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<?xml version='1.0'?>
<html xmlns='http://www.w3.org/1999/xhtml'
      xmlns:math='http://www.w3.org/1998/Math/MathML'
>
<head>
<title>OpenMP Implementation of a Team of AD Threads</title>
<meta http-equiv='Content-Type' content='text/html' charset='utf-8'/>
<meta name="description" id="description" content="OpenMP Implementation of a Team of AD Threads"/>
<meta name="keywords" id="keywords" content=" openmp Ad team implementation of a ad threads "/>
<style type='text/css'>
body { color : black }
body { background-color : white }
A:link { color : blue }
A:visited { color : purple }
A:active { color : purple }
</style>
<script type='text/javascript' language='JavaScript' src='_team_openmp.cpp_xml.js'>
</script>
</head>
<body>
<table><tr>
<td>
<a href="http://www.coin-or.org/CppAD/" target="_top"><img border="0" src="_image.gif"/></a>
</td>
<td><a href="team_thread.hpp.xml" target="_top">Prev</a>
</td><td><a href="team_bthread.cpp.xml" target="_top">Next</a>
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<option>team_openmp.cpp</option>
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<option>multi_thread-&gt;</option>
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<option>thread_test.cpp-&gt;</option>
<option>a11c_openmp.cpp</option>
<option>a11c_bthread.cpp</option>
<option>a11c_pthread.cpp</option>
<option>simple_ad_openmp.cpp</option>
<option>simple_ad_bthread.cpp</option>
<option>simple_ad_pthread.cpp</option>
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</td>
<td>team_openmp.cpp</td>
<td>Headings</td>
</tr></table><br/>







<center><b><big><big>OpenMP Implementation of a Team of AD Threads</big></big></b></center>
See <a href="team_thread.hpp.xml" target="_top"><span style='white-space: nowrap'>team_thread.hpp</span></a>
 for this routines specifications.

<code><font color="blue">
<pre style='display:inline'> 
# include &lt;omp.h&gt;
# include &lt;cppad/cppad.hpp&gt;
# include &quot;../team_thread.hpp&quot;

namespace {
	using CppAD::thread_alloc;

	// number of threads in this team
	size_t num_threads_;

	// used to inform CppAD when we are in parallel execution mode
	bool in_parallel(void)
	{	return static_cast&lt;bool&gt; ( omp_in_parallel() ); }

	// used to inform CppAD of the current thread number
	size_t thread_num(void)
	{	return static_cast&lt;size_t&gt;( omp_get_thread_num() ); } 
}

bool team_create(size_t num_threads)
{
	bool ok = ! in_parallel();
	ok     &amp;= thread_num() == 0;;
	ok     &amp;= num_threads &gt; 0;

	// Turn off dynamic thread adjustment
	omp_set_dynamic(0);

	// Set the number of OpenMP threads
	omp_set_num_threads( int(num_threads) );

	// setup for using CppAD::<a href="ad.xml" target="_top">AD</a>&lt;double&gt; in parallel 
	thread_alloc::parallel_setup(num_threads, in_parallel, thread_num);
	thread_alloc::hold_memory(true);
	CppAD::parallel_ad&lt;double&gt;();

	// inform team_work of number of threads
	num_threads_ = num_threads;

	return ok;
}

bool team_work(void worker(void))
{	bool ok = ! in_parallel();
	ok     &amp;= thread_num() == 0;;
	ok     &amp;= num_threads_ &gt; 0;

	int number_threads = int(num_threads_);
	int thread_num;
# pragma omp parallel for
	for(thread_num = 0; thread_num &lt; number_threads; thread_num++)
		worker();
// end omp parallel for	

	return ok;
}

bool team_destroy(void)
{	bool ok = ! in_parallel();
	ok     &amp;= thread_num() == 0;;
	ok     &amp;= num_threads_ &gt; 0;

	// inform team_work of number of threads
	num_threads_ = 1;

	// Set the number of OpenMP threads to one
	omp_set_num_threads(num_threads_);

	// inform CppAD no longer in multi-threading mode
	thread_alloc::parallel_setup(num_threads_, CPPAD_NULL, CPPAD_NULL);
	thread_alloc::hold_memory(false);
	CppAD::parallel_ad&lt;double&gt;();

	return ok;
}

const char* team_name(void)
{	return &quot;openmp&quot;; }
</pre>

</font></code>


<hr/>Input File: multi_thread/openmp/team_openmp.cpp

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</html>