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| 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 | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "base/task_scheduler/scheduler_service_thread.h" | |
| 6 | |
| 7 #include <utility> | |
| 8 | |
| 9 #include "base/logging.h" | |
| 10 #include "base/memory/ptr_util.h" | |
| 11 #include "base/synchronization/waitable_event.h" | |
| 12 #include "base/task_scheduler/delayed_task_manager.h" | |
| 13 #include "base/task_scheduler/scheduler_worker.h" | |
| 14 #include "base/task_scheduler/sequence.h" | |
| 15 #include "base/threading/thread_checker.h" | |
| 16 #include "base/time/time.h" | |
| 17 | |
| 18 namespace base { | |
| 19 namespace internal { | |
| 20 namespace { | |
| 21 | |
| 22 class ServiceThreadDelegate : public SchedulerWorker::Delegate { | |
| 23 public: | |
| 24 ServiceThreadDelegate(DelayedTaskManager* delayed_task_manager) | |
| 25 : delayed_task_manager_(delayed_task_manager) {} | |
| 26 | |
| 27 // SchedulerWorker::Delegate: | |
| 28 void OnMainEntry(SchedulerWorker* worker, | |
| 29 const TimeDelta& detach_duration) override { | |
| 30 DCHECK(detach_duration.is_max()); | |
| 31 } | |
| 32 | |
| 33 scoped_refptr<Sequence> GetWork(SchedulerWorker* worker) override { | |
| 34 delayed_task_manager_->PostReadyTasks(); | |
| 35 return nullptr; | |
| 36 } | |
| 37 | |
| 38 void DidRunTaskWithPriority(TaskPriority task_priority, | |
| 39 const TimeDelta& task_latency) override { | |
| 40 NOTREACHED() | |
| 41 << "GetWork() never returns a sequence so no task should ever run."; | |
| 42 } | |
| 43 | |
| 44 void ReEnqueueSequence(scoped_refptr<Sequence> sequence) override { | |
| 45 NOTREACHED() << | |
| 46 "GetWork() never returns a sequence so there's nothing to reenqueue."; | |
| 47 } | |
| 48 | |
| 49 TimeDelta GetSleepTimeout() override { | |
| 50 const TimeTicks next_time = delayed_task_manager_->GetDelayedRunTime(); | |
| 51 if (next_time.is_null()) | |
| 52 return TimeDelta::Max(); | |
| 53 | |
| 54 // For delayed tasks with delays that are really close to each other, it is | |
| 55 // possible for the current time to advance beyond the required | |
| 56 // GetDelayedWaitTime. Return a minimum of TimeDelta() in the event that | |
| 57 // happens. | |
| 58 TimeDelta sleep_time = next_time - delayed_task_manager_->Now(); | |
| 59 const TimeDelta zero_delta; | |
| 60 return sleep_time < zero_delta ? zero_delta : sleep_time; | |
| 61 } | |
| 62 | |
| 63 bool CanDetach(SchedulerWorker* worker) override { | |
| 64 return false; | |
| 65 } | |
| 66 | |
| 67 private: | |
| 68 DelayedTaskManager* const delayed_task_manager_; | |
| 69 | |
| 70 DISALLOW_COPY_AND_ASSIGN(ServiceThreadDelegate); | |
| 71 }; | |
| 72 | |
| 73 } // namespace | |
| 74 | |
| 75 SchedulerServiceThread::~SchedulerServiceThread() = default; | |
| 76 | |
| 77 // static | |
| 78 std::unique_ptr<SchedulerServiceThread> SchedulerServiceThread::Create( | |
| 79 TaskTracker* task_tracker, DelayedTaskManager* delayed_task_manager) { | |
| 80 std::unique_ptr<SchedulerWorker> worker = SchedulerWorker::Create( | |
| 81 ThreadPriority::NORMAL, | |
| 82 MakeUnique<ServiceThreadDelegate>(delayed_task_manager), task_tracker, | |
| 83 SchedulerWorker::InitialState::ALIVE); | |
| 84 if (!worker) | |
| 85 return nullptr; | |
| 86 | |
| 87 return WrapUnique(new SchedulerServiceThread(std::move(worker))); | |
| 88 } | |
| 89 | |
| 90 void SchedulerServiceThread::WakeUp() { | |
| 91 worker_->WakeUp(); | |
| 92 } | |
| 93 | |
| 94 void SchedulerServiceThread::JoinForTesting() { | |
| 95 worker_->JoinForTesting(); | |
| 96 } | |
| 97 | |
| 98 SchedulerServiceThread::SchedulerServiceThread( | |
| 99 std::unique_ptr<SchedulerWorker> worker) : worker_(std::move(worker)) {} | |
| 100 | |
| 101 } // namespace internal | |
| 102 } // namespace base | |
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Chromium Code Reviews
Issue 2405243003:
TaskScheduler: Replace the SchedulerServiceThread with a base::Thread. (Closed)
