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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
*/
/***************************************
Semaphores for the kernel
***************************************/
/*
* CVS : $Id: semaph.h,v 1.3 2006-03-09 16:29:17 tullio Exp $
*
* File: $File$
* Revision: $Revision: 1.3 $
* Last update: $Date: 2006-03-09 16:29:17 $
*/
/*
* Copyright (C) 1999 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 _FS_SEMAPH_H
#define _FS_SEMAPH_H
#include <kernel/int_sem.h>
#include "ll/sys/cdefs.h"
__BEGIN_DECLS
/*+ a semaphore object +*/
typedef internal_sem_t __sem_t;
/*
The following macros can be used to synchronize events; all
require a pointer to a semaphore object and return nothing;
a semaphore can have "val" resource free.
*/
/*+ Initialize a semaphore (to integer val) +*/
#define __sem_init(ptr,val) internal_sem_init((ptr),(val))
/*+ Wait for a semaphore +*/
#define __sem_wait(ptr) (internal_sem_wait(ptr))
/*+ Try to wait for a semaphore (return 0 on success) +*/
#define __sem_trywait(ptr) (internal_sem_trywait(ptr))
/*+ Signal a semaphore +*/
#define __sem_signal(ptr) (internal_sem_post(ptr))
__END_DECLS
#endif