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/*
* Copyright (C) 2006, 2008 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 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.
*/
#include "third_party/blink/renderer/platform/timer.h"
#include <algorithm>
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/renderer/platform/instrumentation/tracing/trace_event.h"
#include "third_party/blink/renderer/platform/scheduler/public/thread_scheduler.h"
#include "third_party/blink/renderer/platform/wtf/address_sanitizer.h"
#include "third_party/blink/renderer/platform/wtf/time.h"
namespace blink {
TimerBase::TimerBase(
scoped_refptr<base::SingleThreadTaskRunner> web_task_runner)
: web_task_runner_(std::move(web_task_runner)),
#if DCHECK_IS_ON()
thread_(CurrentThread()),
#endif
weak_ptr_factory_(this) {
}
TimerBase::~TimerBase() {
Stop();
}
void TimerBase::Start(TimeDelta next_fire_interval,
TimeDelta repeat_interval,
const base::Location& caller) {
#if DCHECK_IS_ON()
DCHECK_EQ(thread_, CurrentThread());
#endif
location_ = caller;
repeat_interval_ = repeat_interval;
SetNextFireTime(TimerCurrentTimeTicks(), next_fire_interval);
}
void TimerBase::Stop() {
#if DCHECK_IS_ON()
DCHECK_EQ(thread_, CurrentThread());
#endif
repeat_interval_ = TimeDelta();
next_fire_time_ = TimeTicks();
weak_ptr_factory_.InvalidateWeakPtrs();
}
TimeDelta TimerBase::NextFireInterval() const {
DCHECK(IsActive());
TimeTicks current = TimerCurrentTimeTicks();
if (next_fire_time_ < current)
return TimeDelta();
return next_fire_time_ - current;
}
void TimerBase::MoveToNewTaskRunner(
scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
#if DCHECK_IS_ON()
DCHECK_EQ(thread_, CurrentThread());
DCHECK(task_runner->RunsTasksInCurrentSequence());
#endif
// If the underlying task runner stays the same, ignore it.
if (web_task_runner_ == task_runner) {
return;
}
bool active = IsActive();
weak_ptr_factory_.InvalidateWeakPtrs();
web_task_runner_ = std::move(task_runner);
if (!active)
return;
TimeTicks now = TimerCurrentTimeTicks();
TimeTicks next_fire_time = std::max(next_fire_time_, now);
next_fire_time_ = TimeTicks();
SetNextFireTime(now, next_fire_time - now);
}
scoped_refptr<base::SingleThreadTaskRunner> TimerBase::TimerTaskRunner() const {
return web_task_runner_;
}
void TimerBase::SetNextFireTime(TimeTicks now, TimeDelta delay) {
#if DCHECK_IS_ON()
DCHECK_EQ(thread_, CurrentThread());
#endif
TimeTicks new_time = now + delay;
if (next_fire_time_ != new_time) {
next_fire_time_ = new_time;
// Cancel any previously posted task.
weak_ptr_factory_.InvalidateWeakPtrs();
TimerTaskRunner()->PostDelayedTask(
location_,
WTF::Bind(&TimerBase::RunInternal, weak_ptr_factory_.GetWeakPtr()),
delay);
}
}
NO_SANITIZE_ADDRESS
void TimerBase::RunInternal() {
if (!CanFire())
return;
weak_ptr_factory_.InvalidateWeakPtrs();
TRACE_EVENT0("blink", "TimerBase::run");
#if DCHECK_IS_ON()
DCHECK_EQ(thread_, CurrentThread())
<< "Timer posted by " << location_.function_name() << " "
<< location_.file_name() << " was run on a different thread";
#endif
if (!repeat_interval_.is_zero()) {
TimeTicks now = TimerCurrentTimeTicks();
// This computation should be drift free, and it will cope if we miss a
// beat, which can easily happen if the thread is busy. It will also cope
// if we get called slightly before m_unalignedNextFireTime, which can
// happen due to lack of timer precision.
TimeDelta interval_to_next_fire_time =
repeat_interval_ - (now - next_fire_time_) % repeat_interval_;
SetNextFireTime(now, interval_to_next_fire_time);
} else {
next_fire_time_ = TimeTicks();
}
Fired();
}
bool TimerBase::Comparator::operator()(const TimerBase* a,
const TimerBase* b) const {
return a->next_fire_time_ < b->next_fire_time_;
}
// static
TimeTicks TimerBase::TimerCurrentTimeTicks() const {
return WTF::TimeTicks(Platform::Current()
->CurrentThread()
->Scheduler()
->MonotonicallyIncreasingVirtualTime());
}
} // namespace blink
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