[email protected] | afecfb7 | 2013-04-18 17:17:33 | [diff] [blame] | 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 | |
[email protected] | 20ad4c20 | 2013-08-30 12:59:25 | [diff] [blame] | 12 | DeferredSequencedTaskRunner::DeferredTask::DeferredTask() |
| 13 | : is_non_nestable(false) { |
[email protected] | afecfb7 | 2013-04-18 17:17:33 | [diff] [blame] | 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 |