</span><span 
class="cmr-7">A</span><span 
class="cmr-7">,</span><span 
class="cmr-7">B</span><span 
class="cmr-7">,</span><span 
class="cmr-7">C</span><span 
class="cmr-7">,</span><span 
class="cmr-7">D</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">size</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46004r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmr-7">sum2</span><span 
class="cmr-7">(</span><span 
class="cmr-7">A</span><span 
class="cmr-7">,</span><span 
class="cmr-7">B</span><span 
class="cmr-7">,</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executes</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">B</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46005r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmr-7">sum2</span><span 
class="cmr-7">(</span><span 
class="cmr-7">C</span><span 
class="cmr-7">,</span><span 
class="cmr-7">B</span><span 
class="cmr-7">,</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executes</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">C</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">C</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">B</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46006r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmr-7">sum2</span><span 
class="cmr-7">(</span><span 
class="cmr-7">D</span><span 
class="cmr-7">,</span><span 
class="cmr-7">B</span><span 
class="cmr-7">,</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executes</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">D</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">D</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">B</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46007r7"></a><span 
class="cmr-7">7</span></span><span 
class="cmr-7">sum3</span><span 
class="cmr-7">(</span><span 
class="cmr-7">D</span><span 
class="cmr-7">,</span><span 
class="cmr-7">A</span><span 
class="cmr-7">,</span><span 
class="cmr-7">C</span><span 
class="cmr-7">,</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">executes</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">D</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">C</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">D</span><span 
class="cmr-7">;</span>
   </div>
<!--l. 75--><p class="noindent" >here we can identify 4 macro instructions that can be executed concurrently with the
<span 
class="cmss-10">FastFlow</span> mdf pattern by specifying, for each instruction, which are the input or
output parameters of the function that has to be executed (in this case <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">sum2</span></span></span>
and <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">sum3</span></span></span>). For example, the first instruction in the code above has two
input parameters (<span 
class="cmmi-10">A </span>and <span 
class="cmmi-10">B</span>) and one output parameter (<span 
class="cmmi-10">C</span>) that have to be
passed to the function <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">sum2</span></span></span>. A parameter is provided to the run-time as
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">param_info</span></span></span> type, which has two fields, one is the pointer of the input
or output of the &#8221;real&#8221; parameter and the second is the &#8221;<span 
class="cmti-10">direction</span>&#8221; which
can be <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">INPUT</span></span></span>,<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">OUTPUT</span></span></span> or <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">VALUE</span></span></span> (this last one is used mainly for those
parameters that can be evaluated as a single value, do not constitute a real
dependency). The function and the parameters are passed to the run-time using
the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">AddTask</span></span></span> method of the <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">mdf</span></span></span> class. The resulting code is the following
one:
   <!--l. 88-->
<div class="lstlisting" id="listing-37"><span class="tlabel"><a 
 id="x1-46008r1"></a><span 
class="cmr-7">1</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">***************************</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46009r2"></a><span 
class="cmr-7">2</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*******</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">hello</span><span 
class="cmr-7">_mdf</span><span 
class="cmr-7">.</span><span 
class="cmr-7">cpp</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*****</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46010r3"></a><span 
class="cmr-7">3</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46011r4"></a><span 
class="cmr-7">4</span></span><span 
class="cmr-7">/</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_</span><span 
class="cmr-7">_</span><span 
class="cmr-7">_</span><span 
class="cmr-7">_</span><span 
class="cmr-7">_</span><span 
class="cmr-7">_</span><span 
class="cmr-7">_</span><span 
class="cmr-7">_</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46012r5"></a><span 
class="cmr-7">5</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">/</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46013r6"></a><span 
class="cmr-7">6</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46023r16"></a><span 
class="cmr-7">16</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
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 id="x1-46024r17"></a><span 
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class="cmbx-7">#</span><span 
class="cmbx-7">include</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">/</span><span 
class="cmr-7">mdf</span><span 
class="cmr-7">.</span><span 
class="cmr-7">hpp</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46025r18"></a><span 
class="cmr-7">18</span></span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">size</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">1</span><span 
class="cmmi-7">&#x003C;&#x003C;</span><span 
class="cmr-7">20;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46026r19"></a><span 
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class="cmbx-7">long</span><span 
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class="cmsy-7">*</span><span 
class="cmr-7">B</span><span 
class="cmr-7">,</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">C</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46027r20"></a><span 
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 id="x1-46028r21"></a><span 
class="cmr-7">21</span></span><span 
class="cmbx-7">void</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">taskGen</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46029r22"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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 id="x1-46030r23"></a><span 
