singleton_application.cpp

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#ifndef SINGLETON_APPLICATION_IMPLEMENTATION_FILE
#define SINGLETON_APPLICATION_IMPLEMENTATION_FILE

/*****************************************************************************\
*                                                                             *
*  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 "filename.h"
#include "rendezvous.h"
#include "singleton_application.h"

#include <basis/function.h>

singleton_application::singleton_application(const istring &application_name,
    const istring &user_name)
: _app_lock(new rendezvous(filename(application_name).basename().raw()
      + "__" + user_name)),
  _got_lock(false)
{
}

singleton_application::~singleton_application()
{
  if (_got_lock) {
    _app_lock->unlock();
  }
  WHACK(_app_lock);
  _got_lock = false;
}

bool singleton_application::allow_this_instance()
{
  if (_got_lock) return true;  // already grabbed it.
  _got_lock = _app_lock->lock(rendezvous::IMMEDIATE_RETURN);
  return _got_lock;
}


#endif //SINGLETON_APPLICATION_IMPLEMENTATION_FILE

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