| // Copyright 2018 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BASE_TASK_SEQUENCE_MANAGER_THREAD_CONTROLLER_WITH_MESSAGE_PUMP_IMPL_H_ |
| #define BASE_TASK_SEQUENCE_MANAGER_THREAD_CONTROLLER_WITH_MESSAGE_PUMP_IMPL_H_ |
| |
| #include <memory> |
| |
| #include "base/debug/task_annotator.h" |
| #include "base/message_loop/message_pump.h" |
| #include "base/task/sequence_manager/associated_thread_id.h" |
| #include "base/task/sequence_manager/sequenced_task_source.h" |
| #include "base/task/sequence_manager/thread_controller.h" |
| #include "base/threading/platform_thread.h" |
| #include "base/threading/sequence_local_storage_map.h" |
| #include "base/threading/thread_task_runner_handle.h" |
| |
| namespace base { |
| namespace sequence_manager { |
| namespace internal { |
| |
| // EXPERIMENTAL ThreadController implementation which doesn't use |
| // MessageLoop or a task runner to schedule their DoWork calls. |
| // See https://crbug.com/828835. |
| class BASE_EXPORT ThreadControllerWithMessagePumpImpl |
| : public ThreadController, |
| public MessagePump::Delegate, |
| public RunLoop::Delegate { |
| public: |
| ThreadControllerWithMessagePumpImpl(std::unique_ptr<MessagePump> message_pump, |
| const TickClock* time_source); |
| ~ThreadControllerWithMessagePumpImpl() override; |
| |
| // ThreadController implementation: |
| void SetSequencedTaskSource(SequencedTaskSource* task_source) override; |
| void SetMessageLoop(MessageLoop* message_loop) override; |
| void SetWorkBatchSize(int work_batch_size) override; |
| void WillQueueTask(PendingTask* pending_task) override; |
| void ScheduleWork() override; |
| void SetNextDelayedDoWork(LazyNow* lazy_now, TimeTicks run_time) override; |
| void SetTimerSlack(TimerSlack timer_slack) override; |
| const TickClock* GetClock() override; |
| bool RunsTasksInCurrentSequence() override; |
| void SetDefaultTaskRunner( |
| scoped_refptr<SingleThreadTaskRunner> task_runner) override; |
| void RestoreDefaultTaskRunner() override; |
| void AddNestingObserver(RunLoop::NestingObserver* observer) override; |
| void RemoveNestingObserver(RunLoop::NestingObserver* observer) override; |
| const scoped_refptr<AssociatedThreadId>& GetAssociatedThread() const override; |
| |
| private: |
| friend class DoWorkScope; |
| friend class RunScope; |
| |
| // MessagePump::Delegate implementation. |
| bool DoWork() override; |
| bool DoDelayedWork(TimeTicks* next_run_time) override; |
| bool DoIdleWork() override; |
| |
| // RunLoop::Delegate implementation. |
| void Run(bool application_tasks_allowed) override; |
| void Quit() override; |
| void EnsureWorkScheduled() override; |
| |
| struct MainThreadOnly { |
| MainThreadOnly(); |
| ~MainThreadOnly(); |
| |
| SequencedTaskSource* task_source = nullptr; // Not owned. |
| RunLoop::NestingObserver* nesting_observer = nullptr; // Not owned. |
| std::unique_ptr<ThreadTaskRunnerHandle> thread_task_runner_handle; |
| |
| // Indicates that we should yield DoWork ASAP. |
| bool quit_do_work = false; |
| |
| // Number of tasks processed in a single DoWork invocation. |
| int batch_size = 1; |
| |
| // Number of RunLoop layers currently running. |
| int run_depth = 0; |
| |
| // Number of DoWork running, but only the inner-most one can take tasks. |
| // Must be equal to |run_depth| or |run_depth - 1|. |
| int do_work_depth = 0; |
| }; |
| |
| MainThreadOnly& main_thread_only() { |
| DCHECK_CALLED_ON_VALID_THREAD(associated_thread_->thread_checker); |
| return main_thread_only_; |
| } |
| |
| // Returns true if there's a DoWork running on the inner-most nesting layer. |
| bool is_doing_work() const { |
| DCHECK_CALLED_ON_VALID_THREAD(associated_thread_->thread_checker); |
| return main_thread_only_.do_work_depth == main_thread_only_.run_depth && |
| main_thread_only_.do_work_depth != 0; |
| } |
| |
| scoped_refptr<AssociatedThreadId> associated_thread_; |
| MainThreadOnly main_thread_only_; |
| std::unique_ptr<MessagePump> pump_; |
| debug::TaskAnnotator task_annotator_; |
| const TickClock* time_source_; // Not owned. |
| |
| // Required to register the current thread as a sequence. |
| base::internal::SequenceLocalStorageMap sequence_local_storage_map_; |
| std::unique_ptr< |
| base::internal::ScopedSetSequenceLocalStorageMapForCurrentThread> |
| scoped_set_sequence_local_storage_map_for_current_thread_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ThreadControllerWithMessagePumpImpl); |
| }; |
| |
| } // namespace internal |
| } // namespace sequence_manager |
| } // namespace base |
| |
| #endif // BASE_TASK_SEQUENCE_MANAGER_THREAD_CONTROLLER_WITH_MESSAGE_PUMP_IMPL_H_ |