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class="cmr-7">=</span><span 
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 id="x1-46031r24"></a><span 
class="cmr-7">24</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">auto</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
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 id="x1-46032r25"></a><span 
class="cmr-7">25</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">;</span><span 
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 id="x1-46033r26"></a><span 
class="cmr-7">26</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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 id="x1-46034r27"></a><span 
class="cmr-7">27</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46035r28"></a><span 
class="cmr-7">28</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_1</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">A</span><span 
class="cmr-7">,</span><span 
class="cmr-7">INPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46036r29"></a><span 
class="cmr-7">29</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_2</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">B</span><span 
class="cmr-7">,</span><span 
class="cmr-7">INPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">nd</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46037r30"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">_info</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_3</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">A</span><span 
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class="cmr-7">OUTPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">3</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46038r31"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">parameters</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">one</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">single</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">vector</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46039r32"></a><span 
class="cmr-7">32</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmr-7">_1</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
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class="cmr-7">(</span><span 
class="cmr-7">_2</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46040r33"></a><span 
class="cmr-7">33</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
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class="cmr-7">(</span><span 
class="cmr-7">_3</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46041r34"></a><span 
class="cmr-7">34</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mdf</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">AddTask</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum2</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">,</span><span 
class="cmr-7">B</span><span 
class="cmr-7">,</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">create</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">on</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46042r35"></a><span 
class="cmr-7">35</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46043r36"></a><span 
class="cmr-7">36</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">C</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">C</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">B</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46044r37"></a><span 
class="cmr-7">37</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46045r38"></a><span 
class="cmr-7">38</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">.</span><span 
class="cmr-7">clear</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46046r39"></a><span 
class="cmr-7">39</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_1</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">C</span><span 
class="cmr-7">,</span><span 
class="cmr-7">INPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46047r40"></a><span 
class="cmr-7">40</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_2</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">B</span><span 
class="cmr-7">,</span><span 
class="cmr-7">INPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46048r41"></a><span 
class="cmr-7">41</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_3</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">C</span><span 
class="cmr-7">,</span><span 
class="cmr-7">OUTPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46049r42"></a><span 
class="cmr-7">42</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmr-7">_1</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmr-7">_2</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmr-7">_3</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46050r43"></a><span 
class="cmr-7">43</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mdf</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">AddTask</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum2</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">C</span><span 
class="cmr-7">,</span><span 
class="cmr-7">B</span><span 
class="cmr-7">,</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46051r44"></a><span 
class="cmr-7">44</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46052r45"></a><span 
class="cmr-7">45</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">D</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">D</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">B</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46053r46"></a><span 
class="cmr-7">46</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46054r47"></a><span 
class="cmr-7">47</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">clear</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46055r48"></a><span 
class="cmr-7">48</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_1</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">D</span><span 
class="cmr-7">,</span><span 
class="cmr-7">INPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46056r49"></a><span 
class="cmr-7">49</span></span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_2</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">B</span><span 
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class="cmr-7">INPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46057r50"></a><span 
class="cmr-7">50</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_3</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">D</span><span 
class="cmr-7">,</span><span 
class="cmr-7">OUTPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46058r51"></a><span 
class="cmr-7">51</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
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class="cmr-7">(</span><span 
