1/*
2 * Copyright (C) 2015-2017 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include <wtf/Lock.h>
28
29#include <wtf/LockAlgorithmInlines.h>
30#include <wtf/StackShotProfiler.h>
31
32namespace WTF {
33
34static constexpr bool profileLockContention = false;
35
36void Lock::lockSlow()
37{
38 if (profileLockContention)
39 STACK_SHOT_PROFILE(4, 2, 5);
40 DefaultLockAlgorithm::lockSlow(m_byte);
41}
42
43void Lock::unlockSlow()
44{
45 DefaultLockAlgorithm::unlockSlow(m_byte, DefaultLockAlgorithm::Unfair);
46}
47
48void Lock::unlockFairlySlow()
49{
50 DefaultLockAlgorithm::unlockSlow(m_byte, DefaultLockAlgorithm::Fair);
51}
52
53void Lock::safepointSlow()
54{
55 DefaultLockAlgorithm::safepointSlow(m_byte);
56}
57
58} // namespace WTF
59
60