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79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | www.openfoam.com
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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Copyright (C) 2017-2022 OpenCFD Ltd.
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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Description
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Simple test program for compiling/running openmp
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\*---------------------------------------------------------------------------*/
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#include <cstdio>
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#include <cstdlib>
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#include <iostream>
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#if _OPENMP
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#include <omp.h>
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#endif
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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// Main program:
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int main(int argc, char *argv[])
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{
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std::cout
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<< "c++ = " << __cplusplus << '\n';
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#if _OPENMP
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std::cout
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<< "openmp = " << _OPENMP << '\n'
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<< "Initial threads = " << omp_get_num_threads() << "\n\n";
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// Fork threads with their own copies of variables
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int nThreads, threadId;
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#pragma omp parallel private(nThreads, threadId)
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{
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threadId = omp_get_thread_num();
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nThreads = omp_get_num_threads();
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// Master thread
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if (threadId == 0)
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{
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// Printf rather than cout to ensure that it emits in one go
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printf("Number of threads = %d\n", nThreads);
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}
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// Printf rather than cout to ensure that it emits in one go
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printf("Called from thread = %d\n", threadId);
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}
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#else
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std::cout << "Compiled without openmp!\n";
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#endif
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return 0;
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}
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// ************************************************************************* //
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