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/*
* Project: S.Ha.R.K.
*
* Coordinators:
* Giorgio Buttazzo <giorgio@sssup.it>
* Paolo Gai <pj@gandalf.sssup.it>
*
* Authors :
* Paolo Gai <pj@gandalf.sssup.it>
* Massimiliano Giorgi <massy@gandalf.sssup.it>
* Luca Abeni <luca@gandalf.sssup.it>
* (see the web pages for full authors list)
*
* ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
*
* http://www.sssup.it
* http://retis.sssup.it
* http://shark.sssup.it
*/
/***************************************
Mutexs for the user.
***************************************/
/*
* CVS : $Id: mutex.h,v 1.2 2003-03-13 13:41:04 pj Exp $
*
* File: $File$
* Revision: $Revision: 1.2 $
* Last update: $Date: 2003-03-13 13:41:04 $
*/
/*
* Copyright (C) 1999,2000 Massimiliano Giorgi
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef _MUTEX_H
#define _MUTEX_H
/*
#include <hartik/const.h>
typedef struct {
QUEUE queue;
int value;
} mutex_t;
void mutex_init(mutex_t *);
void mutex_lock(mutex_t *);
int mutex_trylock(mutex_t *);
void mutex_unlock(mutex_t *);
*/
/*
* temporary hack
*/
#include <h/sys/kern.h>
#include <h/sys/const.h>
#include "ll/sys/cdefs.h"
__BEGIN_DECLS
/*+ a mutex object +*/
typedef SEM mutex_t;
/*
The following macros require a pointer to a mutex object and
return nothing.
*/
/* Initialize a mutex object +*/
#define mutex_init(ptr) { *(ptr)=sem_create(1); }
/*+ Lock a mutex object +*/
#define mutex_lock(ptr) { sem_wait(*(ptr),BLOCK); }
/*+ Try to lock a mutex (return 0 on success locking) +*/
#define mutex_trylock(ptr) { sem_wait(*(ptr),NON_BLOCK); }
/*+ Unlock a mutex +*/
#define mutex_unlock(ptr) { sem_signal(*(ptr)); }
__END_DECLS
#endif