singleton_application.h

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#ifndef SINGLETON_APPLICATION_CLASS
#define SINGLETON_APPLICATION_CLASS
 
/*****************************************************************************\
*                                                                             *
*  Name   : singleton_application                                             *
*  Author : Chris Koeritz                                                     *
*                                                                             *
*******************************************************************************
* Copyright (c) 2006-$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 <basis/astring.h>
#include <basis/contracts.h>
#include <processes/rendezvous.h>
 
namespace application {
 
class singleton_application
{
public:
  singleton_application(const basis::astring &application_name,
          const basis::astring &user_name = basis::astring::empty_string());
 
  virtual ~singleton_application();
 
  DEFINE_CLASS_NAME("singleton_application");
 
  bool already_tried() const;
 
  bool allow_this_instance();
 
  bool already_running();
 
  void release_lock();
 
private:
  int c_initial_try;  
    /* if c_initial_try is zero, no attempt made yet.  if it's 1, then tried
    and succeeded.  if it's greater than one, then tried and failed. */
  processes::rendezvous *_app_lock;  
  bool _got_lock;  
};
 
} //namespace.
 
#endif