reference_counter.h

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 // $Id: reference_counter.h 3391 2009-05-26 03:50:35Z benkirk $

// The libMesh Finite Element Library.
// Copyright (C) 2002-2008 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
  
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
  
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
  
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA



#ifndef __reference_counter_h__
#define __reference_counter_h__

// Local includes
#include "libmesh_config.h"
#include "threads.h"

// C++ includes
#include <string>
#include <map>



// ------------------------------------------------------------
// ReferenceCounter class definition
class ReferenceCounter
{
protected:

  ReferenceCounter ();

public:
  
  virtual ~ReferenceCounter ();

  static std::string get_info ();
  
  static void print_info ();

  static unsigned int n_objects ()
  { return _n_objects; }

  
protected:

  
  void increment_constructor_count (const std::string& name);
  
  void increment_destructor_count (const std::string& name);


#if defined(LIBMESH_ENABLE_REFERENCE_COUNTING) && defined(DEBUG)
  
  typedef std::map<std::string, std::pair<unsigned int,
                                          unsigned int> > Counts;

  static Counts _counts;

#endif
  
  static Threads::atomic<unsigned int> _n_objects;

  static Threads::spin_mutex _mutex;
};



// ------------------------------------------------------------
// ReferenceCounter class inline methods
inline ReferenceCounter::ReferenceCounter()
{
  _n_objects++;
}



inline ReferenceCounter::~ReferenceCounter()
{
  _n_objects--;
}






#if defined(LIBMESH_ENABLE_REFERENCE_COUNTING) && defined(DEBUG)
inline
void ReferenceCounter::increment_constructor_count (const std::string& name)
{
  Threads::spin_mutex::scoped_lock lock(Threads::spin_mtx);
  std::pair<unsigned int, unsigned int>& p = _counts[name];

  p.first++;
}
#else
inline
void ReferenceCounter::increment_constructor_count (const std::string&)
{
}
#endif



#if defined(LIBMESH_ENABLE_REFERENCE_COUNTING) && defined(DEBUG)
inline
void ReferenceCounter::increment_destructor_count (const std::string& name)
{
  Threads::spin_mutex::scoped_lock lock(Threads::spin_mtx);
  std::pair<unsigned int, unsigned int>& p = _counts[name];

  p.second++;
}
#else
inline
void ReferenceCounter::increment_destructor_count (const std::string&)
{
}
#endif



#endif // end #ifndef __reference_counter_h__