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130 lines
4.6 KiB
C++
130 lines
4.6 KiB
C++
// Copyright 2016 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_SCHEDULER_TASK_SCHEDULER_IMPL_H_
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#define BASE_TASK_SCHEDULER_TASK_SCHEDULER_IMPL_H_
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#include <memory>
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#include <vector>
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#include "base/base_export.h"
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#include "base/callback.h"
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#include "base/logging.h"
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#include "base/macros.h"
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#include "base/memory/ptr_util.h"
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#include "base/memory/ref_counted.h"
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#include "base/strings/string_piece.h"
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#include "base/synchronization/atomic_flag.h"
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#include "base/task_scheduler/delayed_task_manager.h"
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#include "base/task_scheduler/scheduler_single_thread_task_runner_manager.h"
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#include "base/task_scheduler/scheduler_worker_pool_impl.h"
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#include "base/task_scheduler/single_thread_task_runner_thread_mode.h"
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#include "base/task_scheduler/task_scheduler.h"
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#include "base/task_scheduler/task_tracker.h"
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#include "base/task_scheduler/task_traits.h"
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#include "base/threading/thread.h"
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#include "build/build_config.h"
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#if defined(OS_POSIX) && !defined(OS_NACL_SFI)
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#include "base/task_scheduler/task_tracker_posix.h"
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#endif
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#if defined(OS_WIN)
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#include "base/win/com_init_check_hook.h"
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#endif
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namespace base {
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class HistogramBase;
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namespace internal {
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// Default TaskScheduler implementation. This class is thread-safe.
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class BASE_EXPORT TaskSchedulerImpl : public TaskScheduler {
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public:
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using TaskTrackerImpl =
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#if defined(OS_POSIX) && !defined(OS_NACL_SFI)
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TaskTrackerPosix;
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#else
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TaskTracker;
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#endif
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// |name| is used to label threads and histograms. |task_tracker| can be used
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// for tests that need more execution control. By default, the production
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// TaskTracker is used.
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explicit TaskSchedulerImpl(StringPiece name,
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std::unique_ptr<TaskTrackerImpl> task_tracker =
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std::make_unique<TaskTrackerImpl>());
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~TaskSchedulerImpl() override;
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// TaskScheduler:
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void Start(const TaskScheduler::InitParams& init_params) override;
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void PostDelayedTaskWithTraits(const Location& from_here,
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const TaskTraits& traits,
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OnceClosure task,
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TimeDelta delay) override;
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scoped_refptr<TaskRunner> CreateTaskRunnerWithTraits(
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const TaskTraits& traits) override;
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scoped_refptr<SequencedTaskRunner> CreateSequencedTaskRunnerWithTraits(
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const TaskTraits& traits) override;
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scoped_refptr<SingleThreadTaskRunner> CreateSingleThreadTaskRunnerWithTraits(
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const TaskTraits& traits,
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SingleThreadTaskRunnerThreadMode thread_mode) override;
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#if defined(OS_WIN)
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scoped_refptr<SingleThreadTaskRunner> CreateCOMSTATaskRunnerWithTraits(
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const TaskTraits& traits,
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SingleThreadTaskRunnerThreadMode thread_mode) override;
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#endif // defined(OS_WIN)
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std::vector<const HistogramBase*> GetHistograms() const override;
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int GetMaxConcurrentNonBlockedTasksWithTraitsDeprecated(
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const TaskTraits& traits) const override;
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void Shutdown() override;
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void FlushForTesting() override;
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void JoinForTesting() override;
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private:
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// Returns the worker pool that runs Tasks with |traits|.
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SchedulerWorkerPoolImpl* GetWorkerPoolForTraits(
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const TaskTraits& traits) const;
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// Returns |traits|, with priority set to TaskPriority::USER_BLOCKING if
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// |all_tasks_user_blocking_| is set.
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TaskTraits SetUserBlockingPriorityIfNeeded(const TaskTraits& traits) const;
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const std::string name_;
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Thread service_thread_;
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const std::unique_ptr<TaskTrackerImpl> task_tracker_;
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DelayedTaskManager delayed_task_manager_;
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SchedulerSingleThreadTaskRunnerManager single_thread_task_runner_manager_;
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// Indicates that all tasks are handled as if they had been posted with
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// TaskPriority::USER_BLOCKING. Since this is set in Start(), it doesn't apply
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// to tasks posted before Start() or to tasks posted to TaskRunners created
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// before Start().
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//
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// TODO(fdoray): Remove after experiment. https://crbug.com/757022
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AtomicFlag all_tasks_user_blocking_;
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// There are 4 SchedulerWorkerPoolImpl in this array to match the 4
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// SchedulerWorkerPoolParams in TaskScheduler::InitParams.
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std::unique_ptr<SchedulerWorkerPoolImpl> worker_pools_[4];
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#if DCHECK_IS_ON()
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// Set once JoinForTesting() has returned.
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AtomicFlag join_for_testing_returned_;
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#endif
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#if defined(OS_WIN) && defined(COM_INIT_CHECK_HOOK_ENABLED)
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// Provides COM initialization verification for supported builds.
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base::win::ComInitCheckHook com_init_check_hook_;
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#endif
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DISALLOW_COPY_AND_ASSIGN(TaskSchedulerImpl);
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};
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} // namespace internal
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} // namespace base
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#endif // BASE_TASK_SCHEDULER_TASK_SCHEDULER_IMPL_H_
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