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/*
* Copyright (C) 2006 Apple Computer, 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 COMPUTER, 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 COMPUTER, 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_TIMER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_TIMER_H_
#include "base/location.h"
#include "base/memory/weak_ptr.h"
#include "base/single_thread_task_runner.h"
#include "base/time/time.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/address_sanitizer.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/noncopyable.h"
#include "third_party/blink/renderer/platform/wtf/threading.h"
#include "third_party/blink/renderer/platform/wtf/time.h"
namespace blink {
// Time intervals are all in seconds.
class PLATFORM_EXPORT TimerBase {
WTF_MAKE_NONCOPYABLE(TimerBase);
public:
explicit TimerBase(scoped_refptr<base::SingleThreadTaskRunner>);
virtual ~TimerBase();
void Start(TimeDelta next_fire_interval,
TimeDelta repeat_interval,
const base::Location&);
void StartRepeating(TimeDelta repeat_interval, const base::Location& caller) {
Start(repeat_interval, repeat_interval, caller);
}
void StartOneShot(TimeDelta interval, const base::Location& caller) {
Start(interval, TimeDelta(), caller);
}
// Timer cancellation is fast enough that you shouldn't have to worry
// about it unless you're canceling tens of thousands of tasks.
virtual void Stop();
bool IsActive() const;
const base::Location& GetLocation() const { return location_; }
TimeDelta NextFireInterval() const;
TimeDelta RepeatInterval() const { return repeat_interval_; }
void AugmentRepeatInterval(TimeDelta delta) {
TimeTicks now = TimerCurrentTimeTicks();
SetNextFireTime(now, std::max(next_fire_time_ - now + delta, TimeDelta()));
repeat_interval_ += delta;
}
void MoveToNewTaskRunner(scoped_refptr<base::SingleThreadTaskRunner>);
struct PLATFORM_EXPORT Comparator {
bool operator()(const TimerBase* a, const TimerBase* b) const;
};
private:
virtual void Fired() = 0;
virtual scoped_refptr<base::SingleThreadTaskRunner> TimerTaskRunner() const;
NO_SANITIZE_ADDRESS
virtual bool CanFire() const { return true; }
TimeTicks TimerCurrentTimeTicks() const;
void SetNextFireTime(TimeTicks now, TimeDelta delay);
void RunInternal();
TimeTicks next_fire_time_; // 0 if inactive
TimeDelta repeat_interval_; // 0 if not repeating
base::Location location_;
scoped_refptr<base::SingleThreadTaskRunner> web_task_runner_;
#if DCHECK_IS_ON()
ThreadIdentifier thread_;
#endif
base::WeakPtrFactory<TimerBase> weak_ptr_factory_;
friend class ThreadTimers;
friend class TimerHeapLessThanFunction;
friend class TimerHeapReference;
};
template <typename T, bool = IsGarbageCollectedType<T>::value>
class TimerIsObjectAliveTrait {
public:
static bool IsHeapObjectAlive(T*) { return true; }
};
template <typename T>
class TimerIsObjectAliveTrait<T, true> {
public:
static bool IsHeapObjectAlive(T* object_pointer) {
return !ThreadHeap::WillObjectBeLazilySwept(object_pointer);
}
};
template <typename TimerFiredClass>
class TaskRunnerTimer : public TimerBase {
public:
using TimerFiredFunction = void (TimerFiredClass::*)(TimerBase*);
TaskRunnerTimer(scoped_refptr<base::SingleThreadTaskRunner> web_task_runner,
TimerFiredClass* o,
TimerFiredFunction f)
: TimerBase(std::move(web_task_runner)), object_(o), function_(f) {}
~TaskRunnerTimer() override = default;
protected:
void Fired() override { (object_->*function_)(this); }
NO_SANITIZE_ADDRESS
bool CanFire() const override {
// Oilpan: if a timer fires while Oilpan heaps are being lazily
// swept, it is not safe to proceed if the object is about to
// be swept (and this timer will be stopped while doing so.)
return TimerIsObjectAliveTrait<TimerFiredClass>::IsHeapObjectAlive(object_);
}
private:
// FIXME: Oilpan: TimerBase should be moved to the heap and m_object should be
// traced. This raw pointer is safe as long as Timer<X> is held by the X
// itself (That's the case
// in the current code base).
GC_PLUGIN_IGNORE("363031")
TimerFiredClass* object_;
TimerFiredFunction function_;
};
NO_SANITIZE_ADDRESS
inline bool TimerBase::IsActive() const {
#if DCHECK_IS_ON()
DCHECK_EQ(thread_, CurrentThread());
#endif
return weak_ptr_factory_.HasWeakPtrs();
}
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_TIMER_H_
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