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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/memory/post_delayed_memory_reduction_task.h"
#include "base/timer/timer.h"
#if BUILDFLAG(IS_ANDROID)
#include "base/android/pre_freeze_background_memory_trimmer.h"
#endif
namespace base {
void PostDelayedMemoryReductionTask(
scoped_refptr<SequencedTaskRunner> task_runner,
const Location& from_here,
OnceClosure task,
base::TimeDelta delay) {
#if BUILDFLAG(IS_ANDROID)
android::PreFreezeBackgroundMemoryTrimmer::PostDelayedBackgroundTask(
std::move(task_runner), from_here, std::move(task), delay);
#else
task_runner->PostDelayedTask(from_here, std::move(task), delay);
#endif
}
void PostDelayedMemoryReductionTask(
scoped_refptr<SequencedTaskRunner> task_runner,
const Location& from_here,
OnceCallback<void(MemoryReductionTaskContext)> task,
base::TimeDelta delay) {
#if BUILDFLAG(IS_ANDROID)
android::PreFreezeBackgroundMemoryTrimmer::PostDelayedBackgroundTask(
std::move(task_runner), from_here, std::move(task), delay);
#else
task_runner->PostDelayedTask(
from_here,
BindOnce(std::move(task), MemoryReductionTaskContext::kDelayExpired),
delay);
#endif // BUILDFLAG(IS_ANDROID)
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* *
* OneShotDelayedBackgroundTimer::TimerImpl *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
// This implementation is just a small wrapper around a |base::OneShotTimer|.
class OneShotDelayedBackgroundTimer::TimerImpl final
: public OneShotDelayedBackgroundTimer::OneShotDelayedBackgroundTimerImpl {
public:
~TimerImpl() override = default;
void Start(const Location& from_here,
TimeDelta delay,
OnceCallback<void(MemoryReductionTaskContext)> task) override {
timer_.Start(
from_here, delay,
BindOnce(std::move(task), MemoryReductionTaskContext::kDelayExpired));
}
void Stop() override { timer_.Stop(); }
bool IsRunning() const override { return timer_.IsRunning(); }
void SetTaskRunner(scoped_refptr<SequencedTaskRunner> task_runner) override {
timer_.SetTaskRunner(std::move(task_runner));
}
private:
OneShotTimer timer_;
};
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* *
* TaskImpl *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#if BUILDFLAG(IS_ANDROID)
class OneShotDelayedBackgroundTimer::TaskImpl final
: public OneShotDelayedBackgroundTimer::OneShotDelayedBackgroundTimerImpl {
public:
~TaskImpl() override = default;
void Start(const Location& from_here,
TimeDelta delay,
OnceCallback<void(MemoryReductionTaskContext)> task) override {
this->StartInternal(
from_here, delay,
BindOnce(
[](TaskImpl* timer,
OnceCallback<void(MemoryReductionTaskContext)> task,
MemoryReductionTaskContext in_pre_freeze) {
std::move(task).Run(in_pre_freeze);
timer->task_ = nullptr;
},
// |base::Unretained(this)| is safe here because destroying this
// will cancel the task. We do not need to worry about race
// conditions here because destruction should always happen on the
// same thread that the task is started on.
base::Unretained(this), std::move(task)));
}
void StartInternal(const Location& from_here,
TimeDelta delay,
OnceCallback<void(MemoryReductionTaskContext)> task) {
if (IsRunning()) {
Stop();
}
DCHECK(GetTaskRunner()->RunsTasksInCurrentSequence());
base::AutoLock locker(android::PreFreezeBackgroundMemoryTrimmer::lock());
task_ = android::PreFreezeBackgroundMemoryTrimmer::Instance()
.PostDelayedBackgroundTaskModernHelper(
GetTaskRunner(), from_here, std::move(task), delay);
}
void Stop() override {
if (IsRunning()) {
task_.ExtractAsDangling()->CancelTask();
}
}
bool IsRunning() const override { return task_ != nullptr; }
void SetTaskRunner(scoped_refptr<SequencedTaskRunner> task_runner) override {
task_runner_ = task_runner;
}
private:
scoped_refptr<SequencedTaskRunner> GetTaskRunner() {
// This matches the semantics of |OneShotTimer::GetTaskRunner()|.
return task_runner_ ? task_runner_
: SequencedTaskRunner::GetCurrentDefault();
}
raw_ptr<android::PreFreezeBackgroundMemoryTrimmer::BackgroundTask> task_ =
nullptr;
scoped_refptr<SequencedTaskRunner> task_runner_ = nullptr;
};
#endif
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* *
* OneShotDelayedBackgroundTimer *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
OneShotDelayedBackgroundTimer::OneShotDelayedBackgroundTimer() {
#if BUILDFLAG(IS_ANDROID)
if (android::PreFreezeBackgroundMemoryTrimmer::ShouldUseModernTrim()) {
impl_ = std::make_unique<TaskImpl>();
} else {
impl_ = std::make_unique<TimerImpl>();
}
#else
impl_ = std::make_unique<TimerImpl>();
#endif
}
OneShotDelayedBackgroundTimer::~OneShotDelayedBackgroundTimer() {
Stop();
}
void OneShotDelayedBackgroundTimer::Stop() {
impl_->Stop();
}
bool OneShotDelayedBackgroundTimer::IsRunning() const {
return impl_->IsRunning();
}
void OneShotDelayedBackgroundTimer::SetTaskRunner(
scoped_refptr<SequencedTaskRunner> task_runner) {
impl_->SetTaskRunner(std::move(task_runner));
}
void OneShotDelayedBackgroundTimer::Start(
const Location& from_here,
TimeDelta delay,
OnceCallback<void(MemoryReductionTaskContext)> task) {
#if BUILDFLAG(IS_ANDROID)
android::PreFreezeBackgroundMemoryTrimmer::
RegisterPrivateMemoryFootprintMetric();
#endif
impl_->Start(from_here, delay, std::move(task));
}
} // namespace base
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