class="cmr-7">_1</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
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class="cmr-7">(</span><span 
class="cmr-7">_2</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
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class="cmr-7">(</span><span 
class="cmr-7">_3</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46059r52"></a><span 
class="cmr-7">52</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mdf</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">AddTask</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum2</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">D</span><span 
class="cmr-7">,</span><span 
class="cmr-7">B</span><span 
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class="cmr-7">SIZE</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46060r53"></a><span 
class="cmr-7">53</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46061r54"></a><span 
class="cmr-7">54</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">D</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">C</span><span 
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class="cmr-7">+</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">D</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46062r55"></a><span 
class="cmr-7">55</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46063r56"></a><span 
class="cmr-7">56</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">clear</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46064r57"></a><span 
class="cmr-7">57</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_1</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">A</span><span 
class="cmr-7">,</span><span 
class="cmr-7">INPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46065r58"></a><span 
class="cmr-7">58</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_2</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">C</span><span 
class="cmr-7">,</span><span 
class="cmr-7">INPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46066r59"></a><span 
class="cmr-7">59</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_3</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">D</span><span 
class="cmr-7">,</span><span 
class="cmr-7">INPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46067r60"></a><span 
class="cmr-7">60</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_4</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">D</span><span 
class="cmr-7">,</span><span 
class="cmr-7">OUTPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46068r61"></a><span 
class="cmr-7">61</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmr-7">_1</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmr-7">_2</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46069r62"></a><span 
class="cmr-7">62</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
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class="cmr-7">(</span><span 
class="cmr-7">_3</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmr-7">_4</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46070r63"></a><span 
class="cmr-7">63</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mdf</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">AddTask</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">sum3</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">D</span><span 
class="cmr-7">,</span><span 
class="cmr-7">A</span><span 
class="cmr-7">,</span><span 
class="cmr-7">C</span><span 
class="cmr-7">,</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46071r64"></a><span 
class="cmr-7">64</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46072r65"></a><span 
class="cmr-7">65</span></span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46073r66"></a><span 
class="cmr-7">66</span></span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">main</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46074r67"></a><span 
class="cmr-7">67</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">allocate</span><span 
class="cmr-7">(</span><span 
class="cmr-7">A</span><span 
class="cmr-7">,</span><span 
class="cmr-7">B</span><span 
class="cmr-7">,</span><span 
class="cmr-7">C</span><span 
class="cmr-7">,</span><span 
class="cmr-7">D</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">SIZE</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46075r68"></a><span 
class="cmr-7">68</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">creates</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mdf</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">object</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">passing</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">the</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">generetor</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">function</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46076r69"></a><span 
class="cmr-7">69</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_mdf</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">dag</span><span 
class="cmr-7">(</span><span 
class="cmr-7">taskGen</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46077r70"></a><span 
class="cmr-7">70</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46078r71"></a><span 
class="cmr-7">71</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">dag</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">error</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">running</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mdf</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46079r72"></a><span 
class="cmr-7">72</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-46080r73"></a><span 
class="cmr-7">73</span></span><span 
class="cmsy-7">}</span>
   </div>
<!--l. 164--><p class="noindent" >
   <h3 class="sectionHead"><span class="titlemark">5.2   </span> <a 
 id="x1-470005.2"></a>Examples</h3>
<!--l. 166--><p class="noindent" >In this section we propose two numerical application: the block-based matrix
multiplication and the block-based Cholesky factorisation.
<!--l. 169--><p class="noindent" >
   <h4 class="subsectionHead"><span class="titlemark">5.2.1   </span> <a 
 id="x1-480005.2.1"></a>Block-based matrix multiplication</h4>
<!--l. 171--><p class="noindent" >As a more complex usage example of the <span 
class="cmss-10">FastFlow</span> mdf pattern we consider here the
block-based matrix multiplication algorithm. The algorithm is sketched in
Fig.&#x00A0;<a 
href="#x1-480012">5.2<!--tex4ht:ref: fig:blockmm --></a>.
<!--l. 175--><p class="indent" >   This version computes in parallel the <span 
class="cmmi-10">C</span><sub><span 
class="cmmi-7">ij</span></sub> blocks doing <span 
class="cmmi-10">p</span>-passes. A more
cache-friendly implementation can be implemented.
