1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/*
* 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>
#include <wtf/Vector.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 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;
};
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 : protected 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);
}
void stop()
{
m_shouldRestartWhenTimerFires = false;
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
|
