Move mus to //services/ui

components/mus/gles2/command_buffer_task_runner.h

-// 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.
-
-#ifndef COMPONENTS_MUS_GLES2_COMMAND_BUFFER_TASK_RUNNER_H_
-#define COMPONENTS_MUS_GLES2_COMMAND_BUFFER_TASK_RUNNER_H_
-
-#include <deque>
-#include <map>
-#include <memory>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/single_thread_task_runner.h"
-#include "base/synchronization/condition_variable.h"
-#include "base/synchronization/lock.h"
-#include "base/threading/thread_checker.h"
-
-namespace mus {
-
-class CommandBufferDriver;
-
-// This class maintains tasks submitted by |CommandBufferImpl|. Those tasks will
-// be executed on the main thread. But if the main thread is blocked in
-// |CommandBufferLocal::OnWaitFenceSync()| by waiting a sync point, the
-// |CommandBufferTaskRunner::RunOneTask()| could be used for executing a task
-// from other command buffers which may retire the sync point.
-class CommandBufferTaskRunner
-    : public base::RefCountedThreadSafe<CommandBufferTaskRunner> {
- public:
-  CommandBufferTaskRunner();
-
-  // TaskCallback returns true if the task is completed and should be removed
-  // from the task queue, otherwise returns false.
-  typedef base::Callback<bool(void)> TaskCallback;
-  bool PostTask(const CommandBufferDriver* driver,
-                const TaskCallback& task);
-
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner() const {
-    return task_runner_;
-  }
-
- private:
-  friend class base::RefCountedThreadSafe<CommandBufferTaskRunner>;
-
-  ~CommandBufferTaskRunner();
-
-  // Run one command buffer task from a scheduled command buffer.
-  // When there isn't any command buffer task, and if the |block| is false,
-  // this function will return false immediately, otherwise, this function
-  // will be blocked until a task is available for executing.
-  bool RunOneTaskInternalLocked();
-
-  // Post a task to the main thread to execute tasks in |driver_map_|, if it is
-  // necessary.
-  void ScheduleTaskIfNecessaryLocked();
-
-  // The callback function for executing tasks in |driver_map_|.
-  void RunCommandBufferTask();
-
-  base::ThreadChecker thread_checker_;
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
-
-  typedef std::deque<TaskCallback> TaskQueue;
-  typedef std::map<const CommandBufferDriver*, TaskQueue> DriverMap;
-  DriverMap driver_map_;
-  bool need_post_task_;
-
-  // The access lock for |driver_map_| and |need_post_task_|.
-  base::Lock lock_;
-
-  DISALLOW_COPY_AND_ASSIGN(CommandBufferTaskRunner);
-};
-
-}  // namespace mus
-
-#endif  // COMPONENTS_MUS_GLES2_COMMAND_BUFFER_TASK_RUNNER_H_