<!--l. 178--><p class="indent" >   <hr class="figure"><div class="figure" 
>
                                                                  

                                                                  
<a 
 id="x1-480012"></a>
                                                                  

                                                                  
<div  
class="centerline"><img 
src="tutorial20x.png" alt="PIC" class="graphics" width="327.74895pt" height="169.29964pt" ><!--tex4ht:graphics  
name="tutorial20x.png" src="figures/matmul.eps"  
--></div>
<br /> <div class="caption" 
><span class="id">Figure&#x00A0;5.2: </span><span  
class="content">Block-based matmul algorithm</span></div><!--tex4ht:tlabel?: x1-480012 -->
                                                                  

                                                                  
<!--l. 183--><p class="indent" >   </div><hr class="endfigure">
   <!--l. 185-->
<div class="lstlisting" id="listing-38"><span class="tlabel"><a 
 id="x1-48002r1"></a><span 
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 id="x1-48023r22"></a><span 
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 id="x1-48024r23"></a><span 
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 id="x1-48025r24"></a><span 
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 id="x1-48028r27"></a><span 
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 id="x1-48048r47"></a><span 
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 id="x1-48050r49"></a><span 
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 id="x1-48052r51"></a><span 
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 id="x1-48062r61"></a><span 
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 id="x1-48064r63"></a><span 
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 id="x1-48066r65"></a><span 
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 id="x1-48068r67"></a><span 
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class="cmr-7">j</span><span 
class="cmr-7">)</span><span 
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class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48069r68"></a><span 
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class="cmr-7">::</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Param</span><span 
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 id="x1-48070r69"></a><span 
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class="cmbx-7">const</span><span 
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class="cmr-7">param</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_1</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">Cij</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">INPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48071r70"></a><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_2</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
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class="cmr-7">,</span><span 
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class="cmr-7">OUTPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48072r71"></a><span 
class="cmr-7">71</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmr-7">_1</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
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class="cmr-7">(</span><span 
class="cmr-7">_2</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48073r72"></a><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">//</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">create</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">a</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">task</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48074r73"></a><span 
class="cmr-7">73</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mdf</span><span 
class="cmsy-7">-</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">AddTask</span><span 
class="cmr-7">(</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">zerosBlock</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">b</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Cij</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">CN</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48075r74"></a><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48076r75"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48077r76"></a><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">k</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">k</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">pblocks</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">k</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48078r77"></a><span 
class="cmr-7">77</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">i</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">mblocks</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">i</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48079r78"></a><span 
class="cmr-7">78</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">(</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">j</span><span 
class="cmr-7">=0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">j</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">nblocks</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">++</span><span 
class="cmr-7">j</span><span 
class="cmr-7">)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48080r79"></a><span 
class="cmr-7">79</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">Aik</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">A</span><span 
class="cmr-7">[</span><span 
class="cmr-7">b</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">(</span><span 
class="cmr-7">i</span><span 
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class="cmr-7">AN</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">k</span><span 
class="cmr-7">)</span><span 
class="cmr-7">];</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48081r80"></a><span 
class="cmr-7">80</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">Bkj</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">B</span><span 
class="cmr-7">[</span><span 
class="cmr-7">b</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">(</span><span 
class="cmr-7">k</span><span 
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class="cmr-7">BN</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">+</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">j</span><span 
