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// Copyright (c) 2012 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.
#ifndef BASE_MESSAGE_LOOP_MESSAGE_LOOP_TASK_RUNNER_H_
#define BASE_MESSAGE_LOOP_MESSAGE_LOOP_TASK_RUNNER_H_
#include "base/base_export.h"
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/pending_task.h"
#include "base/single_thread_task_runner.h"
#include "base/synchronization/lock.h"
#include "base/threading/platform_thread.h"
namespace base {
namespace internal {
class IncomingTaskQueue;
// A stock implementation of SingleThreadTaskRunner that is created and managed
// by a MessageLoop. For now a MessageLoopTaskRunner can only be created as
// part of a MessageLoop.
class BASE_EXPORT MessageLoopTaskRunner : public SingleThreadTaskRunner {
public:
explicit MessageLoopTaskRunner(
scoped_refptr<IncomingTaskQueue> incoming_queue);
// Initialize this message loop task runner on the current thread.
void BindToCurrentThread();
// SingleThreadTaskRunner implementation
bool PostDelayedTask(const tracked_objects::Location& from_here,
OnceClosure task,
base::TimeDelta delay) override;
bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
OnceClosure task,
base::TimeDelta delay) override;
bool RunsTasksOnCurrentThread() const override;
private:
friend class RefCountedThreadSafe<MessageLoopTaskRunner>;
~MessageLoopTaskRunner() override;
// The incoming queue receiving all posted tasks.
scoped_refptr<IncomingTaskQueue> incoming_queue_;
// ID of the thread |this| was created on. Could be accessed on multiple
// threads, protected by |valid_thread_id_lock_|.
PlatformThreadId valid_thread_id_;
mutable Lock valid_thread_id_lock_;
DISALLOW_COPY_AND_ASSIGN(MessageLoopTaskRunner);
};
} // namespace internal
} // namespace base
#endif // BASE_MESSAGE_LOOP_MESSAGE_LOOP_TASK_RUNNER_H_
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