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/*
* Copyright (C) 2011 University of Szeged
* Copyright (C) 2011 Gabor Loki <loki@webkit.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL UNIVERSITY OF SZEGED OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef ParallelJobsOpenMP_h
#define ParallelJobsOpenMP_h
#if ENABLE(THREADING_OPENMP)
#include <omp.h>
namespace WTF {
class ParallelEnvironment {
WTF_MAKE_NONCOPYABLE(ParallelEnvironment);
WTF_MAKE_FAST_ALLOCATED;
public:
typedef void (*ThreadFunction)(void*);
ParallelEnvironment(ThreadFunction threadFunction, size_t sizeOfParameter, int requestedJobNumber) :
m_threadFunction(threadFunction),
m_sizeOfParameter(sizeOfParameter)
{
int maxNumberOfThreads = omp_get_max_threads();
if (!requestedJobNumber || requestedJobNumber > maxNumberOfThreads)
requestedJobNumber = maxNumberOfThreads;
ASSERT(requestedJobNumber > 0);
m_numberOfJobs = requestedJobNumber;
}
int numberOfJobs()
{
return m_numberOfJobs;
}
void execute(unsigned char* parameters)
{
omp_set_num_threads(m_numberOfJobs);
#pragma omp parallel for
for (int i = 0; i < m_numberOfJobs; ++i)
(*m_threadFunction)(parameters + i * m_sizeOfParameter);
}
private:
ThreadFunction m_threadFunction;
size_t m_sizeOfParameter;
int m_numberOfJobs;
};
} // namespace WTF
#endif // ENABLE(THREADING_OPENMP)
#endif // ParallelJobsOpenMP_h