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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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 Semaphores for the kernel
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***************************************/
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/*
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 * CVS :        $Id: semaph.h,v 1.2 2003-03-13 13:37:58 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 13:37:58 $
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 */
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/*
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 * Copyright (C) 1999 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 _FS_SEMAPH_H
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#define _FS_SEMAPH_H
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#include <kernel/int_sem.h>
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#include "ll/sys/cdefs.h"
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__BEGIN_DECLS
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/*+ a semaphore object +*/
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typedef internal_sem_t __sem_t;
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/*
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  The following macros can be used to synchronize events; all
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  require a pointer to a semaphore object and return nothing;
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  a semaphore can have "val" resource free.
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 */
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/*+ Initialize a semaphore (to integer val) +*/
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#define __sem_init(ptr,val) internal_sem_init((ptr),(val))
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/*+ Wait for a semaphore +*/
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#define __sem_wait(ptr)     (internal_sem_wait(ptr))
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/*+ Try to wait for a semaphore (return 0 on success) +*/
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#define __sem_trywait(ptr)  (internal_sem_trywait(ptr))
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/*+ Signal a semaphore +*/
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#define __sem_signal(ptr)   (internal_sem_post(ptr))
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#if 0
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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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} __semaph_t;
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void __semaph_init(__semaph_t *, int val);
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void __semaph_lock(__semaph_t *);
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int  __semaph_trylock(__semaph_t *);
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void __semaph_unlock(__semaph_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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#ifdef FSCHECKSEMAPH
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#include <fs/assert.h>
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#define checksemaph(x) _assert((x)>=0&&(x)<MAX_SEM)
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#else
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#define checksemaph(x)
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#endif
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/*+ a semaphore object +*/
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typedef SEM __sem_t;
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/*
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  The following macros can be used to synchronize events; all
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  require a pointer to a semaphore object and return nothing;
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  a semaphore can have "val" resource free.
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 */
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/*+ Initialize a semaphore (to integer val) +*/
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#define __sem_init(ptr,val) {*(ptr)=sem_create(val); checksemaph(*ptr);}
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/*+ Wait for a semaphore +*/
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#define __sem_wait(ptr)     {checksemaph(*ptr); sem_wait(*(ptr),BLOCK);}
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/*+ Try to wait for a semaphore (return 0 on success) +*/
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#define __sem_trywait(ptr)  (!sem_wait(*(ptr),NON_BLOCK))
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/*+ Signal a semaphore +*/
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#define __sem_signal(ptr)   {checksemaph(*ptr); sem_signal(*(ptr));}
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#endif
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__END_DECLS
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#endif
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