/* -*- 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_CondVar_h
#define mozilla_CondVar_h

#include "mozilla/BlockingResourceBase.h"
#include "mozilla/PlatformConditionVariable.h"
#include "mozilla/Mutex.h"

#ifdef MOZILLA_INTERNAL_API
#include "GeckoProfiler.h"
#endif //MOZILLA_INTERNAL_API

namespace mozilla {


/**
 * CondVar
 * Vanilla condition variable.  Please don't use this unless you have a
 * compelling reason --- Monitor provides a simpler API.
 */
class CondVar : BlockingResourceBase
{
public:
  /**
   * CondVar
   *
   * The CALLER owns |aLock|.
   *
   * @param aLock A Mutex to associate with this condition variable.
   * @param aName A name which can reference this monitor
   * @returns If failure, nullptr.
   *          If success, a valid Monitor* which must be destroyed
   *          by Monitor::DestroyMonitor()
   **/
  CondVar(Mutex& aLock, const char* aName)
    : BlockingResourceBase(aName, eCondVar)
    , mLock(&aLock)
  {
    MOZ_COUNT_CTOR(CondVar);
  }

  /**
   * ~CondVar
   * Clean up after this CondVar, but NOT its associated Mutex.
   **/
  ~CondVar()
  {
    MOZ_COUNT_DTOR(CondVar);
  }

#ifndef DEBUG
  /**
   * Wait
   * @see prcvar.h
   **/
  nsresult Wait(PRIntervalTime aInterval = PR_INTERVAL_NO_TIMEOUT)
  {

#ifdef MOZILLA_INTERNAL_API
    AUTO_PROFILER_THREAD_SLEEP;
#endif //MOZILLA_INTERNAL_API
    if (aInterval == PR_INTERVAL_NO_TIMEOUT) {
      mImpl.wait(*mLock);
    } else {
      mImpl.wait_for(*mLock, TimeDuration::FromMilliseconds(double(aInterval)));
    }
    return NS_OK;
  }
#else
  nsresult Wait(PRIntervalTime aInterval = PR_INTERVAL_NO_TIMEOUT);
#endif // ifndef DEBUG

  /**
   * Notify
   * @see prcvar.h
   **/
  nsresult Notify()
  {
    mImpl.notify_one();
    return NS_OK;
  }

  /**
   * NotifyAll
   * @see prcvar.h
   **/
  nsresult NotifyAll()
  {
    mImpl.notify_all();
    return NS_OK;
  }

#ifdef DEBUG
  /**
   * AssertCurrentThreadOwnsMutex
   * @see Mutex::AssertCurrentThreadOwns
   **/
  void AssertCurrentThreadOwnsMutex()
  {
    mLock->AssertCurrentThreadOwns();
  }

  /**
   * AssertNotCurrentThreadOwnsMutex
   * @see Mutex::AssertNotCurrentThreadOwns
   **/
  void AssertNotCurrentThreadOwnsMutex()
  {
    mLock->AssertNotCurrentThreadOwns();
  }

#else
  void AssertCurrentThreadOwnsMutex() {}
  void AssertNotCurrentThreadOwnsMutex() {}

#endif  // ifdef DEBUG

private:
  CondVar();
  CondVar(const CondVar&) = delete;
  CondVar& operator=(const CondVar&) = delete;

  Mutex* mLock;
  detail::ConditionVariableImpl mImpl;
};


} // namespace mozilla


#endif  // ifndef mozilla_CondVar_h