127 lines
3.9 KiB
C++
127 lines
3.9 KiB
C++
// 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 <utility>
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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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: is_non_nestable(false) {
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}
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DeferredSequencedTaskRunner::DeferredTask::DeferredTask(DeferredTask&& other) =
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default;
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DeferredSequencedTaskRunner::DeferredTask::~DeferredTask() = default;
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DeferredSequencedTaskRunner::DeferredTask&
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DeferredSequencedTaskRunner::DeferredTask::operator=(DeferredTask&& other) =
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default;
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DeferredSequencedTaskRunner::DeferredSequencedTaskRunner(
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scoped_refptr<SequencedTaskRunner> target_task_runner)
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: DeferredSequencedTaskRunner() {
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DCHECK(target_task_runner);
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target_task_runner_ = std::move(target_task_runner);
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}
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DeferredSequencedTaskRunner::DeferredSequencedTaskRunner()
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: created_thread_id_(PlatformThread::CurrentId()) {}
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bool DeferredSequencedTaskRunner::PostDelayedTask(const Location& from_here,
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OnceClosure 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, std::move(task),
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delay);
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}
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QueueDeferredTask(from_here, std::move(task), delay,
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false /* is_non_nestable */);
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return true;
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}
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bool DeferredSequencedTaskRunner::RunsTasksInCurrentSequence() const {
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AutoLock lock(lock_);
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if (target_task_runner_)
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return target_task_runner_->RunsTasksInCurrentSequence();
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return created_thread_id_ == PlatformThread::CurrentId();
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}
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bool DeferredSequencedTaskRunner::PostNonNestableDelayedTask(
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const Location& from_here,
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OnceClosure 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(
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from_here, std::move(task), delay);
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}
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QueueDeferredTask(from_here, std::move(task), delay,
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true /* is_non_nestable */);
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return true;
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}
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void DeferredSequencedTaskRunner::Start() {
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AutoLock lock(lock_);
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StartImpl();
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}
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void DeferredSequencedTaskRunner::StartWithTaskRunner(
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scoped_refptr<SequencedTaskRunner> target_task_runner) {
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AutoLock lock(lock_);
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DCHECK(!target_task_runner_);
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DCHECK(target_task_runner);
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target_task_runner_ = std::move(target_task_runner);
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StartImpl();
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}
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DeferredSequencedTaskRunner::~DeferredSequencedTaskRunner() = default;
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void DeferredSequencedTaskRunner::QueueDeferredTask(const Location& from_here,
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OnceClosure task,
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TimeDelta delay,
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bool is_non_nestable) {
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lock_.AssertAcquired();
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// Use CHECK instead of DCHECK to crash earlier. See http://crbug.com/711167
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// for details.
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CHECK(task);
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DeferredTask deferred_task;
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deferred_task.posted_from = from_here;
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deferred_task.task = std::move(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(std::move(deferred_task));
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}
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void DeferredSequencedTaskRunner::StartImpl() {
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lock_.AssertAcquired(); // Callers should have grabbed the lock.
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DCHECK(!started_);
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started_ = true;
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DCHECK(target_task_runner_);
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for (auto& task : deferred_tasks_queue_) {
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if (task.is_non_nestable) {
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target_task_runner_->PostNonNestableDelayedTask(
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task.posted_from, std::move(task.task), task.delay);
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} else {
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target_task_runner_->PostDelayedTask(task.posted_from,
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std::move(task.task), task.delay);
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}
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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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