class="cmr-7">)</span><span 
class="cmr-7">];</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48082r81"></a><span 
class="cmr-7">81</span></span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">Cij</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">C</span><span 
class="cmr-7">[</span><span 
class="cmr-7">b</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">(</span><span 
class="cmr-7">i</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">CN</span><span 
class="cmr-7">+</span><span 
class="cmr-7">j</span><span 
class="cmr-7">)</span><span 
class="cmr-7">];</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48083r82"></a><span 
class="cmr-7">82</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">vector</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48084r83"></a><span 
class="cmr-7">83</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_1</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">Aik</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">INPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48085r84"></a><span 
class="cmr-7">84</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_2</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">Bkj</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">INPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48086r85"></a><span 
class="cmr-7">85</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">param</span><span 
class="cmr-7">_info</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">_3</span><span 
class="cmr-7">=</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">(</span><span 
class="cmr-7">uintptr</span><span 
class="cmr-7">_t</span><span 
class="cmr-7">)</span><span 
class="cmr-7">Cij</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">OUTPUT</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48087r86"></a><span 
class="cmr-7">86</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">push</span><span 
class="cmr-7">_back</span><span 
class="cmr-7">(</span><span 
class="cmr-7">_1</span><span 
class="cmr-7">)</span><span 
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class="cmr-7">&#x00A0;</span><span 
class="cmr-7">N</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">and</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">P</span><span 
class="cmr-7">.</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48106r105"></a><span 
class="cmr-7">105</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48107r106"></a><span 
class="cmr-7">106</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48108r107"></a><span 
class="cmr-7">107</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nw</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">1;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48109r108"></a><span 
class="cmr-7">108</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">M</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">parse</span><span 
class="cmr-7">_arg</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[1])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48110r109"></a><span 
class="cmr-7">109</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">N</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">parse</span><span 
class="cmr-7">_arg</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[2])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48111r110"></a><span 
class="cmr-7">110</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">P</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">parse</span><span 
class="cmr-7">_arg</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[3])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48112r111"></a><span 
class="cmr-7">111</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">long</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">b</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">parse</span><span 
class="cmr-7">_arg</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[4])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48113r112"></a><span 
class="cmr-7">112</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">6)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">nw</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[5])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48114r113"></a><span 
class="cmr-7">113</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argc</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">7)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48115r114"></a><span 
class="cmr-7">114</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">std</span><span 
class="cmr-7">::</span><span 
class="cmr-7">string</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pfarg</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[6])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48116r115"></a><span 
class="cmr-7">115</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">int</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">pfarg</span><span 
class="cmr-7">.</span><span 
class="cmr-7">find</span><span 
class="cmr-7">_first</span><span 
class="cmr-7">_of</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">:</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48117r116"></a><span 
class="cmr-7">116</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">if</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">n</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">0)</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">{</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48118r117"></a><span 
class="cmr-7">117</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">PFWORKERS</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">pfarg</span><span 
class="cmr-7">.</span><span 
class="cmr-7">substr</span><span 
class="cmr-7">(0,</span><span 
class="cmr-7">n</span><span 
class="cmr-7">)</span><span 
class="cmr-7">.</span><span 
class="cmr-7">c</span><span 
class="cmr-7">_str</span><span 
class="cmr-7">()</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48119r118"></a><span 
class="cmr-7">118</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">PFGRAIN</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">pfarg</span><span 
class="cmr-7">.</span><span 
class="cmr-7">substr</span><span 
class="cmr-7">(</span><span 
class="cmr-7">n</span><span 
class="cmr-7">+1)</span><span 
