/******************************************************************************
Copyright (C) 2005 Matteo Lucarelli 

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 program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
******************************************************************************/

// wInstanceControl uses named mutex to share a state across processes
// useful to avoid multiple instances of the same program (that's why the name)

#if !defined(_INSTANCECONTROL_ML_H_INCLUDED_)
#define _INSTANCECONTROL_ML_H_INCLUDED_

class wInstanceControl
{
	public:
		
		wInstanceControl(){mh_Mutex=NULL;};
		virtual ~wInstanceControl(){free();};

		// return value: true=success, false=error
		bool lock(LPCTSTR id);		// lock shared control name 'id'
		bool free();				// free previously locked name

		// return value: true=name is free, false=name is lock
		bool isfree(LPCTSTR id);	// verify shared control name id

	private:
		HANDLE mh_Mutex;
};

#endif // !defined(_INSTANCECONTROL_ML_H_INCLUDED_)