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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 | Semaphores for the kernel |
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| 24 | |||
| 25 | ***************************************/ |
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| 26 | |||
| 27 | /* |
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| 28 | * CVS : $Id: semaph.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 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 _FS_SEMAPH_H |
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| 55 | #define _FS_SEMAPH_H |
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| 56 | |||
| 57 | #include <kernel/int_sem.h> |
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| 58 | |||
| 59 | /*+ a semaphore object +*/ |
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| 60 | typedef internal_sem_t __sem_t; |
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| 61 | |||
| 62 | /* |
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| 63 | The following macros can be used to synchronize events; all |
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| 64 | require a pointer to a semaphore object and return nothing; |
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| 65 | a semaphore can have "val" resource free. |
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| 66 | */ |
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| 67 | |||
| 68 | /*+ Initialize a semaphore (to integer val) +*/ |
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| 69 | #define __sem_init(ptr,val) internal_sem_init((ptr),(val)) |
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| 70 | |||
| 71 | /*+ Wait for a semaphore +*/ |
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| 72 | #define __sem_wait(ptr) (internal_sem_wait(ptr)) |
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| 73 | |||
| 74 | /*+ Try to wait for a semaphore (return 0 on success) +*/ |
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| 75 | #define __sem_trywait(ptr) (internal_sem_trywait(ptr)) |
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| 76 | |||
| 77 | /*+ Signal a semaphore +*/ |
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| 78 | #define __sem_signal(ptr) (internal_sem_post(ptr)) |
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| 79 | |||
| 80 | |||
| 81 | |||
| 82 | |||
| 83 | #if 0 |
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| 84 | |||
| 85 | /* |
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| 86 | #include <hartik/const.h> |
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| 87 | |||
| 88 | typedef struct { |
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| 89 | QUEUE queue; |
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| 90 | int value; |
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| 91 | } __semaph_t; |
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| 92 | |||
| 93 | void __semaph_init(__semaph_t *, int val); |
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| 94 | void __semaph_lock(__semaph_t *); |
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| 95 | int __semaph_trylock(__semaph_t *); |
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| 96 | void __semaph_unlock(__semaph_t *); |
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| 97 | */ |
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| 98 | |||
| 99 | /* |
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| 100 | * temporary hack |
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| 101 | */ |
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| 102 | |||
| 103 | #include <h/sys/kern.h> |
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| 104 | #include <h/sys/const.h> |
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| 105 | |||
| 106 | #ifdef FSCHECKSEMAPH |
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| 107 | #include <fs/assert.h> |
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| 108 | #define checksemaph(x) _assert((x)>=0&&(x)<MAX_SEM) |
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| 109 | #else |
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| 110 | #define checksemaph(x) |
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| 111 | #endif |
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| 112 | |||
| 113 | /*+ a semaphore object +*/ |
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| 114 | typedef SEM __sem_t; |
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| 115 | |||
| 116 | /* |
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| 117 | The following macros can be used to synchronize events; all |
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| 118 | require a pointer to a semaphore object and return nothing; |
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| 119 | a semaphore can have "val" resource free. |
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| 120 | */ |
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| 121 | |||
| 122 | /*+ Initialize a semaphore (to integer val) +*/ |
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| 123 | #define __sem_init(ptr,val) {*(ptr)=sem_create(val); checksemaph(*ptr);} |
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| 124 | |||
| 125 | /*+ Wait for a semaphore +*/ |
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| 126 | #define __sem_wait(ptr) {checksemaph(*ptr); sem_wait(*(ptr),BLOCK);} |
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| 127 | |||
| 128 | /*+ Try to wait for a semaphore (return 0 on success) +*/ |
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| 129 | #define __sem_trywait(ptr) (!sem_wait(*(ptr),NON_BLOCK)) |
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| 130 | |||
| 131 | /*+ Signal a semaphore +*/ |
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| 132 | #define __sem_signal(ptr) {checksemaph(*ptr); sem_signal(*(ptr));} |
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| 133 | |||
| 134 | #endif |
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| 135 | |||
| 136 | |||
| 137 | |||
| 138 | #endif |
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| 139 | |||
| 140 | |||
| 141 | |||
| 142 |