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83 lines
3.0 KiB
C
83 lines
3.0 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_THREAD_CONTROLLER_H_
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#define BASE_TASK_SEQUENCE_MANAGER_THREAD_CONTROLLER_H_
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#include "base/run_loop.h"
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#include "base/single_thread_task_runner.h"
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#include "base/task/sequence_manager/lazy_now.h"
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#include "base/time/time.h"
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namespace base {
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class TickClock;
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struct PendingTask;
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namespace sequence_manager {
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namespace internal {
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class SequencedTaskSource;
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// Implementation of this interface is used by TaskQueueManager to schedule
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// actual work to be run. Hopefully we can stop using MessageLoop and this
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// interface will become more concise.
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class ThreadController {
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public:
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virtual ~ThreadController() = default;
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// Sets the number of tasks executed in a single invocation of DoWork.
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// Increasing the batch size can reduce the overhead of yielding back to the
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// main message loop.
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virtual void SetWorkBatchSize(int work_batch_size = 1) = 0;
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// Notifies that |pending_task| was enqueued. Needed for tracing purposes.
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virtual void DidQueueTask(const PendingTask& pending_task) = 0;
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// Notify the controller that its associated sequence has immediate work
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// to run. Shortly after this is called, the thread associated with this
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// controller will run a task returned by sequence->TakeTask(). Can be called
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// from any sequence.
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//
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// TODO(altimin): Change this to "the thread associated with this
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// controller will run tasks returned by sequence->TakeTask() until it
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// returns null or sequence->DidRunTask() returns false" once the
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// code is changed to work that way.
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virtual void ScheduleWork() = 0;
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// Notify the controller that SequencedTaskSource will have a delayed work
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// ready to be run at |run_time|. This call cancels any previously
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// scheduled delayed work. Can only be called from the main sequence.
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// NOTE: DelayTillNextTask might return a different value as it also takes
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// immediate work into account.
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virtual void SetNextDelayedDoWork(LazyNow* lazy_now, TimeTicks run_time) = 0;
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// Sets the sequenced task source from which to take tasks after
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// a Schedule*Work() call is made.
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// Must be called before the first call to Schedule*Work().
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virtual void SetSequencedTaskSource(SequencedTaskSource*) = 0;
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// TODO(altimin): Get rid of the methods below.
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// These methods exist due to current integration of TaskQueueManager
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// with MessageLoop.
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virtual bool RunsTasksInCurrentSequence() = 0;
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virtual const TickClock* GetClock() = 0;
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virtual void SetDefaultTaskRunner(scoped_refptr<SingleThreadTaskRunner>) = 0;
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virtual void RestoreDefaultTaskRunner() = 0;
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virtual void AddNestingObserver(RunLoop::NestingObserver* observer) = 0;
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virtual void RemoveNestingObserver(RunLoop::NestingObserver* observer) = 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_THREAD_CONTROLLER_H_
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