1/*
2 * Copyright (C) 2011 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. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "BinarySemaphore.h"
28
29namespace WTF {
30
31BinarySemaphore::BinarySemaphore()
32    : m_event(::CreateEventW(0, FALSE, FALSE, 0))
33{
34}
35
36BinarySemaphore::~BinarySemaphore()
37{
38    ::CloseHandle(m_event);
39}
40
41void BinarySemaphore::signal()
42{
43    ::SetEvent(m_event);
44}
45
46bool BinarySemaphore::wait(double absoluteTime)
47{
48    DWORD interval = absoluteTimeToWaitTimeoutInterval(absoluteTime);
49    if (!interval) {
50        // Consider the wait to have timed out, even if the event has already been signaled, to
51        // match the WTF::ThreadCondition implementation.
52        return false;
53    }
54
55    DWORD result = ::WaitForSingleObject(m_event, interval);
56    switch (result) {
57    case WAIT_OBJECT_0:
58        // The event was signaled.
59        return true;
60
61    case WAIT_TIMEOUT:
62        // The wait timed out.
63        return false;
64
65    case WAIT_FAILED:
66        ASSERT_WITH_MESSAGE(false, "::WaitForSingleObject failed with error %lu", ::GetLastError());
67        return false;
68
69    default:
70        ASSERT_WITH_MESSAGE(false, "::WaitForSingleObject returned unexpected result %lu", result);
71        return false;
72    }
73}
74
75} // namespace WTF
76