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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 Timer_h
#define Timer_h
#include "platform/PlatformExport.h"
#include "platform/heap/Handle.h"
#include "public/platform/WebTaskRunner.h"
#include "public/platform/WebTraceLocation.h"
#include "wtf/AddressSanitizer.h"
#include "wtf/Noncopyable.h"
#include "wtf/Threading.h"
#include "wtf/Vector.h"
namespace blink {
// Time intervals are all in seconds.
class PLATFORM_EXPORT TimerBase {
WTF_MAKE_NONCOPYABLE(TimerBase);
public:
TimerBase();
virtual ~TimerBase();
void start(double nextFireInterval, double repeatInterval, const WebTraceLocation&);
void startRepeating(double repeatInterval, const WebTraceLocation& caller)
{
start(repeatInterval, repeatInterval, caller);
}
void startOneShot(double interval, const WebTraceLocation& caller)
{
start(interval, 0, caller);
}
void stop();
bool isActive() const;
const WebTraceLocation& location() const { return m_location; }
double nextFireInterval() const;
double repeatInterval() const { return m_repeatInterval; }
void augmentRepeatInterval(double delta) {
double now = monotonicallyIncreasingTime();
setNextFireTime(now, m_nextFireTime - now + delta);
m_repeatInterval += delta;
}
struct PLATFORM_EXPORT Comparator {
bool operator()(const TimerBase* a, const TimerBase* b) const;
};
private:
virtual void fired() = 0;
virtual WebTaskRunner* timerTaskRunner();
NO_LAZY_SWEEP_SANITIZE_ADDRESS
virtual bool canFire() const { return true; }
virtual double alignedFireTime(double fireTime) const { return fireTime; }
void setNextFireTime(double now, double delay);
void runInternal();
class CancellableTimerTask final : public WebTaskRunner::Task {
WTF_MAKE_NONCOPYABLE(CancellableTimerTask);
public:
explicit CancellableTimerTask(TimerBase* timer) : m_timer(timer) { }
~CancellableTimerTask() override
{
if (m_timer)
m_timer->m_cancellableTimerTask = nullptr;
}
NO_LAZY_SWEEP_SANITIZE_ADDRESS
void run() override
{
if (m_timer) {
m_timer->m_cancellableTimerTask = nullptr;
m_timer->runInternal();
m_timer = nullptr;
}
}
void cancel()
{
m_timer = nullptr;
}
private:
TimerBase* m_timer; // NOT OWNED
};
double m_nextFireTime; // 0 if inactive
double m_repeatInterval; // 0 if not repeating
WebTraceLocation m_location;
CancellableTimerTask* m_cancellableTimerTask; // NOT OWNED
WebScheduler* m_webScheduler; // Not owned.
#if ENABLE(ASSERT)
ThreadIdentifier m_thread;
#endif
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* objectPointer)
{
return !Heap::willObjectBeLazilySwept(objectPointer);
}
};
template <typename TimerFiredClass>
class Timer : public TimerBase {
public:
typedef void (TimerFiredClass::*TimerFiredFunction)(Timer*);
Timer(TimerFiredClass* o, TimerFiredFunction f)
: m_object(o), m_function(f)
{
}
protected:
void fired() override
{
(m_object->*m_function)(this);
}
NO_LAZY_SWEEP_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(m_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* m_object;
TimerFiredFunction m_function;
};
NO_LAZY_SWEEP_SANITIZE_ADDRESS
inline bool TimerBase::isActive() const
{
ASSERT(m_thread == currentThread());
return m_cancellableTimerTask;
}
} // namespace blink
#endif // Timer_h
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