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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CONTENT_RENDERER_SCHEDULER_TASK_QUEUE_MANAGER_H_ | 5 #ifndef CONTENT_RENDERER_SCHEDULER_TASK_QUEUE_MANAGER_H_ |
6 #define CONTENT_RENDERER_SCHEDULER_TASK_QUEUE_MANAGER_H_ | 6 #define CONTENT_RENDERER_SCHEDULER_TASK_QUEUE_MANAGER_H_ |
7 | 7 |
8 #include "base/atomic_sequence_num.h" | 8 #include "base/atomic_sequence_num.h" |
9 #include "base/debug/task_annotator.h" | 9 #include "base/debug/task_annotator.h" |
10 #include "base/macros.h" | 10 #include "base/macros.h" |
11 #include "base/memory/weak_ptr.h" | 11 #include "base/memory/weak_ptr.h" |
12 #include "base/message_loop/message_loop.h" | 12 #include "base/message_loop/message_loop.h" |
13 #include "base/pending_task.h" | 13 #include "base/pending_task.h" |
14 #include "base/single_thread_task_runner.h" | 14 #include "base/single_thread_task_runner.h" |
15 #include "base/synchronization/lock.h" | 15 #include "base/synchronization/lock.h" |
16 #include "base/threading/thread_checker.h" | 16 #include "base/threading/thread_checker.h" |
17 #include "content/child/scheduler/task_queue_selector.h" | 17 #include "content/child/scheduler/task_queue_selector.h" |
| 18 #include "content/child/scheduler/time_source.h" |
18 #include "content/common/content_export.h" | 19 #include "content/common/content_export.h" |
19 | 20 |
20 namespace base { | 21 namespace base { |
21 namespace trace_event { | 22 namespace trace_event { |
22 class ConvertableToTraceFormat; | 23 class ConvertableToTraceFormat; |
23 class TracedValue; | 24 class TracedValue; |
24 } | 25 } |
25 } | 26 } |
26 | 27 |
27 namespace cc { | |
28 class TestNowSource; | |
29 } | |
30 | |
31 namespace content { | 28 namespace content { |
32 namespace internal { | 29 namespace internal { |
33 class LazyNow; | 30 class LazyNow; |
34 class TaskQueue; | 31 class TaskQueue; |
35 } | 32 } |
| 33 class NestableSingleThreadTaskRunner; |
36 class TaskQueueSelector; | 34 class TaskQueueSelector; |
37 class NestableSingleThreadTaskRunner; | 35 class TimeSource; |
38 | 36 |
39 // The task queue manager provides N task queues and a selector interface for | 37 // The task queue manager provides N task queues and a selector interface for |
40 // choosing which task queue to service next. Each task queue consists of two | 38 // choosing which task queue to service next. Each task queue consists of two |
41 // sub queues: | 39 // sub queues: |
42 // | 40 // |
43 // 1. Incoming task queue. Tasks that are posted get immediately appended here. | 41 // 1. Incoming task queue. Tasks that are posted get immediately appended here. |
44 // When a task is appended into an empty incoming queue, the task manager | 42 // When a task is appended into an empty incoming queue, the task manager |
45 // work function (DoWork) is scheduled to run on the main task runner. | 43 // work function (DoWork) is scheduled to run on the main task runner. |
46 // | 44 // |
47 // 2. Work queue. If a work queue is empty when DoWork() is entered, tasks from | 45 // 2. Work queue. If a work queue is empty when DoWork() is entered, tasks from |
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117 // manager. Increasing the batch size can reduce the overhead of yielding | 115 // manager. Increasing the batch size can reduce the overhead of yielding |
118 // back to the main message loop -- at the cost of potentially delaying other | 116 // back to the main message loop -- at the cost of potentially delaying other |
119 // tasks posted to the main loop. The batch size is 1 by default. | 117 // tasks posted to the main loop. The batch size is 1 by default. |
120 void SetWorkBatchSize(int work_batch_size); | 118 void SetWorkBatchSize(int work_batch_size); |
121 | 119 |
122 // These functions can only be called on the same thread that the task queue | 120 // These functions can only be called on the same thread that the task queue |
123 // manager executes its tasks on. | 121 // manager executes its tasks on. |
124 void AddTaskObserver(base::MessageLoop::TaskObserver* task_observer); | 122 void AddTaskObserver(base::MessageLoop::TaskObserver* task_observer); |
125 void RemoveTaskObserver(base::MessageLoop::TaskObserver* task_observer); | 123 void RemoveTaskObserver(base::MessageLoop::TaskObserver* task_observer); |
126 | 124 |
127 void SetTimeSourceForTesting(scoped_refptr<cc::TestNowSource> time_source); | 125 void SetTimeSourceForTesting(scoped_ptr<TimeSource> time_source); |
128 | 126 |
129 // Returns a bitmap where a bit is set iff a task on the corresponding queue | 127 // Returns a bitmap where a bit is set iff a task on the corresponding queue |
130 // was run since the last call to GetAndClearTaskWasRunOnQueueBitmap. | 128 // was run since the last call to GetAndClearTaskWasRunOnQueueBitmap. |
131 uint64 GetAndClearTaskWasRunOnQueueBitmap(); | 129 uint64 GetAndClearTaskWasRunOnQueueBitmap(); |
132 | 130 |
133 private: | 131 private: |
134 // TaskQueueSelector::Observer implementation: | 132 // TaskQueueSelector::Observer implementation: |
135 void OnTaskQueueEnabled() override; | 133 void OnTaskQueueEnabled() override; |
136 | 134 |
137 friend class internal::LazyNow; | 135 friend class internal::LazyNow; |
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204 base::Closure do_work_from_other_thread_closure_; | 202 base::Closure do_work_from_other_thread_closure_; |
205 | 203 |
206 uint64 task_was_run_bitmap_; | 204 uint64 task_was_run_bitmap_; |
207 | 205 |
208 // The pending_dowork_count_ is only tracked on the main thread since that's | 206 // The pending_dowork_count_ is only tracked on the main thread since that's |
209 // where re-entrant problems happen. | 207 // where re-entrant problems happen. |
210 int pending_dowork_count_; | 208 int pending_dowork_count_; |
211 | 209 |
212 int work_batch_size_; | 210 int work_batch_size_; |
213 | 211 |
214 scoped_refptr<cc::TestNowSource> time_source_; | 212 scoped_ptr<TimeSource> time_source_; |
215 | 213 |
216 ObserverList<base::MessageLoop::TaskObserver> task_observers_; | 214 ObserverList<base::MessageLoop::TaskObserver> task_observers_; |
217 | 215 |
218 const char* disabled_by_default_tracing_category_; | 216 const char* disabled_by_default_tracing_category_; |
219 | 217 |
220 scoped_refptr<DeletionSentinel> deletion_sentinel_; | 218 scoped_refptr<DeletionSentinel> deletion_sentinel_; |
221 base::WeakPtrFactory<TaskQueueManager> weak_factory_; | 219 base::WeakPtrFactory<TaskQueueManager> weak_factory_; |
222 | 220 |
223 DISALLOW_COPY_AND_ASSIGN(TaskQueueManager); | 221 DISALLOW_COPY_AND_ASSIGN(TaskQueueManager); |
224 }; | 222 }; |
225 | 223 |
226 } // namespace content | 224 } // namespace content |
227 | 225 |
228 #endif // CONTENT_RENDERER_SCHEDULER_TASK_QUEUE_MANAGER_H_ | 226 #endif // CONTENT_RENDERER_SCHEDULER_TASK_QUEUE_MANAGER_H_ |
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