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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 1.1.1.1 2002-03-29 14:12:51 pj Exp $
*
* File: $File$
* Revision: $Revision: 1.1.1.1 $
* Last update: $Date: 2002-03-29 14:12:51 $
*/
/*
* 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>
/*+ 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))
#if 0
/*
#include <hartik/const.h>
typedef struct {
QUEUE queue;
int value;
} __semaph_t;
void __semaph_init(__semaph_t *, int val);
void __semaph_lock(__semaph_t *);
int __semaph_trylock(__semaph_t *);
void __semaph_unlock(__semaph_t *);
*/
/*
* temporary hack
*/
#include <h/sys/kern.h>
#include <h/sys/const.h>
#ifdef FSCHECKSEMAPH
#include <fs/assert.h>
#define checksemaph(x) _assert((x)>=0&&(x)<MAX_SEM)
#else
#define checksemaph(x)
#endif
/*+ a semaphore object +*/
typedef SEM __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) {*(ptr)=sem_create(val); checksemaph(*ptr);}
/*+ Wait for a semaphore +*/
#define __sem_wait(ptr) {checksemaph(*ptr); sem_wait(*(ptr),BLOCK);}
/*+ Try to wait for a semaphore (return 0 on success) +*/
#define __sem_trywait(ptr) (!sem_wait(*(ptr),NON_BLOCK))
/*+ Signal a semaphore +*/
#define __sem_signal(ptr) {checksemaph(*ptr); sem_signal(*(ptr));}
#endif
#endif