class="cmr-7">.</span><span 
class="cmr-7">c</span><span 
class="cmr-7">_str</span><span 
class="cmr-7">()</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48120r119"></a><span 
class="cmr-7">119</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">else</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">PFWORKERS</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">atoi</span><span 
class="cmr-7">(</span><span 
class="cmr-7">argv</span><span 
class="cmr-7">[6])</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48121r120"></a><span 
class="cmr-7">120</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">}</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48122r121"></a><span 
class="cmr-7">121</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">A</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">double</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">malloc</span><span 
class="cmr-7">(</span><span 
class="cmr-7">M</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">P</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">sizeof</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48123r122"></a><span 
class="cmr-7">122</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">B</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">double</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">malloc</span><span 
class="cmr-7">(</span><span 
class="cmr-7">P</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">N</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">sizeof</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48124r123"></a><span 
class="cmr-7">123</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">A</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">assert</span><span 
class="cmr-7">(</span><span 
class="cmr-7">B</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48125r124"></a><span 
class="cmr-7">124</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48126r125"></a><span 
class="cmr-7">125</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">random</span><span 
class="cmr-7">_init</span><span 
class="cmr-7">(</span><span 
class="cmr-7">M</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">N</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">P</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">double</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">A</span><span 
class="cmr-7">)</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">const</span><span 
class="cmbx-7">_cast</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmbx-7">double</span><span 
class="cmsy-7">*</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">B</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48127r126"></a><span 
class="cmr-7">126</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">C</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">=</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">double</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">malloc</span><span 
class="cmr-7">(</span><span 
class="cmr-7">M</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">N</span><span 
class="cmsy-7">*</span><span 
class="cmbx-7">sizeof</span><span 
class="cmr-7">(</span><span 
class="cmbx-7">double</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48128r127"></a><span 
class="cmr-7">127</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48129r128"></a><span 
class="cmr-7">128</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Parameters</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_mdf</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmmi-7">&#x003E;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">(</span><span 
class="cmr-7">A</span><span 
class="cmr-7">,</span><span 
class="cmr-7">B</span><span 
class="cmr-7">,</span><span 
class="cmr-7">C</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48130r129"></a><span 
class="cmr-7">129</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_mdf</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mdf</span><span 
class="cmr-7">(</span><span 
class="cmr-7">taskGen</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&amp;</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">,32,(</span><span 
class="cmr-7">nw</span><span 
class="cmmi-7">&#x003C;</span><span 
class="cmr-7">=0?</span><span 
class="cmr-7">ff</span><span 
class="cmr-7">_realNumCores</span><span 
class="cmr-7">()</span><span 
class="cmr-7">:</span><span 
class="cmr-7">nw</span><span 
class="cmr-7">)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48131r130"></a><span 
class="cmr-7">130</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">m</span><span 
class="cmr-7">=</span><span 
class="cmr-7">M</span><span 
class="cmr-7">,</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">n</span><span 
class="cmr-7">=</span><span 
class="cmr-7">N</span><span 
class="cmr-7">,</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">p</span><span 
class="cmr-7">=</span><span 
class="cmr-7">P</span><span 
class="cmr-7">,</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">b</span><span 
class="cmr-7">=</span><span 
class="cmr-7">b</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48132r131"></a><span 
class="cmr-7">131</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">AN</span><span 
class="cmr-7">=</span><span 
class="cmr-7">P</span><span 
class="cmr-7">,</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">BN</span><span 
class="cmr-7">=</span><span 
class="cmr-7">N</span><span 
class="cmr-7">,</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">CN</span><span 
class="cmr-7">=</span><span 
class="cmr-7">N</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48133r132"></a><span 
class="cmr-7">132</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Param</span><span 
class="cmr-7">.</span><span 
class="cmr-7">mdf</span><span 
class="cmr-7">=&amp;</span><span 
class="cmr-7">mdf</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48134r133"></a><span 
class="cmr-7">133</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">printf</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Executing</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">%</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">40</span><span 
class="cmr-7">s</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">Block</span><span 
class="cmsy-7">-</span><span 
