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	1	/*
	2	* Copyright (C) 2011 University of Szeged
	3	* Copyright (C) 2011 Gabor Loki <loki@webkit.org>
	4	* All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	*
	15	* THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY
	16	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	17	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	18	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL UNIVERSITY OF SZEGED OR
	19	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	20	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	21	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	22	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
	23	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	24	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	25	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	26	*/
	27
	28	#ifndef ParallelJobsLibdispatch_h
	29	#define ParallelJobsLibdispatch_h
	30
	31	#if ENABLE(THREADING_LIBDISPATCH)
	32
	33	#include <dispatch/dispatch.h>
	34
	35	namespace WTF {
	36
	37	static const int maxParallelThreads = 2;
	38
	39	class ParallelEnvironment {
	40	WTF_MAKE_FAST_ALLOCATED;
	41	public:
	42	typedef void (ThreadFunction)(void);
	43
	44	ParallelEnvironment(ThreadFunction threadFunction, size_t sizeOfParameter, int requestedJobNumber) :
	45	m_threadFunction(threadFunction),
	46	m_sizeOfParameter(sizeOfParameter)
	47	{
	48	if (!requestedJobNumber \|\| requestedJobNumber > maxParallelThreads)
	49	requestedJobNumber = maxParallelThreads;
	50
	51	ASSERT(requestedJobNumber > 0);
	52
	53	m_numberOfJobs = requestedJobNumber;
	54	}
	55
	56	int numberOfJobs()
	57	{
	58	return m_numberOfJobs;
	59	}
	60
	61	void execute(unsigned char* parameters)
	62	{
	63	// libdispatch is NOT supported inside a template
	64	dispatch_queue_t parallelJobsQueue = dispatch_queue_create("ParallelJobs", 0);
	65
	66	for (int i = 0; i < m_numberOfJobs - 1; ++i) {
	67	dispatch_async(parallelJobsQueue, ^{(*m_threadFunction)(parameters);});
	68	parameters += m_sizeOfParameter;
	69	}
	70
	71	// The work for the main thread. Wait until all jobs are done.
	72	dispatch_sync(parallelJobsQueue, ^{(*m_threadFunction)(parameters);});
	73	}
	74
	75	private:
	76	ThreadFunction m_threadFunction;
	77	size_t m_sizeOfParameter;
	78	int m_numberOfJobs;
	79	};
	80
	81	} // namespace WTF
	82
	83	#endif // ENABLE(THREADING_LIBDISPATCH)
	84
	85	#endif // ParallelJobsLibdispatch_h