1/*
2 * Copyright (C) 2007, 2008, 2013 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 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include "config.h"
30#include "platform/TaskSynchronizer.h"
31
32#include "heap/ThreadState.h"
33
34namespace blink {
35
36TaskSynchronizer::TaskSynchronizer()
37    : m_taskCompleted(false)
38{
39}
40
41void TaskSynchronizer::waitForTaskCompletion()
42{
43    if (ThreadState::current()) {
44        // Prevent the deadlock between park request by other threads and blocking
45        // by m_synchronousCondition.
46        ThreadState::SafePointScope scope(ThreadState::HeapPointersOnStack);
47        waitForTaskCompletionInternal();
48    } else {
49        // If this thread is already detached, we no longer need to enter a safe point scope.
50        waitForTaskCompletionInternal();
51    }
52}
53
54void TaskSynchronizer::waitForTaskCompletionInternal()
55{
56    m_synchronousMutex.lock();
57    while (!m_taskCompleted)
58        m_synchronousCondition.wait(m_synchronousMutex);
59    m_synchronousMutex.unlock();
60}
61
62void TaskSynchronizer::taskCompleted()
63{
64    m_synchronousMutex.lock();
65    m_taskCompleted = true;
66    m_synchronousCondition.signal();
67    m_synchronousMutex.unlock();
68}
69
70} // namespace blink
71