mirror of
https://github.com/darlinghq/darling-WTF.git
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79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
/*
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* Copyright (C) 2015 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <wtf/FastMalloc.h>
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#include <wtf/Lock.h>
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#include <wtf/Noncopyable.h>
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namespace WTF {
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template<typename VectorType>
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class ParallelVectorIterator {
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WTF_MAKE_NONCOPYABLE(ParallelVectorIterator);
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WTF_MAKE_FAST_ALLOCATED;
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public:
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ParallelVectorIterator(VectorType& vector, size_t shardSize)
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: m_vector(vector)
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, m_shardSize(shardSize)
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{
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}
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template<typename Functor>
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ALWAYS_INLINE void iterate(const Functor& functor)
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{
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for (;;) {
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size_t begin;
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size_t end;
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{
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LockHolder locker(m_lock);
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begin = m_next;
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if (begin == m_vector.size())
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return;
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if (m_vector.size() - begin < m_shardSize)
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end = m_vector.size();
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else
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end = begin + m_shardSize;
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RELEASE_ASSERT(end <= m_vector.size());
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RELEASE_ASSERT(begin < end);
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m_next = end;
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}
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for (size_t i = begin; i < end; ++i)
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functor(m_vector[i]);
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}
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}
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private:
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VectorType& m_vector;
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Lock m_lock;
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size_t m_shardSize;
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size_t m_next { 0 };
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};
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} // namespace WTF
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using WTF::ParallelVectorIterator;
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