| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "cc/base/unique_notifier.h" |
| |
| #include "base/bind.h" |
| #include "base/callback_helpers.h" |
| #include "base/location.h" |
| #include "base/task/sequenced_task_runner.h" |
| |
| namespace cc { |
| |
| UniqueNotifier::UniqueNotifier(base::SequencedTaskRunner* task_runner, |
| base::RepeatingClosure closure) |
| : task_runner_(task_runner), |
| closure_(std::move(closure)), |
| notification_pending_(false) {} |
| |
| UniqueNotifier::~UniqueNotifier() = default; |
| |
| void UniqueNotifier::Cancel() { |
| DCHECK(task_runner_->RunsTasksInCurrentSequence()); |
| base::AutoLock hold(lock_); |
| notification_pending_ = false; |
| } |
| |
| void UniqueNotifier::Schedule() { |
| DCHECK(task_runner_->RunsTasksInCurrentSequence()); |
| base::AutoLock hold(lock_); |
| if (notification_pending_) |
| return; |
| |
| task_runner_->PostTask( |
| FROM_HERE, |
| base::BindOnce(&UniqueNotifier::Notify, weak_ptr_factory_.GetWeakPtr())); |
| notification_pending_ = true; |
| } |
| |
| void UniqueNotifier::Notify() { |
| DCHECK(task_runner_->RunsTasksInCurrentSequence()); |
| // Scope to release |lock_| before running the closure. |
| { |
| base::AutoLock hold(lock_); |
| if (!notification_pending_) |
| return; |
| |
| // Note that the order here is important in case closure schedules another |
| // run. |
| notification_pending_ = false; |
| } |
| |
| closure_.Run(); |
| } |
| |
| } // namespace cc |