/* -*- 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_GFX_SYNCHRONOUSTASK_H

#define MOZILLA_GFX_SYNCHRONOUSTASK_H

#include "mozilla/ReentrantMonitor.h"   // for ReentrantMonitor, etc

namespace mozilla {

namespace layers {

// Helper that creates a monitor and a "done" flag, then enters the monitor.

class MOZ_STACK_CLASS SynchronousTask

{

  friend class AutoCompleteTask;

public:

  explicit SynchronousTask(const char* name)

   : mMonitor(name),

     mAutoEnter(mMonitor),

     mDone(false)

  {}

  void Wait() {

    while (!mDone) {

      mMonitor.Wait();

    }

  }

private:

  void Complete() {

    mDone = true;

    mMonitor.NotifyAll();

  }

private:

  ReentrantMonitor mMonitor;

  ReentrantMonitorAutoEnter mAutoEnter;

  bool mDone;

};

class MOZ_STACK_CLASS AutoCompleteTask

{

public:

  explicit AutoCompleteTask(SynchronousTask* aTask)

   : mTask(aTask),

     mAutoEnter(aTask->mMonitor)

  {

  }

  ~AutoCompleteTask() {

    mTask->Complete();

  }

private:

  SynchronousTask* mTask;

  ReentrantMonitorAutoEnter mAutoEnter;

};

}

}

#endif