| /* |
| * 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 "config.h" |
| #include "platform/TaskSynchronizer.h" |
| |
| #include "heap/ThreadState.h" |
| |
| namespace WebCore { |
| |
| TaskSynchronizer::TaskSynchronizer() |
| : m_taskCompleted(false) |
| #ifndef NDEBUG |
| , m_hasCheckedForTermination(false) |
| #endif |
| { |
| } |
| |
| void TaskSynchronizer::waitForTaskCompletion() |
| { |
| if (ThreadState::current()) { |
| // Prevent the deadlock between park request by other threads and blocking |
| // by m_synchronousCondition. |
| ThreadState::SafePointScope scope(ThreadState::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 WebCore |