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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>A Simple OpenMP Example and Test</title>
<meta http-equiv='Content-Type' content='text/html' charset='utf-8'/>
<meta name="description" id="description" content="A Simple OpenMP Example and Test"/>
<meta name="keywords" id="keywords" content=" Openmp example A.1.1c thread a simple openmp and test purpose source code "/>
<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='_a11c_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="thread_test.cpp.xml" target="_top">Prev</a>
</td><td><a href="a11c_bthread.cpp.xml" target="_top">Next</a>
</td><td>
<select onchange='choose_across0(this)'>
<option>Index-&gt;</option>
<option>contents</option>
<option>reference</option>
<option>index</option>
<option>search</option>
<option>external</option>
</select>
</td>
<td>
<select onchange='choose_up0(this)'>
<option>Up-&gt;</option>
<option>CppAD</option>
<option>multi_thread</option>
<option>thread_test.cpp</option>
<option>a11c_openmp.cpp</option>
</select>
</td>
<td>
<select onchange='choose_down3(this)'>
<option>CppAD-&gt;</option>
<option>Install</option>
<option>Introduction</option>
<option>AD</option>
<option>ADFun</option>
<option>preprocessor</option>
<option>multi_thread</option>
<option>library</option>
<option>ipopt_solve</option>
<option>Example</option>
<option>speed</option>
<option>Appendix</option>
</select>
</td>
<td>
<select onchange='choose_down2(this)'>
<option>multi_thread-&gt;</option>
<option>parallel_ad</option>
<option>thread_test.cpp</option>
</select>
</td>
<td>
<select onchange='choose_down1(this)'>
<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>
<option>team_example.cpp</option>
<option>harmonic.cpp</option>
<option>multi_newton.cpp</option>
<option>team_thread.hpp</option>
</select>
</td>
<td>a11c_openmp.cpp</td>
<td>
<select onchange='choose_current0(this)'>
<option>Headings-&gt;</option>
<option>Purpose</option>
<option>Source Code</option>
</select>
</td>
</tr></table><br/>







<center><b><big><big>A Simple OpenMP Example and Test</big></big></b></center>
<br/>
<b><big><a name="Purpose" id="Purpose">Purpose</a></big></b>
<br/>
This example just demonstrates OpenMP and does not use CppAD at all.

<br/>
<br/>
<b><big><a name="Source Code" id="Source Code">Source Code</a></big></b>

<code><font color="blue">
<br/>
<pre style='display:inline'> 
# include &lt;omp.h&gt;
# include &lt;limits&gt;
# include &lt;cmath&gt;
# include &lt;cassert&gt;
# define NUMBER_THREADS 4

namespace {
	// Beginning of Example A.1.1.1c of OpenMP 2.5 standard document ---------
	void a1(int n, float *a, float *b)
	{	int i;
	# pragma omp parallel for
		for(i = 1; i &lt; n; i++) /* i is private by default */
		{	assert( omp_get_num_threads() == NUMBER_THREADS );
			b[i] = (a[i] + a[i-1]) / 2.0;
		}
	}
	// End of Example A.1.1.1c of OpenMP 2.5 standard document ---------------
}
bool a11c(void)
{	bool ok = true;

	// Test setup
	int i, n = 1000;
	float *a = new float[n];
	float *b = new float[n];
	for(i = 0; i &lt; n; i++)
		a[i] = float(i);

	int n_thread = NUMBER_THREADS;   // number of threads in parallel regions
	omp_set_dynamic(0);              // off dynamic thread adjust
	omp_set_num_threads(n_thread);   // set the number of threads 

	a1(n, a, b);

	// check the result
	float eps = 100. * std::numeric_limits&lt;float&gt;::epsilon();
	for(i = 1; i &lt; n ; i++)
		ok &amp;= std::fabs( (2. * b[i] - a[i] - a[i-1]) / b[i] ) &lt;= eps; 

	delete [] a;
	delete [] b;

	return ok;
}
</pre>

</font></code>

<hr/>Input File: multi_thread/openmp/a11c_openmp.cpp

</body>
</html>