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| 2 | pj | 1 | /* |
| 2 | * Project: S.Ha.R.K. |
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| 3 | * |
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| 4 | * Coordinators: |
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| 5 | * Giorgio Buttazzo <giorgio@sssup.it> |
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| 6 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 7 | * |
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| 8 | * Authors : |
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| 9 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 10 | * Massimiliano Giorgi <massy@gandalf.sssup.it> |
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| 11 | * Luca Abeni <luca@gandalf.sssup.it> |
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| 12 | * (see the web pages for full authors list) |
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| 13 | * |
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| 14 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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| 15 | * |
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| 16 | * http://www.sssup.it |
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| 17 | * http://retis.sssup.it |
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| 18 | * http://shark.sssup.it |
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| 19 | */ |
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| 20 | |||
| 21 | /*************************************** |
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| 22 | |||
| 23 | Mutexs for the user. |
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| 24 | |||
| 25 | ***************************************/ |
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| 26 | |||
| 27 | /* |
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| 28 | * CVS : $Id: mutex.h,v 1.1.1.1 2002-03-29 14:12:51 pj Exp $ |
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| 29 | * |
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| 30 | * File: $File$ |
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| 31 | * Revision: $Revision: 1.1.1.1 $ |
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| 32 | * Last update: $Date: 2002-03-29 14:12:51 $ |
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| 33 | */ |
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| 34 | |||
| 35 | /* |
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| 36 | * Copyright (C) 1999,2000 Massimiliano Giorgi |
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| 37 | * |
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| 38 | * This program is free software; you can redistribute it and/or modify |
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| 39 | * it under the terms of the GNU General Public License as published by |
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| 40 | * the Free Software Foundation; either version 2 of the License, or |
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| 41 | * (at your option) any later version. |
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| 42 | * |
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| 43 | * This program is distributed in the hope that it will be useful, |
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| 44 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 45 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 46 | * GNU General Public License for more details. |
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| 47 | * |
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| 48 | * You should have received a copy of the GNU General Public License |
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| 49 | * along with this program; if not, write to the Free Software |
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| 50 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 51 | * |
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| 52 | */ |
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| 53 | |||
| 54 | #ifndef _MUTEX_H |
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| 55 | #define _MUTEX_H |
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| 56 | |||
| 57 | /* |
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| 58 | #include <hartik/const.h> |
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| 59 | |||
| 60 | typedef struct { |
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| 61 | QUEUE queue; |
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| 62 | int value; |
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| 63 | } mutex_t; |
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| 64 | |||
| 65 | void mutex_init(mutex_t *); |
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| 66 | void mutex_lock(mutex_t *); |
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| 67 | int mutex_trylock(mutex_t *); |
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| 68 | void mutex_unlock(mutex_t *); |
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| 69 | */ |
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| 70 | |||
| 71 | /* |
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| 72 | * temporary hack |
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| 73 | */ |
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| 74 | |||
| 75 | #include <h/sys/kern.h> |
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| 76 | #include <h/sys/const.h> |
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| 77 | |||
| 78 | /*+ a mutex object +*/ |
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| 79 | typedef SEM mutex_t; |
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| 80 | |||
| 81 | /* |
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| 82 | The following macros require a pointer to a mutex object and |
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| 83 | return nothing. |
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| 84 | */ |
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| 85 | |||
| 86 | /* Initialize a mutex object +*/ |
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| 87 | #define mutex_init(ptr) { *(ptr)=sem_create(1); } |
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| 88 | |||
| 89 | /*+ Lock a mutex object +*/ |
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| 90 | #define mutex_lock(ptr) { sem_wait(*(ptr),BLOCK); } |
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| 91 | |||
| 92 | /*+ Try to lock a mutex (return 0 on success locking) +*/ |
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| 93 | #define mutex_trylock(ptr) { sem_wait(*(ptr),NON_BLOCK); } |
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| 94 | |||
| 95 | /*+ Unlock a mutex +*/ |
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| 96 | #define mutex_unlock(ptr) { sem_signal(*(ptr)); } |
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| 97 | |||
| 98 | #endif |
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| 99 |