class="cmr-7">based</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">MM</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48135r134"></a><span 
class="cmr-7">134</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ffTime</span><span 
class="cmr-7">(</span><span 
class="cmr-7">START</span><span 
class="cmr-7">_TIME</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48136r135"></a><span 
class="cmr-7">135</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">mdf</span><span 
class="cmr-7">.</span><span 
class="cmr-7">run</span><span 
class="cmr-7">_and</span><span 
class="cmr-7">_wait</span><span 
class="cmr-7">_end</span><span 
class="cmr-7">()</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48137r136"></a><span 
class="cmr-7">136</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">ffTime</span><span 
class="cmr-7">(</span><span 
class="cmr-7">STOP</span><span 
class="cmr-7">_TIME</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48138r137"></a><span 
class="cmr-7">137</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">printf</span><span 
class="cmr-7">(</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">Done</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">in</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">%11.6</span><span 
class="cmr-7">f</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">secs</span><span 
class="cmr-7">.</span><span 
class="cmsy-7">\</span><span 
class="cmr-7">n</span><span 
class="cmr-7">&#8221;</span><span 
class="cmr-7">,</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">(</span><span 
class="cmr-7">ffTime</span><span 
class="cmr-7">(</span><span 
class="cmr-7">GET</span><span 
class="cmr-7">_TIME</span><span 
class="cmr-7">)</span><span 
class="cmr-7">/1000.0)</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48139r138"></a><span 
class="cmr-7">138</span></span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48140r139"></a><span 
class="cmr-7">139</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">free</span><span 
class="cmr-7">((</span><span 
class="cmbx-7">void</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">A</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">free</span><span 
class="cmr-7">((</span><span 
class="cmbx-7">void</span><span 
class="cmsy-7">*</span><span 
class="cmr-7">)</span><span 
class="cmr-7">B</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">free</span><span 
class="cmr-7">(</span><span 
class="cmr-7">C</span><span 
class="cmr-7">)</span><span 
class="cmr-7">;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48141r140"></a><span 
class="cmr-7">140</span></span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmbx-7">return</span><span 
class="cmr-7">&#x00A0;</span><span 
class="cmr-7">0;</span><span 
class="cmr-7">&#x00A0;</span><br /><span class="tlabel"><a 
 id="x1-48142r141"></a><span 
class="cmr-7">141</span></span><span 
class="cmsy-7">}</span>
   </div>
   <h4 class="subsectionHead"><span class="titlemark">5.2.2   </span> <a 
 id="x1-490005.2.2"></a>Block-based Cholesky factorisation</h4>
<!--l. 330--><p class="noindent" ><span 
class="cmbx-10">To be added</span>
                                                                  

                                                                  
   <h2 class="likechapterHead"><a 
 id="x1-500005.2.2"></a>Bibliography</h2>
    <div class="thebibliography">
    <p class="bibitem" ><span class="biblabel">
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 id="Xstochkit-ff:hibb:10"></a>Marco  Aldinucci,  Andrea  Bracciali,  Pietro  Liò,  Anil  Sorathiya,  and
    Massimo Torquati.  StochKit-FF: Efficient systems biology on multicore
    architectures. In M.&#x00A0;R. Guarracino, F.&#x00A0;Vivien, J.&#x00A0;L. Träff, M.&#x00A0;Cannataro,
    M.&#x00A0;Danelutto,  A.&#x00A0;Hast,  F.&#x00A0;Perla,  A.&#x00A0;Knüpfer,  B.&#x00A0;Di  Martino,  and
    M.&#x00A0;Alexander,  editors,  <span 
class="cmti-10">Euro-Par  2010  Workshops,  Proc.  of  the  1st</span>
    <span 
class="cmti-10">Workshop on High Performance Bioinformatics and Biomedicine (HiBB)</span>,
    volume 6586 of <span 
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    </p>
    <p class="bibitem" ><span class="biblabel">
  [2]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a 
 id="Xdataflow:pdp:12"></a>Marco   Aldinucci,   Marco   Danelutto,   Lorenzo   Anardu,   Massimo
    Torquati,  and  Peter  Kilpatrick.   Parallel  patterns  +  macro  data  flow
    for  multi-core  programming.    In  <span 
class="cmti-10">Proc.  of  Intl.  Euromicro  PDP  2012:</span>
    <span 
class="cmti-10">Parallel Distributed and network-based Processing</span>, pages 27&#8211;36, Garching,
    Germany, feb 2012. IEEE.
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    <p class="bibitem" ><span class="biblabel">
  [3]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a 
 id="Xfastflow_acc:tr-10-03"></a>Marco  Aldinucci,  Marco  Danelutto,  Peter  Kilpatrick,  Massimiliano
    Meneghin, and Massimo Torquati. Accelerating sequential programs using
    FastFlow and self-offloading.   Technical Report TR-10-03, Università di
    Pisa, Dipartimento di Informatica, Italy, feb 2010.
    </p>
    <p class="bibitem" ><span class="biblabel">
  [4]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a 
 id="Xff:acc:europar:11"></a>Marco  Aldinucci,  Marco  Danelutto,  Peter  Kilpatrick,  Massimiliano
    Meneghin, and Massimo Torquati.  Accelerating code on multi-cores with
    fastflow.   In  E.&#x00A0;Jeannot,  R.&#x00A0;Namyst,  and  J.&#x00A0;Roman,  editors,  <span 
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    <span 
class="cmti-10">17th Intl. Euro-Par 2011 Parallel Processing</span>, volume 6853 of <span 
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    170&#8211;181, Bordeaux, France, August 2011. Springer.
    </p>
    <p class="bibitem" ><span class="biblabel">
  [5]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a 
 id="Xff:wileybook:11"></a>Marco  Aldinucci,  Marco  Danelutto,  Peter  Kilpatrick,  and  Massimo
                                                                  

                                                                  
    Torquati. Fastflow: high-level and efficient streaming on multi-core. In Sabri
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    <span 
class="cmti-10">Computing  Systems</span>,  Parallel  and  Distributed  Computing,  chapter&#x00A0;13.
