openmp/testsuite/c/omp_parallel_num_threads.c

<ompts:test>
<ompts:testdescription>Test which checks the omp_parallel_num_threads directive by counting the threads in a parallel region which was started with an explicitly stated number of threads.</ompts:testdescription>
<ompts:ompversion>3.0</ompts:ompversion>
<ompts:directive>omp parellel num_threads</ompts:directive>
<ompts:dependences>omp master,omp parallel reduction,omp atomic</ompts:dependences>
<ompts:testcode>
#include <stdio.h>
#include "omp_testsuite.h"

int <ompts:testcode:functionname>omp_parallel_num_threads</ompts:testcode:functionname>(FILE * logFile){
    <ompts:orphan:vars>
	int failed;
	int threads;
	int nthreads;
    </ompts:orphan:vars>

    int max_threads = 0;

    failed = 0;

    /* first we check how many threads are available */
#pragma omp parallel
    {
#pragma omp master
	max_threads = omp_get_num_threads ();
    }

    /* we increase the number of threads from one to maximum:*/
    for (threads = 1; threads <= max_threads; threads++)
    {
	nthreads = 0;

	<ompts:orphan>
#pragma omp parallel reduction(+:failed) <ompts:check>num_threads(threads)</ompts:check>
	    {
		failed = failed + !(threads == omp_get_num_threads ());
#pragma omp atomic
	    nthreads += 1;
	    }
	</ompts:orphan>
	failed = failed + !(nthreads == threads);
    }
    return (!failed);
}
</ompts:testcode>
</ompts:test>