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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 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 "base/task_scheduler/scheduler_worker_pool_impl.h" | 5 #include "base/task_scheduler/scheduler_worker_pool_impl.h" |
6 | 6 |
7 #include <stddef.h> | 7 #include <stddef.h> |
8 | 8 |
9 #include <algorithm> | 9 #include <algorithm> |
10 #include <utility> | 10 #include <utility> |
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206 | 206 |
207 // SchedulerWorker::Delegate: | 207 // SchedulerWorker::Delegate: |
208 void OnMainEntry(SchedulerWorker* worker, | 208 void OnMainEntry(SchedulerWorker* worker, |
209 const TimeDelta& detach_duration) override; | 209 const TimeDelta& detach_duration) override; |
210 scoped_refptr<Sequence> GetWork(SchedulerWorker* worker) override; | 210 scoped_refptr<Sequence> GetWork(SchedulerWorker* worker) override; |
211 void ReEnqueueSequence(scoped_refptr<Sequence> sequence) override; | 211 void ReEnqueueSequence(scoped_refptr<Sequence> sequence) override; |
212 TimeDelta GetSleepTimeout() override; | 212 TimeDelta GetSleepTimeout() override; |
213 bool CanDetach(SchedulerWorker* worker) override; | 213 bool CanDetach(SchedulerWorker* worker) override; |
214 | 214 |
215 void RegisterSingleThreadTaskRunner() { | 215 void RegisterSingleThreadTaskRunner() { |
216 subtle::Barrier_AtomicIncrement(&num_single_threaded_runners_, 1); | 216 // No barrier as barriers only affect sequential consistency which is |
| 217 // irrelevant in a single variable use case (they don't force an immediate |
| 218 // flush anymore than atomics do by default). |
| 219 subtle::NoBarrier_AtomicIncrement(&num_single_threaded_runners_, 1); |
217 } | 220 } |
218 | 221 |
219 void UnregisterSingleThreadTaskRunner() { | 222 void UnregisterSingleThreadTaskRunner() { |
220 subtle::Barrier_AtomicIncrement(&num_single_threaded_runners_, -1); | 223 subtle::NoBarrier_AtomicIncrement(&num_single_threaded_runners_, -1); |
221 } | 224 } |
222 | 225 |
223 private: | 226 private: |
224 SchedulerWorkerPoolImpl* outer_; | 227 SchedulerWorkerPoolImpl* outer_; |
225 const ReEnqueueSequenceCallback re_enqueue_sequence_callback_; | 228 const ReEnqueueSequenceCallback re_enqueue_sequence_callback_; |
226 | 229 |
227 // Single-threaded PriorityQueue for the worker. | 230 // Single-threaded PriorityQueue for the worker. |
228 PriorityQueue single_threaded_priority_queue_; | 231 PriorityQueue single_threaded_priority_queue_; |
229 | 232 |
230 // True if the last Sequence returned by GetWork() was extracted from | 233 // True if the last Sequence returned by GetWork() was extracted from |
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533 } | 536 } |
534 | 537 |
535 TimeDelta SchedulerWorkerPoolImpl::SchedulerWorkerDelegateImpl:: | 538 TimeDelta SchedulerWorkerPoolImpl::SchedulerWorkerDelegateImpl:: |
536 GetSleepTimeout() { | 539 GetSleepTimeout() { |
537 return outer_->suggested_reclaim_time_; | 540 return outer_->suggested_reclaim_time_; |
538 } | 541 } |
539 | 542 |
540 bool SchedulerWorkerPoolImpl::SchedulerWorkerDelegateImpl::CanDetach( | 543 bool SchedulerWorkerPoolImpl::SchedulerWorkerDelegateImpl::CanDetach( |
541 SchedulerWorker* worker) { | 544 SchedulerWorker* worker) { |
542 // It's not an issue if |num_single_threaded_runners_| is incremented after | 545 // It's not an issue if |num_single_threaded_runners_| is incremented after |
543 // this because the newly created TaskRunner (from which no task has run yet) | 546 // this because the newly created SingleThreadTaskRunner (from which no task |
544 // will simply run all its tasks on the next physical thread created by the | 547 // has run yet) will simply run all its tasks on the next physical thread |
545 // worker. | 548 // created by the worker. |
546 const bool can_detach = | 549 const bool can_detach = |
547 !idle_start_time_.is_null() && | 550 !idle_start_time_.is_null() && |
548 (TimeTicks::Now() - idle_start_time_) > outer_->suggested_reclaim_time_ && | 551 (TimeTicks::Now() - idle_start_time_) > outer_->suggested_reclaim_time_ && |
549 worker != outer_->PeekAtIdleWorkersStack() && | 552 worker != outer_->PeekAtIdleWorkersStack() && |
550 !subtle::Acquire_Load(&num_single_threaded_runners_) && | 553 !subtle::NoBarrier_Load(&num_single_threaded_runners_) && |
551 outer_->CanWorkerDetachForTesting(); | 554 outer_->CanWorkerDetachForTesting(); |
552 return can_detach; | 555 return can_detach; |
553 } | 556 } |
554 | 557 |
555 SchedulerWorkerPoolImpl::SchedulerWorkerPoolImpl( | 558 SchedulerWorkerPoolImpl::SchedulerWorkerPoolImpl( |
556 StringPiece name, | 559 StringPiece name, |
557 SchedulerWorkerPoolParams::IORestriction io_restriction, | 560 SchedulerWorkerPoolParams::IORestriction io_restriction, |
558 const TimeDelta& suggested_reclaim_time, | 561 const TimeDelta& suggested_reclaim_time, |
559 TaskTracker* task_tracker, | 562 TaskTracker* task_tracker, |
560 DelayedTaskManager* delayed_task_manager) | 563 DelayedTaskManager* delayed_task_manager) |
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646 AutoSchedulerLock auto_lock(idle_workers_stack_lock_); | 649 AutoSchedulerLock auto_lock(idle_workers_stack_lock_); |
647 idle_workers_stack_.Remove(worker); | 650 idle_workers_stack_.Remove(worker); |
648 } | 651 } |
649 | 652 |
650 bool SchedulerWorkerPoolImpl::CanWorkerDetachForTesting() { | 653 bool SchedulerWorkerPoolImpl::CanWorkerDetachForTesting() { |
651 return !worker_detachment_disallowed_.IsSet(); | 654 return !worker_detachment_disallowed_.IsSet(); |
652 } | 655 } |
653 | 656 |
654 } // namespace internal | 657 } // namespace internal |
655 } // namespace base | 658 } // namespace base |
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