1 /* 2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef Timer_h 27 #define Timer_h 28 29 #include <wtf/Noncopyable.h> 30 #include <wtf/Threading.h> 31 32 namespace WebCore { 33 34 // Time intervals are all in seconds. 35 36 class TimerHeapElement; 37 38 class TimerBase { 39 WTF_MAKE_NONCOPYABLE(TimerBase); WTF_MAKE_FAST_ALLOCATED; 40 public: 41 TimerBase(); 42 virtual ~TimerBase(); 43 44 void start(double nextFireInterval, double repeatInterval); 45 46 void startRepeating(double repeatInterval) { start(repeatInterval, repeatInterval); } 47 void startOneShot(double interval) { start(interval, 0); } 48 49 void stop(); 50 bool isActive() const; 51 52 double nextFireInterval() const; 53 double repeatInterval() const { return m_repeatInterval; } 54 55 void augmentFireInterval(double delta) { setNextFireTime(m_nextFireTime + delta); } 56 void augmentRepeatInterval(double delta) { augmentFireInterval(delta); m_repeatInterval += delta; } 57 58 static void fireTimersInNestedEventLoop(); 59 60 private: 61 virtual void fired() = 0; 62 63 void checkConsistency() const; 64 void checkHeapIndex() const; 65 66 void setNextFireTime(double); 67 68 bool inHeap() const { return m_heapIndex != -1; } 69 70 void heapDecreaseKey(); 71 void heapDelete(); 72 void heapDeleteMin(); 73 void heapIncreaseKey(); 74 void heapInsert(); 75 void heapPop(); 76 void heapPopMin(); 77 78 double m_nextFireTime; // 0 if inactive 79 double m_repeatInterval; // 0 if not repeating 80 int m_heapIndex; // -1 if not in heap 81 unsigned m_heapInsertionOrder; // Used to keep order among equal-fire-time timers 82 83 #ifndef NDEBUG 84 ThreadIdentifier m_thread; 85 #endif 86 87 friend class TimerHeapElement; 88 friend class ThreadTimers; 89 friend bool operator<(const TimerHeapElement&, const TimerHeapElement&); 90 }; 91 92 template <typename TimerFiredClass> class Timer : public TimerBase { 93 public: 94 typedef void (TimerFiredClass::*TimerFiredFunction)(Timer*); 95 96 Timer(TimerFiredClass* o, TimerFiredFunction f) 97 : m_object(o), m_function(f) { } 98 99 private: 100 virtual void fired() { (m_object->*m_function)(this); } 101 102 TimerFiredClass* m_object; 103 TimerFiredFunction m_function; 104 }; 105 106 inline bool TimerBase::isActive() const 107 { 108 ASSERT(m_thread == currentThread()); 109 return m_nextFireTime; 110 } 111 112 } 113 114 #endif 115