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// Copyright 2014 The Chromium Authors
// 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 <utility>
#include "base/functional/bind.h"
#include "base/functional/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
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