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/*
* Copyright (C) 2006 Apple 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 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 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 <chrono>
#include <functional>
#include <wtf/Noncopyable.h>
#include <wtf/Threading.h>
#include <wtf/Vector.h>
#if PLATFORM(IOS)
#include "WebCoreThread.h"
#endif
namespace WebCore {
// Time intervals are all in seconds.
class TimerHeapElement;
class TimerBase {
WTF_MAKE_NONCOPYABLE(TimerBase);
WTF_MAKE_FAST_ALLOCATED;
public:
WEBCORE_EXPORT TimerBase();
WEBCORE_EXPORT virtual ~TimerBase();
WEBCORE_EXPORT void start(double nextFireInterval, double repeatInterval);
void startRepeating(double repeatInterval) { start(repeatInterval, repeatInterval); }
void startRepeating(std::chrono::milliseconds repeatInterval) { startRepeating(repeatInterval.count() * 0.001); }
void startOneShot(double interval) { start(interval, 0); }
void startOneShot(std::chrono::milliseconds interval) { startOneShot(interval.count() * 0.001); }
WEBCORE_EXPORT void stop();
bool isActive() const;
double nextFireInterval() const;
double nextUnalignedFireInterval() const;
double repeatInterval() const { return m_repeatInterval; }
void augmentFireInterval(double delta) { setNextFireTime(m_nextFireTime + delta); }
void augmentRepeatInterval(double delta) { augmentFireInterval(delta); m_repeatInterval += delta; }
void didChangeAlignmentInterval();
static void fireTimersInNestedEventLoop();
private:
virtual void fired() = 0;
virtual double alignedFireTime(double fireTime) const { return fireTime; }
void checkConsistency() const;
void checkHeapIndex() const;
void setNextFireTime(double);
bool inHeap() const { return m_heapIndex != -1; }
bool hasValidHeapPosition() const;
void updateHeapIfNeeded(double oldTime);
void heapDecreaseKey();
void heapDelete();
void heapDeleteMin();
void heapIncreaseKey();
void heapInsert();
void heapPop();
void heapPopMin();
Vector<TimerBase*>& timerHeap() const { ASSERT(m_cachedThreadGlobalTimerHeap); return *m_cachedThreadGlobalTimerHeap; }
double m_nextFireTime; // 0 if inactive
double m_unalignedNextFireTime; // m_nextFireTime not considering alignment interval
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
Vector<TimerBase*>* m_cachedThreadGlobalTimerHeap;
#ifndef NDEBUG
ThreadIdentifier m_thread;
bool m_wasDeleted;
#endif
friend class ThreadTimers;
friend class TimerHeapLessThanFunction;
friend class TimerHeapReference;
};
class Timer : public TimerBase {
WTF_MAKE_FAST_ALLOCATED;
public:
template <typename TimerFiredClass, typename TimerFiredBaseClass>
Timer(TimerFiredClass& object, void (TimerFiredBaseClass::*function)())
: m_function(std::bind(function, &object))
{
}
Timer(std::function<void ()> function)
: m_function(WTFMove(function))
{
}
private:
virtual void fired() override
{
m_function();
}
std::function<void ()> m_function;
};
inline bool TimerBase::isActive() const
{
// FIXME: Write this in terms of USE(WEB_THREAD) instead of PLATFORM(IOS).
#if !PLATFORM(IOS)
ASSERT(m_thread == currentThread());
#else
ASSERT(WebThreadIsCurrent() || pthread_main_np() || m_thread == currentThread());
#endif // PLATFORM(IOS)
return m_nextFireTime;
}
class DeferrableOneShotTimer : protected TimerBase {
public:
template<typename TimerFiredClass>
DeferrableOneShotTimer(TimerFiredClass& object, void (TimerFiredClass::*function)(), std::chrono::milliseconds delay)
: DeferrableOneShotTimer(std::bind(function, &object), delay)
{
}
DeferrableOneShotTimer(std::function<void ()> function, std::chrono::milliseconds delay)
: m_function(WTFMove(function))
, 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);
}
void stop()
{
m_shouldRestartWhenTimerFires = false;
TimerBase::stop();
}
using TimerBase::isActive;
private:
virtual void fired() override
{
if (m_shouldRestartWhenTimerFires) {
m_shouldRestartWhenTimerFires = false;
startOneShot(m_delay);
return;
}
m_function();
}
std::function<void ()> m_function;
std::chrono::milliseconds m_delay;
bool m_shouldRestartWhenTimerFires;
};
}
#endif
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