threadtimers.h

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
 * Copyright (C) 2009 Google Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#ifndef ThreadTimer_h
#define ThreadTimer_h

#include <wtf/Noncopyable.h>
#include <wtf/HashSet.h>
#include <wtf/Vector.h>

namespace WebCore {

    class SharedTimer;
    class TimerBase;

    // A collection of timers per thread. Kept in ThreadGlobalData.
    class ThreadTimers : Noncopyable {
    public:
        ThreadTimers();

        // On a thread different then main, we should set the thread's instance of the SharedTimer.
        void setSharedTimer(SharedTimer*);

        Vector<TimerBase*>& timerHeap() { return m_timerHeap; }
        HashSet<const TimerBase*>& timersReadyToFire() { return m_timersReadyToFire; }

        void updateSharedTimer();
        void fireTimersInNestedEventLoop();

    private:
        static void sharedTimerFired();

        void fireTimers(double fireTime, const Vector<TimerBase*>&);
        void collectFiringTimers(double fireTime, Vector<TimerBase*>&);
        void sharedTimerFiredInternal();
        void fireTimersInNestedEventLoopInternal();

        Vector<TimerBase*> m_timerHeap;
        HashSet<const TimerBase*> m_timersReadyToFire; // Temporarily holds a pointer to a stack object. No ownership.
        SharedTimer* m_sharedTimer; // External object, can be a run loop on a worker thread. Normally set/reset by worker thread.
        bool m_firingTimers; // Reentrancy guard.
    };

}

#endif