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| 1 // Copyright (c) 2013 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/deferred_sequenced_task_runner.h" | |
| 6 | |
| 7 #include "base/bind.h" | |
| 8 #include "base/logging.h" | |
| 9 | |
| 10 namespace base { | |
| 11 | |
| 12 DeferredSequencedTaskRunner::DeferredTask::DeferredTask() | |
| 13 : is_non_nestable(false) { | |
| 14 } | |
| 15 | |
| 16 DeferredSequencedTaskRunner::DeferredTask::~DeferredTask() { | |
| 17 } | |
| 18 | |
| 19 DeferredSequencedTaskRunner::DeferredSequencedTaskRunner( | |
| 20 const scoped_refptr<SequencedTaskRunner>& target_task_runner) | |
| 21 : started_(false), | |
| 22 target_task_runner_(target_task_runner) { | |
| 23 } | |
| 24 | |
| 25 DeferredSequencedTaskRunner::~DeferredSequencedTaskRunner() { | |
| 26 } | |
| 27 | |
| 28 bool DeferredSequencedTaskRunner::PostDelayedTask( | |
| 29 const tracked_objects::Location& from_here, | |
| 30 const Closure& task, | |
| 31 TimeDelta delay) { | |
| 32 AutoLock lock(lock_); | |
| 33 if (started_) { | |
| 34 DCHECK(deferred_tasks_queue_.empty()); | |
| 35 return target_task_runner_->PostDelayedTask(from_here, task, delay); | |
| 36 } | |
| 37 | |
| 38 QueueDeferredTask(from_here, task, delay, false /* is_non_nestable */); | |
| 39 return true; | |
| 40 } | |
| 41 | |
| 42 bool DeferredSequencedTaskRunner::RunsTasksOnCurrentThread() const { | |
| 43 return target_task_runner_->RunsTasksOnCurrentThread(); | |
| 44 } | |
| 45 | |
| 46 bool DeferredSequencedTaskRunner::PostNonNestableDelayedTask( | |
| 47 const tracked_objects::Location& from_here, | |
| 48 const Closure& task, | |
| 49 TimeDelta delay) { | |
| 50 AutoLock lock(lock_); | |
| 51 if (started_) { | |
| 52 DCHECK(deferred_tasks_queue_.empty()); | |
| 53 return target_task_runner_->PostNonNestableDelayedTask(from_here, | |
| 54 task, | |
| 55 delay); | |
| 56 } | |
| 57 QueueDeferredTask(from_here, task, delay, true /* is_non_nestable */); | |
| 58 return true; | |
| 59 } | |
| 60 | |
| 61 void DeferredSequencedTaskRunner::QueueDeferredTask( | |
| 62 const tracked_objects::Location& from_here, | |
| 63 const Closure& task, | |
| 64 TimeDelta delay, | |
| 65 bool is_non_nestable) { | |
| 66 DeferredTask deferred_task; | |
| 67 deferred_task.posted_from = from_here; | |
| 68 deferred_task.task = task; | |
| 69 deferred_task.delay = delay; | |
| 70 deferred_task.is_non_nestable = is_non_nestable; | |
| 71 deferred_tasks_queue_.push_back(deferred_task); | |
| 72 } | |
| 73 | |
| 74 | |
| 75 void DeferredSequencedTaskRunner::Start() { | |
| 76 AutoLock lock(lock_); | |
| 77 DCHECK(!started_); | |
| 78 started_ = true; | |
| 79 for (std::vector<DeferredTask>::iterator i = deferred_tasks_queue_.begin(); | |
| 80 i != deferred_tasks_queue_.end(); | |
| 81 ++i) { | |
| 82 const DeferredTask& task = *i; | |
| 83 if (task.is_non_nestable) { | |
| 84 target_task_runner_->PostNonNestableDelayedTask(task.posted_from, | |
| 85 task.task, | |
| 86 task.delay); | |
| 87 } else { | |
| 88 target_task_runner_->PostDelayedTask(task.posted_from, | |
| 89 task.task, | |
| 90 task.delay); | |
| 91 } | |
| 92 // Replace the i-th element in the |deferred_tasks_queue_| with an empty | |
| 93 // |DelayedTask| to ensure that |task| is destroyed before the next task | |
| 94 // is posted. | |
| 95 *i = DeferredTask(); | |
| 96 } | |
| 97 deferred_tasks_queue_.clear(); | |
| 98 } | |
| 99 | |
| 100 } // namespace base | |
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