// Filename: lightMutexHolder.I
// Created by:  drose (08Oct08)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) Carnegie Mellon University.  All rights reserved.
//
// All use of this software is subject to the terms of the revised BSD
// license.  You should have received a copy of this license along
// with this source code in a file named "LICENSE."
//
////////////////////////////////////////////////////////////////////


////////////////////////////////////////////////////////////////////
//     Function: LightMutexHolder::Constructor
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE LightMutexHolder::
LightMutexHolder(const LightMutex &mutex) {
#if defined(HAVE_THREADS) || defined(DEBUG_THREADS)
  _mutex = &mutex;
  _mutex->acquire();
#endif
}

////////////////////////////////////////////////////////////////////
//     Function: LightMutexHolder::Constructor
//       Access: Public
//  Description: If the LightMutexHolder constructor is given a pointer to
//               a LightMutex object (instead of an actual object), it will
//               first check to see if the pointer is NULL, and
//               allocate a new LightMutex if it is.  This is intended as a
//               convenience for functions that may need to reference
//               a LightMutex at static init time, when it is impossible to
//               guarantee ordering of initializers.
////////////////////////////////////////////////////////////////////
INLINE LightMutexHolder::
LightMutexHolder(LightMutex *&mutex) {
#if defined(HAVE_THREADS) || defined(DEBUG_THREADS)
  if (mutex == (LightMutex *)NULL) {
    mutex = new LightMutex;
  }
  _mutex = mutex;
  _mutex->acquire();
#endif
}

////////////////////////////////////////////////////////////////////
//     Function: LightMutexHolder::Destructor
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE LightMutexHolder::
~LightMutexHolder() {
#if defined(HAVE_THREADS) || defined(DEBUG_THREADS)
  _mutex->release();
#endif
}

////////////////////////////////////////////////////////////////////
//     Function: LightMutexHolder::Copy Constructor
//       Access: Private
//  Description: Do not attempt to copy LightMutexHolders.
////////////////////////////////////////////////////////////////////
INLINE LightMutexHolder::
LightMutexHolder(const LightMutexHolder &copy) {
  nassertv(false);
}

////////////////////////////////////////////////////////////////////
//     Function: LightMutexHolder::Copy Assignment Operator
//       Access: Private
//  Description: Do not attempt to copy LightMutexHolders.
////////////////////////////////////////////////////////////////////
INLINE void LightMutexHolder::
operator = (const LightMutexHolder &copy) {
  nassertv(false);
}