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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 #include "components/scheduler/base/task_queue_manager.h" | 5 #include "components/scheduler/base/task_queue_manager.h" |
6 | 6 |
7 #include <queue> | 7 #include <queue> |
8 #include <set> | 8 #include <set> |
9 | 9 |
10 #include "base/bind.h" | 10 #include "base/bind.h" |
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41 : real_time_domain_(new RealTimeDomain()), | 41 : real_time_domain_(new RealTimeDomain()), |
42 delegate_(delegate), | 42 delegate_(delegate), |
43 task_was_run_on_quiescence_monitored_queue_(false), | 43 task_was_run_on_quiescence_monitored_queue_(false), |
44 work_batch_size_(1), | 44 work_batch_size_(1), |
45 task_count_(0), | 45 task_count_(0), |
46 tracing_category_(tracing_category), | 46 tracing_category_(tracing_category), |
47 disabled_by_default_tracing_category_( | 47 disabled_by_default_tracing_category_( |
48 disabled_by_default_tracing_category), | 48 disabled_by_default_tracing_category), |
49 disabled_by_default_verbose_tracing_category_( | 49 disabled_by_default_verbose_tracing_category_( |
50 disabled_by_default_verbose_tracing_category), | 50 disabled_by_default_verbose_tracing_category), |
| 51 currently_executing_task_queue_(nullptr), |
51 observer_(nullptr), | 52 observer_(nullptr), |
52 deletion_sentinel_(new DeletionSentinel()), | 53 deletion_sentinel_(new DeletionSentinel()), |
53 weak_factory_(this) { | 54 weak_factory_(this) { |
54 DCHECK(delegate->RunsTasksOnCurrentThread()); | 55 DCHECK(delegate->RunsTasksOnCurrentThread()); |
55 TRACE_EVENT_OBJECT_CREATED_WITH_ID(disabled_by_default_tracing_category, | 56 TRACE_EVENT_OBJECT_CREATED_WITH_ID(disabled_by_default_tracing_category, |
56 "TaskQueueManager", this); | 57 "TaskQueueManager", this); |
57 selector_.SetTaskQueueSelectorObserver(this); | 58 selector_.SetTaskQueueSelectorObserver(this); |
58 | 59 |
59 from_main_thread_immediate_do_work_closure_ = | 60 from_main_thread_immediate_do_work_closure_ = |
60 base::Bind(&TaskQueueManager::DoWork, weak_factory_.GetWeakPtr(), | 61 base::Bind(&TaskQueueManager::DoWork, weak_factory_.GetWeakPtr(), |
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211 | 212 |
212 // Only run a single task per batch in nested run loops so that we can | 213 // Only run a single task per batch in nested run loops so that we can |
213 // properly exit the nested loop when someone calls RunLoop::Quit(). | 214 // properly exit the nested loop when someone calls RunLoop::Quit(). |
214 if (delegate_->IsNested()) | 215 if (delegate_->IsNested()) |
215 break; | 216 break; |
216 } | 217 } |
217 | 218 |
218 // TODO(alexclarke): Consider refactoring the above loop to terminate only | 219 // TODO(alexclarke): Consider refactoring the above loop to terminate only |
219 // when there's no more work left to be done, rather than posting a | 220 // when there's no more work left to be done, rather than posting a |
220 // continuation task. | 221 // continuation task. |
221 if (!selector_.EnabledWorkQueuesEmpty() || TryAdvanceTimeDomains()) { | 222 if (!selector_.EnabledWorkQueuesEmpty() || TryAdvanceTimeDomains()) |
222 MaybeScheduleImmediateWork(FROM_HERE); | 223 MaybeScheduleImmediateWork(FROM_HERE); |
223 } else { | |
224 // Tell the task runner we have no more work. | |
225 delegate_->OnNoMoreImmediateWork(); | |
226 } | |
227 } | 224 } |
228 | 225 |
229 bool TaskQueueManager::TryAdvanceTimeDomains() { | 226 bool TaskQueueManager::TryAdvanceTimeDomains() { |
230 bool can_advance = false; | 227 bool can_advance = false; |
231 for (TimeDomain* time_domain : time_domains_) { | 228 for (TimeDomain* time_domain : time_domains_) { |
