// Filename: blockerSimple.h
// Created by:  drose (20Jun07)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001 - 2004, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://etc.cmu.edu/panda3d/docs/license/ .
//
// To contact the maintainers of this program write to
// panda3d-general@lists.sourceforge.net .
//
////////////////////////////////////////////////////////////////////

#ifndef BLOCKERSIMPLE_H
#define BLOCKERSIMPLE_H

#include "pandabase.h"
#include "selectThreadImpl.h"

#ifdef THREAD_SIMPLE_IMPL

#include "pnotify.h"

////////////////////////////////////////////////////////////////////
//       Class : BlockerSimple
// Description : This is a base class for MutexSimpleImpl and
//               ConditionVarSimpleImpl.  It represents a
//               synchronization primitive that one or more threads
//               might be blocked on.
////////////////////////////////////////////////////////////////////
class EXPCL_PANDA BlockerSimple {
protected:
  INLINE BlockerSimple();
  INLINE ~BlockerSimple();

protected:
  enum Flags {
    // lock_count is only used for mutexes, not condition variables.
    F_lock_count   = 0x3fffffff,
    F_has_waiters  = 0x40000000,
  };

  unsigned int _flags;

  friend class ThreadSimpleManager;
};

#include "blockerSimple.I"

#endif  // THREAD_SIMPLE_IMPL

#endif
