mutex.h

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#ifndef MUTEX_CLASS
#define MUTEX_CLASS
 
/*****************************************************************************\
*                                                                             *
*  Name   : mutex                                                             *
*  Author : Chris Koeritz                                                     *
*                                                                             *
*******************************************************************************
* Copyright (c) 1996-$now By Author.  This program is free software; you can  *
* redistribute it and/or modify it under the terms of the GNU General Public  *
* License as published by the Free Software Foundation; either version 2 of   *
* the License or (at your option) any later version.  This is online at:      *
*     http://www.fsf.org/copyleft/gpl.html                                    *
* Please send any updates to: fred@gruntose.com                               *
\*****************************************************************************/
 
#include "contracts.h"
 
 
namespace basis {
 
class mutex : public virtual base_synchronizer
{
public:
  mutex();  
 
  virtual ~mutex();
 
  void construct();
 
  void destruct();
 
  void lock();
 
  void unlock();
 
  virtual void establish_lock();
  virtual void repeal_lock();
 
private:
  void *c_os_mutex;  
 
  void defang();
 
  mutex(const mutex &);  
  mutex &operator =(const mutex &);  
};
 
 
 
class auto_synchronizer
{
public:
  auto_synchronizer(base_synchronizer &locker) : _locker(locker)
          { _locker.establish_lock(); }
 
  ~auto_synchronizer() { _locker.repeal_lock(); }
 
private:
  base_synchronizer &_locker;  
 
  // disallowed.
  auto_synchronizer(const auto_synchronizer &locker);
  auto_synchronizer &operator =(const auto_synchronizer &locker);
};
 
} //namespace.
 
#endif