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