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 "ThreadTimers.h" |
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#include "SharedTimer.h" |
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#include "ThreadGlobalData.h" |
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#include "Timer.h" |
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#include <wtf/CurrentTime.h> |
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namespace WebCore { |
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// Fire timers for this length of time, and then quit to let the run loop process user input events. |
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// 100ms is about a perceptable delay in UI, so use a half of that as a threshold. |
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// This is to prevent UI freeze when there are too many timers or machine performance is low. |
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static const double maxDurationOfFiringTimers = 0.050; |
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|
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// Timers are created, started and fired on the same thread, and each thread has its own ThreadTimers |
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// copy to keep the heap and a set of currently firing timers. |
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static MainThreadSharedTimer* mainThreadSharedTimer() |
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{ |
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static MainThreadSharedTimer* timer = new MainThreadSharedTimer; |
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return timer; |
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} |
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ThreadTimers::ThreadTimers() |
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: m_sharedTimer(0) |
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, m_firingTimers(false) |
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{ |
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if (isMainThread()) |
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setSharedTimer(mainThreadSharedTimer()); |
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} |
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// A worker thread may initialize SharedTimer after some timers are created. |
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// Also, SharedTimer can be replaced with 0 before all timers are destroyed. |
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void ThreadTimers::setSharedTimer(SharedTimer* sharedTimer) |
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{ |
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if (m_sharedTimer) { |
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m_sharedTimer->setFiredFunction(0); |
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m_sharedTimer->stop(); |
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} |
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m_sharedTimer = sharedTimer; |
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if (sharedTimer) { |
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m_sharedTimer->setFiredFunction(ThreadTimers::sharedTimerFired); |
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updateSharedTimer(); |
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} |
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} |
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void ThreadTimers::updateSharedTimer() |
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{ |
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if (!m_sharedTimer) |
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return; |
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if (m_firingTimers || m_timerHeap.isEmpty()) |
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m_sharedTimer->stop(); |
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else |
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m_sharedTimer->setFireTime(m_timerHeap.first()->m_nextFireTime); |
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} |
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|
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void ThreadTimers::sharedTimerFired() |
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{ |
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// Redirect to non-static method. |
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threadGlobalData().threadTimers().sharedTimerFiredInternal(); |
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} |
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void ThreadTimers::sharedTimerFiredInternal() |
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{ |
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// Do a re-entrancy check. |
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if (m_firingTimers) |
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return; |
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m_firingTimers = true; |
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double fireTime = currentTime(); |
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double timeToQuit = fireTime + maxDurationOfFiringTimers; |
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while (!m_timerHeap.isEmpty() && m_timerHeap.first()->m_nextFireTime <= fireTime) { |
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TimerBase* timer = m_timerHeap.first(); |
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timer->m_nextFireTime = 0; |
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timer->heapDeleteMin(); |
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107 |
|
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double interval = timer->repeatInterval(); |
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timer->setNextFireTime(interval ? fireTime + interval : 0); |
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110 |
|
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// Once the timer has been fired, it may be deleted, so do nothing else with it after this point. |
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timer->fired(); |
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113 |
|
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// Catch the case where the timer asked timers to fire in a nested event loop, or we are over time limit. |
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if (!m_firingTimers || timeToQuit < currentTime()) |
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break; |
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117 |
} |
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118 |
|
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m_firingTimers = false; |
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120 |
|
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updateSharedTimer(); |
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} |
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|
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void ThreadTimers::fireTimersInNestedEventLoop() |
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{ |
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// Reset the reentrancy guard so the timers can fire again. |
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m_firingTimers = false; |
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updateSharedTimer(); |
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} |
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|
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} // namespace WebCore |
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132 |