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/*
* Copyright (C) 2007, 2008, 2013 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.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 "platform/TaskSynchronizer.h"
#include "platform/heap/SafePoint.h"
#include "platform/heap/ThreadState.h"
namespace blink {
TaskSynchronizer::TaskSynchronizer()
: m_taskCompleted(false)
{
}
void TaskSynchronizer::waitForTaskCompletion()
{
if (ThreadState::current()) {
// Prevent the deadlock between park request by other threads and blocking
// by m_synchronousCondition.
SafePointScope scope(BlinkGC::HeapPointersOnStack);
waitForTaskCompletionInternal();
} else {
// If this thread is already detached, we no longer need to enter a safe point scope.
waitForTaskCompletionInternal();
}
}
void TaskSynchronizer::waitForTaskCompletionInternal()
{
m_synchronousMutex.lock();
while (!m_taskCompleted)
m_synchronousCondition.wait(m_synchronousMutex);
m_synchronousMutex.unlock();
}
void TaskSynchronizer::taskCompleted()
{
m_synchronousMutex.lock();
m_taskCompleted = true;
m_synchronousCondition.signal();
m_synchronousMutex.unlock();
}
} // namespace blink
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