1/* 2 * Copyright (C) 2012 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 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include "config.h" 27#include "ScrollingThread.h" 28 29#if ENABLE(THREADED_SCROLLING) 30 31#include <wtf/MainThread.h> 32 33namespace WebCore { 34 35ScrollingThread::ScrollingThread() 36 : m_threadIdentifier(0) 37{ 38} 39 40bool ScrollingThread::isCurrentThread() 41{ 42 if (!shared().m_threadIdentifier) 43 return false; 44 45 return currentThread() == shared().m_threadIdentifier; 46} 47 48void ScrollingThread::dispatch(const Function<void()>& function) 49{ 50 shared().createThreadIfNeeded(); 51 52 { 53 MutexLocker locker(shared().m_functionsMutex); 54 shared().m_functions.append(function); 55 } 56 57 shared().wakeUpRunLoop(); 58} 59 60static void callFunctionOnMainThread(const Function<void()>* function) 61{ 62 callOnMainThread(*function); 63 delete function; 64} 65 66void ScrollingThread::dispatchBarrier(const Function<void()>& function) 67{ 68 dispatch(bind(callFunctionOnMainThread, new Function<void()>(function))); 69} 70 71ScrollingThread& ScrollingThread::shared() 72{ 73 DEFINE_STATIC_LOCAL(ScrollingThread, scrollingThread, ()); 74 return scrollingThread; 75} 76 77void ScrollingThread::createThreadIfNeeded() 78{ 79 if (m_threadIdentifier) 80 return; 81 82 // Wait for the thread to initialize the run loop. 83 { 84 MutexLocker locker(m_initializeRunLoopConditionMutex); 85 86 m_threadIdentifier = createThread(threadCallback, this, "WebCore: Scrolling"); 87 88#if PLATFORM(MAC) 89 while (!m_threadRunLoop) 90 m_initializeRunLoopCondition.wait(m_initializeRunLoopConditionMutex); 91#endif 92 } 93} 94 95void ScrollingThread::threadCallback(void* scrollingThread) 96{ 97 static_cast<ScrollingThread*>(scrollingThread)->threadBody(); 98} 99 100void ScrollingThread::threadBody() 101{ 102 initializeRunLoop(); 103} 104 105void ScrollingThread::dispatchFunctionsFromScrollingThread() 106{ 107 ASSERT(isCurrentThread()); 108 109 Vector<Function<void()> > functions; 110 111 { 112 MutexLocker locker(m_functionsMutex); 113 m_functions.swap(functions); 114 } 115 116 for (size_t i = 0; i < functions.size(); ++i) 117 functions[i](); 118} 119 120} // namespace WebCore 121 122#endif // ENABLE(THREADED_SCROLLING) 123