100 lines
3.0 KiB
C++
100 lines
3.0 KiB
C++
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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/deferred_sequenced_task_runner.h"
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#include "base/bind.h"
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#include "base/logging.h"
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namespace base {
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DeferredSequencedTaskRunner::DeferredTask::DeferredTask() {
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}
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DeferredSequencedTaskRunner::DeferredTask::~DeferredTask() {
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}
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DeferredSequencedTaskRunner::DeferredSequencedTaskRunner(
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const scoped_refptr<SequencedTaskRunner>& target_task_runner)
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: started_(false),
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target_task_runner_(target_task_runner) {
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}
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DeferredSequencedTaskRunner::~DeferredSequencedTaskRunner() {
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}
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bool DeferredSequencedTaskRunner::PostDelayedTask(
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const tracked_objects::Location& from_here,
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const Closure& task,
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TimeDelta delay) {
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AutoLock lock(lock_);
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if (started_) {
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DCHECK(deferred_tasks_queue_.empty());
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return target_task_runner_->PostDelayedTask(from_here, task, delay);
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}
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QueueDeferredTask(from_here, task, delay, false /* is_non_nestable */);
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return true;
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}
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bool DeferredSequencedTaskRunner::RunsTasksOnCurrentThread() const {
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return target_task_runner_->RunsTasksOnCurrentThread();
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}
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bool DeferredSequencedTaskRunner::PostNonNestableDelayedTask(
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const tracked_objects::Location& from_here,
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const Closure& task,
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TimeDelta delay) {
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AutoLock lock(lock_);
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if (started_) {
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DCHECK(deferred_tasks_queue_.empty());
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return target_task_runner_->PostNonNestableDelayedTask(from_here,
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task,
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delay);
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}
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QueueDeferredTask(from_here, task, delay, true /* is_non_nestable */);
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return true;
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}
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void DeferredSequencedTaskRunner::QueueDeferredTask(
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const tracked_objects::Location& from_here,
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const Closure& task,
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TimeDelta delay,
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bool is_non_nestable) {
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DeferredTask deferred_task;
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deferred_task.posted_from = from_here;
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deferred_task.task = task;
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deferred_task.delay = delay;
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deferred_task.is_non_nestable = is_non_nestable;
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deferred_tasks_queue_.push_back(deferred_task);
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}
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void DeferredSequencedTaskRunner::Start() {
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AutoLock lock(lock_);
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DCHECK(!started_);
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started_ = true;
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for (std::vector<DeferredTask>::iterator i = deferred_tasks_queue_.begin();
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i != deferred_tasks_queue_.end();
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++i) {
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const DeferredTask& task = *i;
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if (task.is_non_nestable) {
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target_task_runner_->PostNonNestableDelayedTask(task.posted_from,
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task.task,
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task.delay);
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} else {
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target_task_runner_->PostDelayedTask(task.posted_from,
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task.task,
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task.delay);
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}
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// Replace the i-th element in the |deferred_tasks_queue_| with an empty
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// |DelayedTask| to ensure that |task| is destroyed before the next task
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// is posted.
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*i = DeferredTask();
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}
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deferred_tasks_queue_.clear();
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}
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} // namespace base
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