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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.
#ifndef BASE_MEMORY_POST_DELAYED_MEMORY_REDUCTION_TASK_H_
#define BASE_MEMORY_POST_DELAYED_MEMORY_REDUCTION_TASK_H_
#include "base/task/sequenced_task_runner.h"
namespace base {
// Context in which a memory reduction task is invoked.
enum class MemoryReductionTaskContext {
// After the expiration of its delay.
kDelayExpired,
// Before the expiration of its delay, to proactively reduce memory.
kProactive,
};
// This API should be used for posting delayed tasks that reduce memory usage
// while Chrome is backgrounded. On Android 14+, tasks posted this way may be
// run before the delay is elapsed, in the case where Chrome is about to be
// frozen by Android. On other platforms, this is equivalent to directly posting
// the delayed task, using the task runner.
void BASE_EXPORT
PostDelayedMemoryReductionTask(scoped_refptr<SequencedTaskRunner> task_runner,
const Location& from_here,
OnceClosure task,
base::TimeDelta delay);
// Same as above, but passes a parameter to the task, depending on how it was
// run. On non-Android platforms, will always pass |kDelayExpired|.
void BASE_EXPORT PostDelayedMemoryReductionTask(
scoped_refptr<SequencedTaskRunner> task_runner,
const Location& from_here,
OnceCallback<void(MemoryReductionTaskContext)> task,
base::TimeDelta delay);
// Replacement for |OneShotTimer|, that allows the tasks to be run by
// |OnPreFreeze| (see |PreFreezeBackgroundMemoryTrimmer| above).
class BASE_EXPORT OneShotDelayedBackgroundTimer final {
public:
OneShotDelayedBackgroundTimer();
~OneShotDelayedBackgroundTimer();
void Stop();
void Start(const Location& posted_from, TimeDelta delay, OnceClosure task) {
Start(posted_from, delay,
BindOnce(
[](OnceClosure task,
MemoryReductionTaskContext called_from_prefreeze) {
std::move(task).Run();
},
std::move(task)));
}
void Start(const Location& posted_from,
TimeDelta delay,
OnceCallback<void(MemoryReductionTaskContext)> task);
bool IsRunning() const;
template <class Receiver>
void Start(const Location& posted_from,
TimeDelta delay,
Receiver* receiver,
void (Receiver::*method)()) {
Start(posted_from, delay, BindOnce(method, Unretained(receiver)));
}
void SetTaskRunner(scoped_refptr<SequencedTaskRunner> task_runner);
private:
class OneShotDelayedBackgroundTimerImpl {
public:
virtual ~OneShotDelayedBackgroundTimerImpl() = default;
virtual void Stop() = 0;
virtual void Start(const Location& posted_from,
TimeDelta delay,
OnceCallback<void(MemoryReductionTaskContext)> task) = 0;
virtual bool IsRunning() const = 0;
virtual void SetTaskRunner(
scoped_refptr<SequencedTaskRunner> task_runner) = 0;
};
#if BUILDFLAG(IS_ANDROID)
friend class android::PreFreezeBackgroundMemoryTrimmer;
#endif
class TimerImpl;
class TaskImpl;
std::unique_ptr<OneShotDelayedBackgroundTimerImpl> impl_;
};
} // namespace base
#endif // BASE_MEMORY_POST_DELAYED_MEMORY_REDUCTION_TASK_H_
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