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/*
* Copyright (C) 2006 Apple Inc. All rights reserved.
* Copyright (C) 2009 Google 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 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 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 ThreadTimers_h
#define ThreadTimers_h
#include <wtf/MonotonicTime.h>
#include <wtf/Noncopyable.h>
#include <wtf/RefCounted.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/ThreadSafeRefCounted.h>
#include <wtf/Vector.h>
namespace WebCore {
class SharedTimer;
class ThreadTimers;
class TimerBase;
struct ThreadTimerHeapItem;
typedef Vector<RefPtr<ThreadTimerHeapItem>> ThreadTimerHeap;
// A collection of timers per thread. Kept in ThreadGlobalData.
class ThreadTimers {
WTF_MAKE_TZONE_ALLOCATED(ThreadTimers);
WTF_MAKE_NONCOPYABLE(ThreadTimers);
public:
ThreadTimers();
// Fire timers for this length of time, and then quit to let the run loop process user input events.
static constexpr auto maxDurationOfFiringTimers { 16_ms };
// On a thread different then main, we should set the thread's instance of the SharedTimer.
void setSharedTimer(SharedTimer*);
ThreadTimerHeap& timerHeap() { return m_timerHeap; }
void updateSharedTimer();
void fireTimersInNestedEventLoop();
void breakFireLoopForRenderingUpdate();
unsigned nextHeapInsertionCount() { return m_currentHeapInsertionOrder++; }
private:
void sharedTimerFiredInternal();
void fireTimersInNestedEventLoopInternal();
ThreadTimerHeap m_timerHeap;
SharedTimer* m_sharedTimer { nullptr }; // External object, can be a run loop on a worker thread. Normally set/reset by worker thread.
bool m_firingTimers { false };
bool m_shouldBreakFireLoopForRenderingUpdate { false };
unsigned m_currentHeapInsertionOrder { 0 };
MonotonicTime m_pendingSharedTimerFireTime;
};
struct ThreadTimerHeapItem : ThreadSafeRefCounted<ThreadTimerHeapItem> {
WTF_MAKE_COMPACT_TZONE_OR_ISO_ALLOCATED(ThreadTimerHeapItem);
public:
static RefPtr<ThreadTimerHeapItem> create(TimerBase&, MonotonicTime, unsigned);
bool hasTimer() const { return m_timer; }
TimerBase& timer();
void clearTimer();
ThreadTimerHeap& timerHeap() const;
unsigned heapIndex() const;
void setHeapIndex(unsigned newIndex);
void setNotInHeap() { m_heapIndex = invalidHeapIndex; }
bool isInHeap() const { return m_heapIndex != invalidHeapIndex; }
bool isFirstInHeap() const { return !m_heapIndex; }
MonotonicTime time;
unsigned insertionOrder { 0 };
private:
ThreadTimers& m_threadTimers;
TimerBase* m_timer { nullptr };
unsigned m_heapIndex { invalidHeapIndex };
static const unsigned invalidHeapIndex = static_cast<unsigned>(-1);
ThreadTimerHeapItem(TimerBase&, MonotonicTime, unsigned);
};
inline TimerBase& ThreadTimerHeapItem::timer()
{
ASSERT(m_timer);
return *m_timer;
}
inline void ThreadTimerHeapItem::clearTimer()
{
ASSERT(!isInHeap());
m_timer = nullptr;
}
inline unsigned ThreadTimerHeapItem::heapIndex() const
{
ASSERT(m_heapIndex != invalidHeapIndex);
return static_cast<unsigned>(m_heapIndex);
}
inline void ThreadTimerHeapItem::setHeapIndex(unsigned newIndex)
{
ASSERT(newIndex != invalidHeapIndex);
m_heapIndex = newIndex;
}
inline ThreadTimerHeap& ThreadTimerHeapItem::timerHeap() const
{
return m_threadTimers.timerHeap();
}
}
#endif
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