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38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
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// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_TASK_SEQUENCE_MANAGER_SEQUENCED_TASK_SOURCE_H_
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#define BASE_TASK_SEQUENCE_MANAGER_SEQUENCED_TASK_SOURCE_H_
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#include "base/optional.h"
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#include "base/pending_task.h"
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#include "base/task/sequence_manager/lazy_now.h"
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namespace base {
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namespace sequence_manager {
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namespace internal {
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// Interface to pass tasks to ThreadController.
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class SequencedTaskSource {
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public:
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// Returns the next task to run from this source or nullopt if
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// there're no more tasks ready to run. If a task is returned,
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// DidRunTask() must be invoked before the next call to TakeTask().
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virtual Optional<PendingTask> TakeTask() = 0;
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// Notifies this source that the task previously obtained
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// from TakeTask() has been completed.
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virtual void DidRunTask() = 0;
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// Returns the delay till the next task or TimeDelta::Max()
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// if there are no tasks left.
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virtual TimeDelta DelayTillNextTask(LazyNow* lazy_now) = 0;
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};
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} // namespace internal
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} // namespace sequence_manager
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} // namespace base
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#endif // BASE_TASK_SEQUENCE_MANAGER_SEQUENCED_TASK_SOURCE_H_
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