/*

 * Copyright (C) 2006 Apple Computer, 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 SharedTimer_h

#define SharedTimer_h

#include <wtf/Noncopyable.h>

namespace WebCore {

    // Each thread has its own single instance of shared timer, which implements this interface.

    // This instance is shared by all timers in the thread.

    // Not intended to be used directly; use the Timer class instead.

    class SharedTimer : public Noncopyable {

    public:

        virtual ~SharedTimer() {}

        virtual void setFiredFunction(void (*)()) = 0;

        // The fire time is relative to the classic POSIX epoch of January 1, 1970,

        // as the result of currentTime() is.

        virtual void setFireTime(double) = 0;

        virtual void stop() = 0;

    };

    // Implemented by port (since it provides the run loop for the main thread).

    // FIXME: make ports implement MainThreadSharedTimer directly instead.

    void setSharedTimerFiredFunction(void (*)());

    void setSharedTimerFireTime(double);

    void stopSharedTimer();

    // Implementation of SharedTimer for the main thread.

    class MainThreadSharedTimer : public SharedTimer {

    public:

        virtual void setFiredFunction(void (*function)())

        {

            setSharedTimerFiredFunction(function);

        }

        virtual void setFireTime(double fireTime)

        {

            setSharedTimerFireTime(fireTime);

        }

        virtual void stop()

        {

            stopSharedTimer();

        }

    };

} // namespace WebCore

#endif // SharedTimer_h