WebSVN - shark - Blame - Rev 80 - /shark/trunk/include/fs/mutex.h

Rev	Author	Line No.	Line
2	pj	1	/*
		2	* Project: S.Ha.R.K.
		3	*
		4	* Coordinators:
		5	* Giorgio Buttazzo <giorgio@sssup.it>
		6	* Paolo Gai <pj@gandalf.sssup.it>
		7	*
		8	* Authors :
		9	* Paolo Gai <pj@gandalf.sssup.it>
		10	* Massimiliano Giorgi <massy@gandalf.sssup.it>
		11	* Luca Abeni <luca@gandalf.sssup.it>
		12	* (see the web pages for full authors list)
		13	*
		14	* ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
		15	*
		16	* http://www.sssup.it
		17	* http://retis.sssup.it
		18	* http://shark.sssup.it
		19	*/
		20
		21	/***************************************
		22
		23	Mutexs for the kernel
		24
		25	***************************************/
		26
		27	/*
80	pj	28	* CVS : $Id: mutex.h,v 1.2 2003-03-13 13:37:58 pj Exp $
2	pj	29	*
		30	* File: $File$
80	pj	31	* Revision: $Revision: 1.2 $
		32	* Last update: $Date: 2003-03-13 13:37:58 $
2	pj	33	*/
		34
		35	/*
		36	* Copyright (C) 1999,2000 Massimiliano Giorgi
		37	*
		38	* This program is free software; you can redistribute it and/or modify
		39	* it under the terms of the GNU General Public License as published by
		40	* the Free Software Foundation; either version 2 of the License, or
		41	* (at your option) any later version.
		42	*
		43	* This program is distributed in the hope that it will be useful,
		44	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		45	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		46	* GNU General Public License for more details.
		47	*
		48	* You should have received a copy of the GNU General Public License
		49	* along with this program; if not, write to the Free Software
		50	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		51	*
		52	*/
		53
		54	#ifndef _FS_MUTEX_H
		55	#define _FS_MUTEX_H
		56
		57	/*
		58	* standard mutex
		59	*/
		60
		61	#include <kernel/int_sem.h>
80	pj	62	#include "ll/sys/cdefs.h"
2	pj	63
80	pj	64	__BEGIN_DECLS
		65
2	pj	66	/+ a semaphore object +/
		67	typedef internal_sem_t __mutex_t;
		68
		69	/*
		70	The following macros can be used to synchronize events; all
		71	require a pointer to a semaphore object and return nothing;
		72	a semaphore can have "val" resource free.
		73	*/
		74
		75	/+ Initialize a semaphore (to integer val) +/
		76	#define __mutex_init(ptr,attr) internal_sem_init((ptr),1)
		77
		78	/+ Wait for a semaphore +/
		79	#define __mutex_lock(ptr) (internal_sem_wait(ptr))
		80
		81	/+ Try to wait for a semaphore (return 0 on success) +/
		82	#define __mutex_trylock(ptr) (internal_sem_wait(ptr))
		83
		84	/+ Signal a semaphore +/
		85	#define __mutex_unlock(ptr) (internal_sem_post(ptr))
		86
		87	#if 0
		88	/* start old implementation */
		89
		90	#include <kernel/model.h>
		91	#include <kernel/func.h>
		92	#include <fs/assert.h>
		93
		94	/+ a mutex object +/
		95	typedef mutex_t __mutex_t;
		96
		97	/*
		98	The following macros require a pointer to a mutex object and
		99	return nothing.
		100	*/
		101
		102	/* Initialize a mutex object +*/
		103	#define __mutex_init(ptr,attr) _assert(mutex_init(ptr,attr)==0)
		104	/+ Lock a mutex object +/
		105	#define __mutex_lock(ptr) _assert(mutex_lock(ptr)==0)
		106	/+ Try to lock a mutex (return 0 on success locking) +/
		107	#define __mutex_trylock(ptr) (mutex_trylock((ptr)))
		108	/+ Unlock a mutex +/
		109	#define __mutex_unlock(ptr) _assert(mutex_unlock(ptr)==0)
		110
		111	/* end old implementation */
		112	#endif
		113
		114	/*
		115	* fast mutex
		116	*/
		117
		118	#include <kernel/func.h>
		119
		120	typedef SYS_FLAGS __fastmutex_t;
		121
		122	#define __fastmutex_init(ptr)
		123	#define __fastmutex_lock(ptr) *ptr=kern_fsave()
		124	#define __fastmutex_unlock(ptr) kern_frestore(*ptr)
		125
		126	#if 0
		127
		128	/* Hartik 3.x implemantation */
		129
		130	/*
		131	#include <hartik/const.h>
		132
		133	typedef struct {
		134	QUEUE queue;
		135	int value;
		136	} __mutex_t;
		137
		138	void __mutex_init(__mytex_t *);
		139	void __mutex_lock(__mytex_t *);
		140	int __mutex_trylock(__mytex_t *);
		141	void __mutex_unlock(__mytex_t *);
		142	*/
		143
		144	/*
		145	* temporary hack
		146	*/
		147
		148	#include <h/sys/kern.h>
		149	#include <h/sys/const.h>
		150
		151	/+ a mutex object +/
		152	typedef SEM __mutex_t;
		153
		154	/*
		155	The following macros require a pointer to a mutex object and
		156	return nothing.
		157	*/
		158
		159	#ifdef FSCHECKMUTEX
		160	#include <fs/assert.h>
		161	#define checkmutex(x) assert((x)>=0&&(x)<MAX_SEM)
		162	#else
		163	#define checkmutex(x)
		164	#endif
		165
		166	/* Initialize a mutex object +*/
		167	#define __mutex_init(ptr) { (ptr)=sem_create(1); checkmutex(ptr); }
		168
		169	/+ Lock a mutex object +/
		170	#define __mutex_lock(ptr) { checkmutex(ptr); sem_wait((ptr),BLOCK); }
		171
		172	/+ Try to lock a mutex (return 0 on success locking) +/
		173	#define __mutex_trylock(ptr) { checkmutex(ptr); sem_wait((ptr),NON_BLOCK); }
		174
		175	/+ Unlock a mutex +/
		176	#define __mutex_unlock(ptr) { checkmutex(ptr); sem_signal((ptr)); }
		177
		178	#endif
		179
		180
		181
		182
		183
80	pj	184	__END_DECLS
2	pj	185	#endif
		186

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(root)/shark/trunk/include/fs/mutex.h - Rev 80