mirror of
https://github.com/darlinghq/darling-WTF.git
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69 lines
2.1 KiB
C++
69 lines
2.1 KiB
C++
/*
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* Copyright (C) 2017 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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#include "config.h"
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#include <wtf/ReadWriteLock.h>
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#include <wtf/Locker.h>
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namespace WTF {
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void ReadWriteLock::readLock()
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{
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auto locker = holdLock(m_lock);
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while (m_isWriteLocked || m_numWaitingWriters)
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m_cond.wait(m_lock);
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m_numReaders++;
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}
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void ReadWriteLock::readUnlock()
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{
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auto locker = holdLock(m_lock);
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m_numReaders--;
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if (!m_numReaders)
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m_cond.notifyAll();
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}
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void ReadWriteLock::writeLock()
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{
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auto locker = holdLock(m_lock);
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while (m_isWriteLocked || m_numReaders) {
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m_numWaitingWriters++;
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m_cond.wait(m_lock);
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m_numWaitingWriters--;
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}
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m_isWriteLocked = true;
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}
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void ReadWriteLock::writeUnlock()
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{
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auto locker = holdLock(m_lock);
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m_isWriteLocked = false;
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m_cond.notifyAll();
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}
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} // namespace WTF
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