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#ifndef ScrollingThread_h 27#define ScrollingThread_h 28 29#if ENABLE(ASYNC_SCROLLING) 30 31#include <condition_variable> 32#include <functional> 33#include <wtf/Forward.h> 34#include <wtf/Noncopyable.h> 35#include <wtf/Threading.h> 36#include <wtf/Vector.h> 37 38#if PLATFORM(COCOA) 39#include <wtf/RetainPtr.h> 40#endif 41 42namespace WebCore { 43 44class ScrollingThread { 45 WTF_MAKE_NONCOPYABLE(ScrollingThread); 46 47public: 48 static bool isCurrentThread(); 49 static void dispatch(std::function<void ()>); 50 51 // Will dispatch the given function on the main thread once all pending functions 52 // on the scrolling thread have finished executing. Used for synchronization purposes. 53 static void dispatchBarrier(std::function<void ()>); 54 55private: 56 friend NeverDestroyed<ScrollingThread>; 57 58 ScrollingThread(); 59 60 static ScrollingThread& shared(); 61 62 void createThreadIfNeeded(); 63 static void threadCallback(void* scrollingThread); 64 void threadBody(); 65 void dispatchFunctionsFromScrollingThread(); 66 67 void initializeRunLoop(); 68 void wakeUpRunLoop(); 69 70#if PLATFORM(COCOA) 71 static void threadRunLoopSourceCallback(void* scrollingThread); 72 void threadRunLoopSourceCallback(); 73#endif 74 75 ThreadIdentifier m_threadIdentifier; 76 77 std::condition_variable m_initializeRunLoopConditionVariable; 78 std::mutex m_initializeRunLoopMutex; 79 80 std::mutex m_functionsMutex; 81 Vector<std::function<void ()>> m_functions; 82 83#if PLATFORM(COCOA) 84 // FIXME: We should use WebCore::RunLoop here. 85 RetainPtr<CFRunLoopRef> m_threadRunLoop; 86 RetainPtr<CFRunLoopSourceRef> m_threadRunLoopSource; 87#endif 88}; 89 90} // namespace WebCore 91 92#endif // ENABLE(ASYNC_SCROLLING) 93 94#endif // ScrollingThread_h 95