Source/WTF/wtf/Lock.cpp

/*
 * Copyright (C) 2015-2017 Apple Inc. 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 APPLE INC. ``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 APPLE INC. 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. 
 */

#include "config.h"
#include "Lock.h"

#include <wtf/LockAlgorithmInlines.h>
#include <wtf/StackShotProfiler.h>

namespace WTF {

static constexpr bool profileLockContention = false;

void Lock::lockSlow()
{
    if (profileLockContention)
        STACK_SHOT_PROFILE(4, 2, 5);
    DefaultLockAlgorithm::lockSlow(m_byte);
}

void Lock::unlockSlow()
{
    DefaultLockAlgorithm::unlockSlow(m_byte, DefaultLockAlgorithm::Unfair);
}

void Lock::unlockFairlySlow()
{
    DefaultLockAlgorithm::unlockSlow(m_byte, DefaultLockAlgorithm::Fair);
}

void Lock::safepointSlow()
{
    DefaultLockAlgorithm::safepointSlow(m_byte);
}

} // namespace WTF