author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 04 Oct 2010 01:32:07 +0300 | |
changeset 2 | 303757a437d3 |
parent 0 | 4f2f89ce4247 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (C) 2006, 2008 Apple Inc. All rights reserved. |
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* Copyright (C) 2009 Google Inc. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "config.h" |
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#include "Timer.h" |
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#include "SharedTimer.h" |
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#include "ThreadGlobalData.h" |
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#include "ThreadTimers.h" |
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#include <limits.h> |
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#include <limits> |
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#include <math.h> |
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#include <wtf/CurrentTime.h> |
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#include <wtf/HashSet.h> |
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#include <wtf/Vector.h> |
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|
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using namespace std; |
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namespace WebCore { |
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|
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// Timers are stored in a heap data structure, used to implement a priority queue. |
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// This allows us to efficiently determine which timer needs to fire the soonest. |
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// Then we set a single shared system timer to fire at that time. |
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// |
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// When a timer's "next fire time" changes, we need to move it around in the priority queue. |
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// Simple accessors to thread-specific data. |
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static Vector<TimerBase*>& timerHeap() |
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{ |
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return threadGlobalData().threadTimers().timerHeap(); |
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} |
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// Class to represent elements in the heap when calling the standard library heap algorithms. |
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// Maintains the m_heapIndex value in the timers themselves, which allows us to do efficient |
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// modification of the heap. |
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class TimerHeapElement { |
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public: |
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explicit TimerHeapElement(int i) |
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: m_index(i) |
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, m_timer(timerHeap()[m_index]) |
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{ |
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checkConsistency(); |
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} |
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TimerHeapElement(const TimerHeapElement&); |
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TimerHeapElement& operator=(const TimerHeapElement&); |
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TimerBase* timer() const { return m_timer; } |
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void checkConsistency() const |
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{ |
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ASSERT(m_index >= 0); |
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ASSERT(m_index < static_cast<int>(timerHeap().size())); |
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} |
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private: |
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TimerHeapElement(); |
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int m_index; |
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TimerBase* m_timer; |
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}; |
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inline TimerHeapElement::TimerHeapElement(const TimerHeapElement& o) |
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: m_index(-1), m_timer(o.timer()) |
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{ |
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} |
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inline TimerHeapElement& TimerHeapElement::operator=(const TimerHeapElement& o) |
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{ |
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TimerBase* t = o.timer(); |
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m_timer = t; |
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if (m_index != -1) { |
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checkConsistency(); |
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timerHeap()[m_index] = t; |
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t->m_heapIndex = m_index; |
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} |
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return *this; |
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} |
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inline bool operator<(const TimerHeapElement& a, const TimerHeapElement& b) |
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{ |
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// The comparisons below are "backwards" because the heap puts the largest |
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// element first and we want the lowest time to be the first one in the heap. |
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double aFireTime = a.timer()->m_nextFireTime; |
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double bFireTime = b.timer()->m_nextFireTime; |
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if (bFireTime != aFireTime) |
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return bFireTime < aFireTime; |
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|
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// We need to look at the difference of the insertion orders instead of comparing the two |
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// outright in case of overflow. |
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unsigned difference = a.timer()->m_heapInsertionOrder - b.timer()->m_heapInsertionOrder; |
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return difference < UINT_MAX / 2; |
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} |
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|
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// ---------------- |
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|
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// Class to represent iterators in the heap when calling the standard library heap algorithms. |
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// Returns TimerHeapElement for elements in the heap rather than the TimerBase pointers themselves. |
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class TimerHeapIterator : public iterator<random_access_iterator_tag, TimerHeapElement, int> { |
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public: |
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TimerHeapIterator() : m_index(-1) { } |
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TimerHeapIterator(int i) : m_index(i) { checkConsistency(); } |
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|
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TimerHeapIterator& operator++() { checkConsistency(); ++m_index; checkConsistency(); return *this; } |
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TimerHeapIterator operator++(int) { checkConsistency(); checkConsistency(1); return m_index++; } |
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|
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TimerHeapIterator& operator--() { checkConsistency(); --m_index; checkConsistency(); return *this; } |
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TimerHeapIterator operator--(int) { checkConsistency(); checkConsistency(-1); return m_index--; } |
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|
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TimerHeapIterator& operator+=(int i) { checkConsistency(); m_index += i; checkConsistency(); return *this; } |
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TimerHeapIterator& operator-=(int i) { checkConsistency(); m_index -= i; checkConsistency(); return *this; } |
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|
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TimerHeapElement operator*() const { return TimerHeapElement(m_index); } |
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TimerHeapElement operator[](int i) const { return TimerHeapElement(m_index + i); } |
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|
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int index() const { return m_index; } |
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|
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void checkConsistency(int offset = 0) const |
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{ |
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ASSERT_UNUSED(offset, m_index + offset >= 0); |
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ASSERT_UNUSED(offset, m_index + offset <= static_cast<int>(timerHeap().size())); |
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} |
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private: |
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int m_index; |
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}; |
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inline bool operator==(TimerHeapIterator a, TimerHeapIterator b) { return a.index() == b.index(); } |
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inline bool operator!=(TimerHeapIterator a, TimerHeapIterator b) { return a.index() != b.index(); } |
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inline bool operator<(TimerHeapIterator a, TimerHeapIterator b) { return a.index() < b.index(); } |
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|
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inline TimerHeapIterator operator+(TimerHeapIterator a, int b) { return a.index() + b; } |
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inline TimerHeapIterator operator+(int a, TimerHeapIterator b) { return a + b.index(); } |
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|
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inline TimerHeapIterator operator-(TimerHeapIterator a, int b) { return a.index() - b; } |
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inline int operator-(TimerHeapIterator a, TimerHeapIterator b) { return a.index() - b.index(); } |
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|
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// ---------------- |
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|
