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64 lines
2.4 KiB
C++
64 lines
2.4 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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ParallelFor::ParallelFor (ThreadGroup& pool)
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: m_pool (pool)
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, m_finishedEvent (false) // auto-reset
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{
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}
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int ParallelFor::getNumberOfThreads () const
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{
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return m_pool.getNumberOfThreads ();
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}
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void ParallelFor::doLoop (int numberOfIterations, Iteration& iteration)
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{
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if (numberOfIterations > 1)
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{
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int const numberOfThreads = m_pool.getNumberOfThreads ();
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// The largest number of pool threads we need is one less than the number
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// of iterations, because we also run the loop body on the caller's thread.
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//
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int const maxThreads = numberOfIterations - 1;
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// Calculate the number of parallel instances as the smaller of the number
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// of threads available (including the caller's) and the number of iterations.
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//
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int const numberOfParallelInstances = std::min (
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numberOfThreads + 1, numberOfIterations);
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LoopState* loopState (new (m_pool.getAllocator ()) LoopState (
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iteration, m_finishedEvent, numberOfIterations, numberOfParallelInstances));
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m_pool.call (maxThreads, &LoopState::forLoopBody, loopState);
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// Also use the caller's thread to run the loop body.
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loopState->forLoopBody ();
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m_finishedEvent.wait ();
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}
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else if (numberOfIterations == 1)
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{
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// Just one iteration, so do it.
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iteration (0);
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}
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}
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