1 /* 2 * Copyright (C) 2011 Google 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'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY 17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 25 #ifndef CCThread_h 26 #define CCThread_h 27 28 #include <wtf/MessageQueue.h> 29 #include <wtf/PassOwnPtr.h> 30 #include <wtf/RefCounted.h> 31 #include <wtf/Threading.h> 32 33 namespace WebCore { 34 35 // The CCThread singleton owns the compositor thread and provides 36 // basic infrastructure for messaging between the two threads. 37 class CCThread { 38 public: create()39 static PassOwnPtr<CCThread> create() 40 { 41 return adoptPtr(new CCThread()); 42 } 43 44 virtual ~CCThread(); 45 46 class Task { 47 WTF_MAKE_NONCOPYABLE(Task); 48 public: ~Task()49 virtual ~Task() { } 50 virtual void performTask() = 0; instance()51 void* instance() const { return m_instance; } 52 protected: Task(void * instance)53 Task(void* instance) : m_instance(instance) { } 54 void* m_instance; 55 }; 56 57 void postTask(PassOwnPtr<Task>); // Executes the task on context's thread asynchronously. 58 threadID()59 WTF::ThreadIdentifier threadID() const { return m_threadID; } 60 61 protected: 62 explicit CCThread(); 63 64 static void* compositorThreadStart(void*); 65 void* runLoop(); 66 67 WTF::ThreadIdentifier m_threadID; 68 MessageQueue<Task> m_queue; 69 70 Mutex m_threadCreationMutex; 71 }; 72 73 } 74 75 #endif 76