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TimerBase::TimerBase() |
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: m_nextFireTime(0) |
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, m_repeatInterval(0) |
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, m_heapIndex(-1) |
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#ifndef NDEBUG |
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, m_thread(currentThread()) |
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#endif |
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{ |
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} |
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|
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TimerBase::~TimerBase() |
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{ |
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stop(); |
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ASSERT(!inHeap()); |
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} |
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|
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void TimerBase::start(double nextFireInterval, double repeatInterval) |
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{ |
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ASSERT(m_thread == currentThread()); |
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m_repeatInterval = repeatInterval; |
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setNextFireTime(currentTime() + nextFireInterval); |
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} |
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|
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void TimerBase::stop() |
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{ |
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ASSERT(m_thread == currentThread()); |
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m_repeatInterval = 0; |
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setNextFireTime(0); |
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ASSERT(m_nextFireTime == 0); |
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ASSERT(m_repeatInterval == 0); |
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ASSERT(!inHeap()); |
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} |
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double TimerBase::nextFireInterval() const |
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{ |
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ASSERT(isActive()); |
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double current = currentTime(); |
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if (m_nextFireTime < current) |
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return 0; |
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return m_nextFireTime - current; |
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} |
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|
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inline void TimerBase::checkHeapIndex() const |
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{ |
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ASSERT(!timerHeap().isEmpty()); |
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ASSERT(m_heapIndex >= 0); |
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ASSERT(m_heapIndex < static_cast<int>(timerHeap().size())); |
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ASSERT(timerHeap()[m_heapIndex] == this); |
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} |
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215 |
|
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inline void TimerBase::checkConsistency() const |
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{ |
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// Timers should be in the heap if and only if they have a non-zero next fire time. |
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ASSERT(inHeap() == (m_nextFireTime != 0)); |
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if (inHeap()) |
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checkHeapIndex(); |
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} |
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|
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void TimerBase::heapDecreaseKey() |
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{ |
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ASSERT(m_nextFireTime != 0); |
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checkHeapIndex(); |
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push_heap(TimerHeapIterator(0), TimerHeapIterator(m_heapIndex + 1)); |
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checkHeapIndex(); |
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} |
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231 |
|
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inline void TimerBase::heapDelete() |
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{ |
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ASSERT(m_nextFireTime == 0); |
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heapPop(); |
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timerHeap().removeLast(); |
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m_heapIndex = -1; |
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} |
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|
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void TimerBase::heapDeleteMin() |
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241 |
{ |
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ASSERT(m_nextFireTime == 0); |
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heapPopMin(); |
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timerHeap().removeLast(); |
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m_heapIndex = -1; |
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} |
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|
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inline void TimerBase::heapIncreaseKey() |
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{ |
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ASSERT(m_nextFireTime != 0); |
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heapPop(); |
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heapDecreaseKey(); |
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} |
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|
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inline void TimerBase::heapInsert() |
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{ |
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ASSERT(!inHeap()); |
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timerHeap().append(this); |
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m_heapIndex = timerHeap().size() - 1; |
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heapDecreaseKey(); |
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} |
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|
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inline void TimerBase::heapPop() |
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{ |
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// Temporarily force this timer to have the minimum key so we can pop it. |
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double fireTime = m_nextFireTime; |
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m_nextFireTime = -numeric_limits<double>::infinity(); |
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heapDecreaseKey(); |
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heapPopMin(); |
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m_nextFireTime = fireTime; |
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} |
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272 |
|
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void TimerBase::heapPopMin() |
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{ |
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ASSERT(this == timerHeap().first()); |
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checkHeapIndex(); |
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pop_heap(TimerHeapIterator(0), TimerHeapIterator(timerHeap().size())); |
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checkHeapIndex(); |
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ASSERT(this == timerHeap().last()); |
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} |
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|
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void TimerBase::setNextFireTime(double newTime) |
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{ |
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ASSERT(m_thread == currentThread()); |
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|
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// Keep heap valid while changing the next-fire time. |
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double oldTime = m_nextFireTime; |
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if (oldTime != newTime) { |
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m_nextFireTime = newTime; |
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static unsigned currentHeapInsertionOrder; |
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m_heapInsertionOrder = currentHeapInsertionOrder++; |
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|
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bool wasFirstTimerInHeap = m_heapIndex == 0; |
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|
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if (oldTime == 0) |
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heapInsert(); |
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else if (newTime == 0) |
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heapDelete(); |
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else if (newTime < oldTime) |
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heapDecreaseKey(); |
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else |
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heapIncreaseKey(); |
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|
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bool isFirstTimerInHeap = m_heapIndex == 0; |
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|
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if (wasFirstTimerInHeap || isFirstTimerInHeap) |
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threadGlobalData().threadTimers().updateSharedTimer(); |
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} |
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309 |
|
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checkConsistency(); |
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} |
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void TimerBase::fireTimersInNestedEventLoop() |
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{ |
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// Redirect to ThreadTimers. |
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threadGlobalData().threadTimers().fireTimersInNestedEventLoop(); |
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} |
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} // namespace WebCore |
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