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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 kernel
***************************************/
/*
* CVS : $Id: mutex.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) 1999,2000 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 _FS_MUTEX_H
#define _FS_MUTEX_H
/*
* standard mutex
*/
#include <kernel/int_sem.h>
/*+ a semaphore object +*/
typedef internal_sem_t __mutex_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 __mutex_init(ptr,attr) internal_sem_init((ptr),1)
/*+ Wait for a semaphore +*/
#define __mutex_lock(ptr) (internal_sem_wait(ptr))
/*+ Try to wait for a semaphore (return 0 on success) +*/
#define __mutex_trylock(ptr) (internal_sem_wait(ptr))
/*+ Signal a semaphore +*/
#define __mutex_unlock(ptr) (internal_sem_post(ptr))
#if 0
/* start old implementation */
#include <kernel/model.h>
#include <kernel/func.h>
#include <fs/assert.h>
/*+ a mutex object +*/
typedef mutex_t __mutex_t;
/*
The following macros require a pointer to a mutex object and
return nothing.
*/
/* Initialize a mutex object +*/
#define __mutex_init(ptr,attr) _assert(mutex_init(ptr,attr)==0)
/*+ Lock a mutex object +*/
#define __mutex_lock(ptr) _assert(mutex_lock(ptr)==0)
/*+ Try to lock a mutex (return 0 on success locking) +*/
#define __mutex_trylock(ptr) (mutex_trylock((ptr)))
/*+ Unlock a mutex +*/
#define __mutex_unlock(ptr) _assert(mutex_unlock(ptr)==0)
/* end old implementation */
#endif
/*
* fast mutex
*/
#include <kernel/func.h>
typedef SYS_FLAGS __fastmutex_t;
#define __fastmutex_init(ptr)
#define __fastmutex_lock(ptr) *ptr=kern_fsave()
#define __fastmutex_unlock(ptr) kern_frestore(*ptr)
#if 0
/* Hartik 3.x implemantation */
/*
#include <hartik/const.h>
typedef struct {
QUEUE queue;
int value;
} __mutex_t;
void __mutex_init(__mytex_t *);
void __mutex_lock(__mytex_t *);
int __mutex_trylock(__mytex_t *);
void __mutex_unlock(__mytex_t *);
*/
/*
* temporary hack
*/
#include <h/sys/kern.h>
#include <h/sys/const.h>
/*+ a mutex object +*/
typedef SEM __mutex_t;
/*
The following macros require a pointer to a mutex object and
return nothing.
*/
#ifdef FSCHECKMUTEX
#include <fs/assert.h>
#define checkmutex(x) assert((x)>=0&&(x)<MAX_SEM)
#else
#define checkmutex(x)
#endif
/* Initialize a mutex object +*/
#define __mutex_init(ptr) { *(ptr)=sem_create(1); checkmutex(*ptr); }
/*+ Lock a mutex object +*/
#define __mutex_lock(ptr) { checkmutex(*ptr); sem_wait(*(ptr),BLOCK); }
/*+ Try to lock a mutex (return 0 on success locking) +*/
#define __mutex_trylock(ptr) { checkmutex(*ptr); sem_wait(*(ptr),NON_BLOCK); }
/*+ Unlock a mutex +*/
#define __mutex_unlock(ptr) { checkmutex(*ptr); sem_signal(*(ptr)); }
#endif
#endif