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