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      1 /*
      2  * Copyright (C) 2010 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 "RunLoop.h"
     28 
     29 #include "WorkItem.h"
     30 #include <wtf/StdLibExtras.h>
     31 
     32 static RunLoop* s_mainRunLoop;
     33 
     34 void RunLoop::initializeMainRunLoop()
     35 {
     36     if (s_mainRunLoop)
     37         return;
     38     s_mainRunLoop = RunLoop::current();
     39 }
     40 
     41 RunLoop* RunLoop::current()
     42 {
     43     DEFINE_STATIC_LOCAL(WTF::ThreadSpecific<RunLoop>, runLoopData, ());
     44     return &*runLoopData;
     45 }
     46 
     47 RunLoop* RunLoop::main()
     48 {
     49     ASSERT(s_mainRunLoop);
     50     return s_mainRunLoop;
     51 }
     52 
     53 void RunLoop::performWork()
     54 {
     55     Vector<WorkItem*> workItemQueue;
     56     {
     57         MutexLocker locker(m_workItemQueueLock);
     58         m_workItemQueue.swap(workItemQueue);
     59     }
     60 
     61     for (size_t i = 0; i < workItemQueue.size(); ++i) {
     62         OwnPtr<WorkItem> item(workItemQueue[i]);
     63         item->execute();
     64     }
     65 }
     66 
     67 void RunLoop::scheduleWork(PassOwnPtr<WorkItem> item)
     68 {
     69     MutexLocker locker(m_workItemQueueLock);
     70     m_workItemQueue.append(item.leakPtr());
     71 
     72     wakeUp();
     73 }
     74