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      1 /*
      2  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
      3  * Copyright (C) 2009 Google Inc.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #ifndef ThreadTimers_h
     28 #define ThreadTimers_h
     29 
     30 #include <wtf/Noncopyable.h>
     31 #include <wtf/HashSet.h>
     32 #include <wtf/Vector.h>
     33 
     34 namespace WebCore {
     35 
     36     class SharedTimer;
     37     class TimerBase;
     38 
     39     // A collection of timers per thread. Kept in ThreadGlobalData.
     40     class ThreadTimers {
     41         WTF_MAKE_NONCOPYABLE(ThreadTimers); WTF_MAKE_FAST_ALLOCATED;
     42     public:
     43         ThreadTimers();
     44 
     45         // On a thread different then main, we should set the thread's instance of the SharedTimer.
     46         void setSharedTimer(SharedTimer*);
     47 
     48         Vector<TimerBase*>& timerHeap() { return m_timerHeap; }
     49 
     50         void updateSharedTimer();
     51         void fireTimersInNestedEventLoop();
     52 
     53     private:
     54         static void sharedTimerFired();
     55 
     56         void sharedTimerFiredInternal();
     57         void fireTimersInNestedEventLoopInternal();
     58 
     59         Vector<TimerBase*> m_timerHeap;
     60         SharedTimer* m_sharedTimer; // External object, can be a run loop on a worker thread. Normally set/reset by worker thread.
     61         bool m_firingTimers; // Reentrancy guard.
     62     };
     63 
     64 }
     65 
     66 #endif
     67