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Viewing changes to debian/modules/ngx_pagespeed/psol/include/third_party/chromium/src/base/deferred_sequenced_task_runner.h

  • Committer: Vivian
  • Date: 2015-12-04 18:20:11 UTC
  • Revision ID: git-v1:a36f2bc32e884f7473b3a47040e5411306144d7d
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debian/modules/ngx_pagespeed/psol/include/third_party/chromium/src/base/deferred_sequenced_task_runner.h
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// 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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#ifndef BASE_DEFERRED_SEQUENCED_TASKRUNNER_H_
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#define BASE_DEFERRED_SEQUENCED_TASKRUNNER_H_
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#include <vector>
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#include "base/base_export.h"
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#include "base/basictypes.h"
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#include "base/callback.h"
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#include "base/compiler_specific.h"
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#include "base/memory/ref_counted.h"
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#include "base/sequenced_task_runner.h"
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#include "base/synchronization/lock.h"
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#include "base/time/time.h"
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#include "base/tracked_objects.h"
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namespace base {
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// A DeferredSequencedTaskRunner is a subclass of SequencedTaskRunner that
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// queues up all requests until the first call to Start() is issued.
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class BASE_EXPORT DeferredSequencedTaskRunner : public SequencedTaskRunner {
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 public:
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  explicit DeferredSequencedTaskRunner(
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      const scoped_refptr<SequencedTaskRunner>& target_runner);
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  // TaskRunner implementation
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  virtual bool PostDelayedTask(const tracked_objects::Location& from_here,
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                               const Closure& task,
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                               TimeDelta delay) OVERRIDE;
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  virtual bool RunsTasksOnCurrentThread() const OVERRIDE;
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  // SequencedTaskRunner implementation
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  virtual bool PostNonNestableDelayedTask(
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      const tracked_objects::Location& from_here,
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      const Closure& task,
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      TimeDelta delay) OVERRIDE;
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  // Start the execution - posts all queued tasks to the target executor. The
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  // deferred tasks are posted with their initial delay, meaning that the task
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  // execution delay is actually measured from Start.
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  // Fails when called a second time.
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  void Start();
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 private:
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  struct DeferredTask  {
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    DeferredTask();
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    ~DeferredTask();
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    tracked_objects::Location posted_from;
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    Closure task;
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    // The delay this task was initially posted with.
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    TimeDelta delay;
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    bool is_non_nestable;
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  };
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  virtual ~DeferredSequencedTaskRunner();
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  // Creates a |Task| object and adds it to |deferred_tasks_queue_|.
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  void QueueDeferredTask(const tracked_objects::Location& from_here,
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                         const Closure& task,
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                         TimeDelta delay,
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                         bool is_non_nestable);
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  // // Protects |started_| and |deferred_tasks_queue_|.
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  mutable Lock lock_;
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  bool started_;
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  const scoped_refptr<SequencedTaskRunner> target_task_runner_;
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  std::vector<DeferredTask> deferred_tasks_queue_;
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  DISALLOW_COPY_AND_ASSIGN(DeferredSequencedTaskRunner);
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};
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}  // namespace base
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#endif  // BASE_DEFERRED_SEQUENCED_TASKRUNNER_H_