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29 #include "platform/PlatformExport.h"
30 #include "platform/TraceLocation.h"
31 #include "wtf/Noncopyable.h"
32 #include "wtf/Threading.h"
33 #include "wtf/Vector.h"
37 // Time intervals are all in seconds.
39 class TimerHeapElement;
41 class PLATFORM_EXPORT TimerBase {
42 WTF_MAKE_NONCOPYABLE(TimerBase); WTF_MAKE_FAST_ALLOCATED;
47 void start(double nextFireInterval, double repeatInterval, const TraceLocation&);
49 void startRepeating(double repeatInterval, const TraceLocation& caller)
51 start(repeatInterval, repeatInterval, caller);
53 void startOneShot(double interval, const TraceLocation& caller)
55 start(interval, 0, caller);
59 bool isActive() const;
60 const TraceLocation& location() const { return m_location; }
62 double nextFireInterval() const;
63 double nextUnalignedFireInterval() const;
64 double repeatInterval() const { return m_repeatInterval; }
66 void augmentRepeatInterval(double delta) {
67 setNextFireTime(m_nextFireTime + delta);
68 m_repeatInterval += delta;
71 void didChangeAlignmentInterval();
73 static void fireTimersInNestedEventLoop();
76 virtual void fired() = 0;
78 virtual double alignedFireTime(double fireTime) const { return fireTime; }
80 void checkConsistency() const;
81 void checkHeapIndex() const;
83 void setNextFireTime(double);
85 bool inHeap() const { return m_heapIndex != -1; }
87 bool hasValidHeapPosition() const;
88 void updateHeapIfNeeded(double oldTime);
90 void heapDecreaseKey();
93 void heapIncreaseKey();
98 Vector<TimerBase*>& timerHeap() const { ASSERT(m_cachedThreadGlobalTimerHeap); return *m_cachedThreadGlobalTimerHeap; }
100 double m_nextFireTime; // 0 if inactive
101 double m_unalignedNextFireTime; // m_nextFireTime not considering alignment interval
102 double m_repeatInterval; // 0 if not repeating
103 int m_heapIndex; // -1 if not in heap
104 unsigned m_heapInsertionOrder; // Used to keep order among equal-fire-time timers
105 Vector<TimerBase*>* m_cachedThreadGlobalTimerHeap;
106 TraceLocation m_location;
109 ThreadIdentifier m_thread;
112 friend class ThreadTimers;
113 friend class TimerHeapLessThanFunction;
114 friend class TimerHeapReference;
117 template <typename TimerFiredClass>
118 class Timer FINAL : public TimerBase {
120 typedef void (TimerFiredClass::*TimerFiredFunction)(Timer*);
122 Timer(TimerFiredClass* o, TimerFiredFunction f)
123 : m_object(o), m_function(f) { }
126 virtual void fired() OVERRIDE { (m_object->*m_function)(this); }
128 // FIXME: oilpan: TimerBase should be moved to the heap and m_object should be traced.
129 // This raw pointer is safe as long as Timer<X> is held by the X itself (That's the case
130 // in the current code base).
131 TimerFiredClass* m_object;
132 TimerFiredFunction m_function;
135 inline bool TimerBase::isActive() const
137 ASSERT(m_thread == currentThread());
138 return m_nextFireTime;
141 template <typename TimerFiredClass>
142 class DeferrableOneShotTimer FINAL : private TimerBase {
144 typedef void (TimerFiredClass::*TimerFiredFunction)(DeferrableOneShotTimer*);
146 DeferrableOneShotTimer(TimerFiredClass* o, TimerFiredFunction f, double delay)
150 , m_shouldRestartWhenTimerFires(false)
154 void restart(const TraceLocation& caller)
156 // Setting this boolean is much more efficient than calling startOneShot
157 // again, which might result in rescheduling the system timer which
158 // can be quite expensive.
161 m_shouldRestartWhenTimerFires = true;
164 startOneShot(m_delay, caller);
167 using TimerBase::stop;
168 using TimerBase::isActive;
171 virtual void fired() OVERRIDE
173 if (m_shouldRestartWhenTimerFires) {
174 m_shouldRestartWhenTimerFires = false;
175 // FIXME: This should not be FROM_HERE.
176 startOneShot(m_delay, FROM_HERE);
180 (m_object->*m_function)(this);
183 // FIXME: oilpan: TimerBase should be moved to the heap and m_object should be traced.
184 // This raw pointer is safe as long as Timer<X> is held by the X itself (That's the case
185 // in the current code base).
186 TimerFiredClass* m_object;
187 TimerFiredFunction m_function;
190 bool m_shouldRestartWhenTimerFires;