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/*
* 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 Timer_h
#define Timer_h
#include <wtf/Noncopyable.h>
#include <wtf/Threading.h>
namespace WebCore {
// Time intervals are all in seconds.
class TimerHeapElement;
class TimerBase {
WTF_MAKE_NONCOPYABLE(TimerBase); WTF_MAKE_FAST_ALLOCATED;
public:
TimerBase();
virtual ~TimerBase();
void start(double nextFireInterval, double repeatInterval);
void startRepeating(double repeatInterval) { start(repeatInterval, repeatInterval); }
void startOneShot(double interval) { start(interval, 0); }
void stop();
bool isActive() const;
double nextFireInterval() const;
double repeatInterval() const { return m_repeatInterval; }
void augmentFireInterval(double delta) { setNextFireTime(m_nextFireTime + delta); }
void augmentRepeatInterval(double delta) { augmentFireInterval(delta); m_repeatInterval += delta; }
static void fireTimersInNestedEventLoop();
private:
virtual void fired() = 0;
void checkConsistency() const;
void checkHeapIndex() const;
void setNextFireTime(double);
bool inHeap() const { return m_heapIndex != -1; }
void heapDecreaseKey();
void heapDelete();
void heapDeleteMin();
void heapIncreaseKey();
void heapInsert();
void heapPop();
void heapPopMin();
double m_nextFireTime; // 0 if inactive
double m_repeatInterval; // 0 if not repeating
int m_heapIndex; // -1 if not in heap
unsigned m_heapInsertionOrder; // Used to keep order among equal-fire-time timers
#ifndef NDEBUG
ThreadIdentifier m_thread;
#endif
friend class ThreadTimers;
friend class TimerHeapLessThanFunction;
friend class TimerHeapReference;
};
template <typename TimerFiredClass> class Timer : public TimerBase {
public:
typedef void (TimerFiredClass::*TimerFiredFunction)(Timer*);
Timer(TimerFiredClass* o, TimerFiredFunction f)
: m_object(o), m_function(f) { }
private:
virtual void fired() { (m_object->*m_function)(this); }
TimerFiredClass* m_object;
TimerFiredFunction m_function;
};
inline bool TimerBase::isActive() const
{
ASSERT(m_thread == currentThread());
return m_nextFireTime;
}
template <typename TimerFiredClass> class DeferrableOneShotTimer : private TimerBase {
public:
typedef void (TimerFiredClass::*TimerFiredFunction)(DeferrableOneShotTimer*);
DeferrableOneShotTimer(TimerFiredClass* o, TimerFiredFunction f, double delay)
: m_object(o)
, m_function(f)
, m_delay(delay)
, m_shouldRestartWhenTimerFires(false)
{
}
void restart()
{
// Setting this boolean is much more efficient than calling startOneShot
// again, which might result in rescheduling the system timer which
// can be quite expensive.
if (isActive()) {
m_shouldRestartWhenTimerFires = true;
return;
}
startOneShot(m_delay);
}
using TimerBase::stop;
using TimerBase::isActive;
private:
virtual void fired()
{
if (m_shouldRestartWhenTimerFires) {
m_shouldRestartWhenTimerFires = false;
startOneShot(m_delay);
return;
}
(m_object->*m_function)(this);
}
TimerFiredClass* m_object;
TimerFiredFunction m_function;
double m_delay;
bool m_shouldRestartWhenTimerFires;
};
}
#endif
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