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      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:
     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:
     49         virtual ~Task() { }
     50         virtual void performTask() = 0;
     51         void* instance() const { return m_instance; }
     52     protected:
     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 
     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