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
34 namespace blink {
35
TaskSynchronizer()36 TaskSynchronizer::TaskSynchronizer()
37 : m_taskCompleted(false)
38 {
39 }
40
waitForTaskCompletion()41 void 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
waitForTaskCompletionInternal()54 void TaskSynchronizer::waitForTaskCompletionInternal()
55 {
56 m_synchronousMutex.lock();
57 while (!m_taskCompleted)
58 m_synchronousCondition.wait(m_synchronousMutex);
59 m_synchronousMutex.unlock();
60 }
61
taskCompleted()62 void 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