165 lines
5.5 KiB
C++
165 lines
5.5 KiB
C++
/*
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* Copyright (C) 2006-2016 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 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 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 "MainThreadSharedTimer.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/MainThread.h>
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#if PLATFORM(IOS_FAMILY)
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#include "WebCoreThread.h"
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#endif
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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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static constexpr auto maxDurationOfFiringTimers { 16_ms };
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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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ThreadTimers::ThreadTimers()
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{
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if (isUIThread())
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setSharedTimer(&MainThreadSharedTimer::singleton());
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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 nullptr 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(nullptr);
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m_sharedTimer->stop();
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m_pendingSharedTimerFireTime = MonotonicTime { };
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}
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m_sharedTimer = sharedTimer;
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if (sharedTimer) {
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m_sharedTimer->setFiredFunction([] { threadGlobalData().threadTimers().sharedTimerFiredInternal(); });
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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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while (!m_timerHeap.isEmpty() && !m_timerHeap.first()->hasTimer()) {
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ASSERT_NOT_REACHED();
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TimerBase::heapDeleteNullMin(m_timerHeap);
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}
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ASSERT(m_timerHeap.isEmpty() || m_timerHeap.first()->hasTimer());
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if (m_firingTimers || m_timerHeap.isEmpty()) {
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m_pendingSharedTimerFireTime = MonotonicTime { };
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m_sharedTimer->stop();
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} else {
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MonotonicTime nextFireTime = m_timerHeap.first()->time;
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MonotonicTime currentMonotonicTime = MonotonicTime::now();
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if (m_pendingSharedTimerFireTime) {
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// No need to restart the timer if both the pending fire time and the new fire time are in the past.
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if (m_pendingSharedTimerFireTime <= currentMonotonicTime && nextFireTime <= currentMonotonicTime)
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return;
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}
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m_pendingSharedTimerFireTime = nextFireTime;
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m_sharedTimer->setFireInterval(std::max(nextFireTime - currentMonotonicTime, 0_s));
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}
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}
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void ThreadTimers::sharedTimerFiredInternal()
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{
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ASSERT(isMainThread() || (!isWebThread() && !isUIThread()));
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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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m_pendingSharedTimerFireTime = MonotonicTime { };
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MonotonicTime fireTime = MonotonicTime::now();
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MonotonicTime timeToQuit = fireTime + maxDurationOfFiringTimers;
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while (!m_timerHeap.isEmpty()) {
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Ref<ThreadTimerHeapItem> item = *m_timerHeap.first();
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ASSERT(item->hasTimer());
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if (!item->hasTimer()) {
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TimerBase::heapDeleteNullMin(m_timerHeap);
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continue;
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}
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if (item->time > fireTime)
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break;
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auto& timer = item->timer();
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Seconds interval = timer.repeatInterval();
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timer.setNextFireTime(interval ? fireTime + interval : MonotonicTime { });
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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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item->timer().fired();
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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 < MonotonicTime::now())
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break;
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if (m_shouldBreakFireLoopForRenderingUpdate)
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break;
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}
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m_firingTimers = false;
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m_shouldBreakFireLoopForRenderingUpdate = false;
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updateSharedTimer();
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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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if (m_sharedTimer) {
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m_sharedTimer->invalidate();
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m_pendingSharedTimerFireTime = MonotonicTime { };
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}
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updateSharedTimer();
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}
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void ThreadTimers::breakFireLoopForRenderingUpdate()
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{
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if (!m_firingTimers)
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return;
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m_shouldBreakFireLoopForRenderingUpdate = true;
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}
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} // namespace WebCore
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