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    <p class="bibitem" ><span class="biblabel">
  [6]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a 
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    Kilpatrick,  and  Massimo  Torquati.   Efficient  streaming  applications  on
    multi-core with FastFlow: the biosequence alignment test-bed. In Barbara
    Chapman, Frédéric Desprez, Gerhard&#x00A0;R. Joubert, Alain Lichnewsky, Frans
    Peters, and Thierry Priol, editors, <span 
class="cmti-10">Parallel Computing: From Multicores</span>
    <span 
class="cmti-10">and GPU&#8217;s to Petascale (Proc. of PARCO 2009, Lyon, France)</span>, volume&#x00A0;19
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    </p>
    <p class="bibitem" ><span class="biblabel">
  [7]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a 
 id="Xfastflow:pdp:10"></a>Marco  Aldinucci,  Massimiliano  Meneghin,  and  Massimo  Torquati.
    Efficient Smith-Waterman on multi-core with fastflow. In Marco Danelutto,
    Tom Gross, and Julien Bourgeois, editors, <span 
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    <span 
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    <p class="bibitem" ><span class="biblabel">
  [8]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a 
 id="Xyadtff:ccpe:13"></a>Marco Aldinucci, Salvatore Ruggieri, and Massimo Torquati. Decision
    tree building on multi-core using fastflow. <span 
class="cmti-10">Concurrency and Computation:</span>
    <span 
class="cmti-10">Practice and Experience</span>, 26(3):800&#8211;820, March 2014.
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    <p class="bibitem" ><span class="biblabel">
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class="cmti-10">FastFlow  website</span>,  2009.
    <a 
href="http://mc-fastflow.sourceforge.net/" class="url" ><span 
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    <p class="bibitem" ><span class="biblabel">
 [10]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a 
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    <p class="bibitem" ><span class="biblabel">
 [11]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a 
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    Drocco, Claudia Misale, Cristina Calcagno, and Mario Coppo.   Parallel
                                                                  

                                                                  
    stochastic systems biology in the cloud. <span 
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    2013.
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    <p class="bibitem" ><span class="biblabel">
 [12]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a 
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class="cmti-10">Algorithmic  Skeletons:  Structured  Management  of</span>
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class="cmti-10">Parallel  Computations</span>.     Research  Monographs  in  Par.  and  Distrib.
    Computing. Pitman, 1989.
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 id="Xcole:manifesto:02"></a>Murray  Cole.    Bringing  skeletons  out  of  the  closet:  A  pragmatic
    manifesto   for   skeletal   parallel   programming.      <span 
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    30(3):389&#8211;406, 2004.
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    <p class="bibitem" ><span class="biblabel">
 [14]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a 
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    <p class="bibitem" ><span class="biblabel">
 [15]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a 
 id="Xff:DPI:13"></a>Marco Danelutto, Luca Deri, Daniele&#x00A0;De Sensi, and Massimo Torquati.
    Deep packet inspection on commodity hardware using fastflow. In <span 
class="cmti-10">Proc. of</span>
    <span 
class="cmti-10">PARCO 2013 Conference, Munich, Germany</span>, Munich, Germany, 2013.
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 [16]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a 
 id="X13:ff:tutorial:CEFP"></a>Marco   Danelutto   and   Massimo   Torquati.      Structured   parallel
    programming with &#8221;core&#8221; fastflow.  In <span 
class="cmti-10">Formal Methods for Components</span>
    <span 
class="cmti-10">and Objects: 7th Intl. Symposium, FMCO 2008, Sophia-Antipolis, France,</span>
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    Springer, 2014.
    </p>
    <p class="bibitem" ><span class="biblabel">
 [17]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a 
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    skeleton frameworks: high-level structured parallel programming enablers.
    <span 
class="cmti-10">Softw., Pract. Exper.</span>, 40(12):1135&#8211;1160, 2010.
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    <p class="bibitem" ><span class="biblabel">
 [18]<span class="bibsp">&#x00A0;&#x00A0;&#x00A0;</span></span><a 
 id="Xbowtie-bwa:ff:multicore:biomed:14"></a>Claudia   Misale,   Giulio   Ferrero,   Massimo   Torquati,   and   Marco
    Aldinucci. Sequence alignment tools: one parallel pattern to rule them all?
    <span 
class="cmti-10">BioMed Research International</span>, 2014.
</p>
                                                                  

                                                                  
    </div>
    
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