232 can_advance |= time_domain->MaybeAdvanceTime(); | 229 can_advance |= time_domain->MaybeAdvanceTime(); |
233 } | 230 } |
234 return can_advance; | 231 return can_advance; |
235 } | 232 } |
236 | 233 |
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273 | 270 |
274 TRACE_TASK_EXECUTION("TaskQueueManager::ProcessTaskFromWorkQueue", | 271 TRACE_TASK_EXECUTION("TaskQueueManager::ProcessTaskFromWorkQueue", |
275 pending_task); | 272 pending_task); |
276 if (queue->GetShouldNotifyObservers()) { | 273 if (queue->GetShouldNotifyObservers()) { |
277 FOR_EACH_OBSERVER(base::MessageLoop::TaskObserver, task_observers_, | 274 FOR_EACH_OBSERVER(base::MessageLoop::TaskObserver, task_observers_, |
278 WillProcessTask(pending_task)); | 275 WillProcessTask(pending_task)); |
279 queue->NotifyWillProcessTask(pending_task); | 276 queue->NotifyWillProcessTask(pending_task); |
280 } | 277 } |
281 TRACE_EVENT1(tracing_category_, | 278 TRACE_EVENT1(tracing_category_, |
282 "TaskQueueManager::RunTask", "queue", queue->GetName()); | 279 "TaskQueueManager::RunTask", "queue", queue->GetName()); |
| 280 // NOTE when TaskQueues get unregistered a reference ends up getting retained |
| 281 // by |queues_to_delete_| which is cleared at the top of |DoWork|. This means |
| 282 // we are OK to use raw pointers here. |
| 283 internal::TaskQueueImpl* prev_executing_task_queue = |
| 284 currently_executing_task_queue_; |
| 285 currently_executing_task_queue_ = queue; |
283 task_annotator_.RunTask("TaskQueueManager::PostTask", pending_task); | 286 task_annotator_.RunTask("TaskQueueManager::PostTask", pending_task); |
284 | 287 |
285 // Detect if the TaskQueueManager just got deleted. If this happens we must | 288 // Detect if the TaskQueueManager just got deleted. If this happens we must |
286 // not access any member variables after this point. | 289 // not access any member variables after this point. |
287 if (protect->HasOneRef()) | 290 if (protect->HasOneRef()) |
288 return ProcessTaskResult::TASK_QUEUE_MANAGER_DELETED; | 291 return ProcessTaskResult::TASK_QUEUE_MANAGER_DELETED; |
289 | 292 |
| 293 currently_executing_task_queue_ = prev_executing_task_queue; |
| 294 |
290 if (queue->GetShouldNotifyObservers()) { | 295 if (queue->GetShouldNotifyObservers()) { |
291 FOR_EACH_OBSERVER(base::MessageLoop::TaskObserver, task_observers_, | 296 FOR_EACH_OBSERVER(base::MessageLoop::TaskObserver, task_observers_, |
292 DidProcessTask(pending_task)); | 297 DidProcessTask(pending_task)); |
293 queue->NotifyDidProcessTask(pending_task); | 298 queue->NotifyDidProcessTask(pending_task); |
294 } | 299 } |
295 | 300 |
296 pending_task.task.Reset(); | 301 pending_task.task.Reset(); |
297 *out_previous_task = pending_task; | 302 *out_previous_task = pending_task; |
298 return ProcessTaskResult::EXECUTED; | 303 return ProcessTaskResult::EXECUTED; |
299 } | 304 } |
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399 internal::WorkQueue* work_queue) { | 404 internal::WorkQueue* work_queue) { |
400 DCHECK(main_thread_checker_.CalledOnValidThread()); | 405 DCHECK(main_thread_checker_.CalledOnValidThread()); |
401 DCHECK(!work_queue->Empty()); | 406 DCHECK(!work_queue->Empty()); |
402 if (observer_) { | 407 if (observer_) { |
403 observer_->OnTriedToExecuteBlockedTask(*work_queue->task_queue(), | 408 observer_->OnTriedToExecuteBlockedTask(*work_queue->task_queue(), |
404 *work_queue->GetFrontTask()); | 409 *work_queue->GetFrontTask()); |
405 } | 410 } |
406 } | 411 } |
407 | 412 |
408 } // namespace scheduler | 413 } // namespace scheduler |
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