/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_layers_CompositorThread_h

#define mozilla_layers_CompositorThread_h

#include "base/basictypes.h"            // for DISALLOW_EVIL_CONSTRUCTORS

#include "base/platform_thread.h"       // for PlatformThreadId

#include "base/thread.h"                // for Thread

#include "base/message_loop.h"

#include "nsISupportsImpl.h"

#include "ThreadSafeRefcountingWithMainThreadDestruction.h"

namespace mozilla {

namespace layers {

class CompositorThreadHolder final

{

  NS_INLINE_DECL_THREADSAFE_REFCOUNTING_WITH_MAIN_THREAD_DESTRUCTION(CompositorThreadHolder)

public:

  CompositorThreadHolder();

  base::Thread* GetCompositorThread() const {

    return mCompositorThread;

  }

  static CompositorThreadHolder* GetSingleton();

  static bool IsActive() {

    return !!GetSingleton();

  }

  /**

   * Creates the compositor thread and the global compositor map.

   */

  static void Start();

  /*

   * Waits for all [CrossProcess]CompositorBridgeParents to shutdown and

   * releases compositor-thread owned resources.

   */

  static void Shutdown();

  static MessageLoop* Loop();

  // Returns true if the calling thread is the compositor thread.

  static bool IsInCompositorThread();

private:

  ~CompositorThreadHolder();

  base::Thread* const mCompositorThread;

  static base::Thread* CreateCompositorThread();

  static void DestroyCompositorThread(base::Thread* aCompositorThread);

  friend class CompositorBridgeParent;

};

base::Thread* CompositorThread();

} // namespace layers

} // namespace mozilla

#endif // mozilla_layers_CompositorThread_h