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/*
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 * Project: S.Ha.R.K.
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 *
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 * Coordinators:
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 *   Giorgio Buttazzo    <giorgio@sssup.it>
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 *   Paolo Gai           <pj@gandalf.sssup.it>
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 *
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 * Authors     :
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 *   Paolo Gai           <pj@gandalf.sssup.it>
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 *   Massimiliano Giorgi <massy@gandalf.sssup.it>
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 *   Luca Abeni          <luca@gandalf.sssup.it>
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 *   (see the web pages for full authors list)
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 *
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 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
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 *
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 * http://www.sssup.it
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 * http://retis.sssup.it
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 * http://shark.sssup.it
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 */
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/***************************************
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Mutexs for the user.
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***************************************/
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/*
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 * CVS :        $Id: mutex.h,v 1.2 2003-03-13 13:41:04 pj Exp $
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 *
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 * File:        $File$
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 * Revision:    $Revision: 1.2 $
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 * Last update: $Date: 2003-03-13 13:41:04 $
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 */
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/*
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 * Copyright (C) 1999,2000 Massimiliano Giorgi
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 */
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#ifndef _MUTEX_H
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#define _MUTEX_H
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/*
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#include <hartik/const.h>
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typedef struct {
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  QUEUE queue;
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  int   value;
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} mutex_t;
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void mutex_init(mutex_t *);
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void mutex_lock(mutex_t *);
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int  mutex_trylock(mutex_t *);
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void mutex_unlock(mutex_t *);
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*/
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/*
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 * temporary hack
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 */
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#include <h/sys/kern.h>
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#include <h/sys/const.h>
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#include "ll/sys/cdefs.h"
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__BEGIN_DECLS
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/*+ a mutex object +*/
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typedef SEM mutex_t;
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/*
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  The following macros require a pointer to a mutex object and
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  return nothing.
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*/
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/* Initialize a mutex object +*/
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#define mutex_init(ptr)    { *(ptr)=sem_create(1); }
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/*+ Lock a mutex object +*/
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#define mutex_lock(ptr)    { sem_wait(*(ptr),BLOCK); }
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/*+ Try to lock a mutex (return 0 on success locking) +*/
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#define mutex_trylock(ptr) { sem_wait(*(ptr),NON_BLOCK); }
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/*+ Unlock a mutex +*/
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#define mutex_unlock(ptr)  { sem_signal(*(ptr)); }
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__END_DECLS
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#endif
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