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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 #include "config.h"
     26 
     27 #include "CCThread.h"
     28 
     29 #include "LayerRendererChromium.h"
     30 #include <wtf/CurrentTime.h>
     31 #include <wtf/PassOwnPtr.h>
     32 #include <wtf/ThreadingPrimitives.h>
     33 
     34 namespace WebCore {
     35 
     36 using namespace WTF;
     37 
     38 CCThread::CCThread()
     39 {
     40     MutexLocker lock(m_threadCreationMutex);
     41     m_threadID = createThread(CCThread::compositorThreadStart, this, "Chromium Compositor");
     42 }
     43 
     44 CCThread::~CCThread()
     45 {
     46     m_queue.kill();
     47 
     48     // Stop thread.
     49     void* exitCode;
     50     waitForThreadCompletion(m_threadID, &exitCode);
     51     m_threadID = 0;
     52 }
     53 
     54 void CCThread::postTask(PassOwnPtr<Task> task)
     55 {
     56     m_queue.append(task);
     57 }
     58 
     59 void* CCThread::compositorThreadStart(void* userdata)
     60 {
     61     CCThread* ccThread = static_cast<CCThread*>(userdata);
     62     return ccThread->runLoop();
     63 }
     64 
     65 void* CCThread::runLoop()
     66 {
     67     {
     68         // Wait for CCThread::start() to complete to have m_threadID
     69         // established before starting the main loop.
     70         MutexLocker lock(m_threadCreationMutex);
     71     }
     72 
     73     while (OwnPtr<Task> task = m_queue.waitForMessage())
     74         task->performTask();
     75 
     76     return 0;
     77 }
     78 
     79 }
     80