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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 | |||
| 22 | /** |
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| 23 | ------------ |
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| 24 | CVS : $Id: sem.h,v 1.1.1.1 2002-03-29 14:12:51 pj Exp $ |
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| 25 | |||
| 26 | File: $File$ |
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| 27 | Revision: $Revision: 1.1.1.1 $ |
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| 28 | Last update: $Date: 2002-03-29 14:12:51 $ |
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| 29 | ------------ |
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| 30 | |||
| 31 | This file contains the semaphoric primitives |
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| 32 | |||
| 33 | Title: |
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| 34 | HARTSEM (Hartik Semaphores) |
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| 35 | |||
| 36 | Resource Models Accepted: |
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| 37 | None |
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| 38 | |||
| 39 | Description: |
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| 40 | This module contains a semaphore library compatible with Posix, Plus |
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| 41 | an extension to permit post and wait with counters > 1 |
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| 42 | |||
| 43 | Exceptions raised: |
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| 44 | None |
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| 45 | |||
| 46 | Restrictions & special features: |
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| 47 | - a function isBlocked is provided |
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| 48 | - the named semaphores are NOT implemented with a filesystem |
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| 49 | - the system supports up to _POSIX_SEM_NSEMS_MAX defined in limits.h |
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| 50 | |||
| 51 | **/ |
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| 52 | |||
| 53 | /* |
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| 54 | * Copyright (C) 2000 Paolo Gai |
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| 55 | * |
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| 56 | * This program is free software; you can redistribute it and/or modify |
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| 57 | * it under the terms of the GNU General Public License as published by |
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| 58 | * the Free Software Foundation; either version 2 of the License, or |
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| 59 | * (at your option) any later version. |
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| 60 | * |
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| 61 | * This program is distributed in the hope that it will be useful, |
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| 62 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 63 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 64 | * GNU General Public License for more details. |
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| 65 | * |
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| 66 | * You should have received a copy of the GNU General Public License |
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| 67 | * along with this program; if not, write to the Free Software |
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| 68 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 69 | * |
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| 70 | */ |
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| 71 | |||
| 72 | #ifndef __MODULES_SEM_H__ |
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| 73 | #define __MODULES_SEM_H__ |
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| 74 | |||
| 75 | #include <kernel/types.h> |
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| 76 | |||
| 77 | #define SEM_FAILED NULL |
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| 78 | typedef int sem_t; |
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| 79 | |||
| 80 | /*+ This function must be inserted in the __hartik_register_levels__ +*/ |
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| 81 | void SEM_register_module(void); |
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| 82 | |||
| 83 | int sem_close(sem_t *sem); |
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| 84 | int sem_destroy(sem_t *sem); |
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| 85 | int sem_getvalue(sem_t *sem, int *sval); |
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| 86 | int sem_init(sem_t *sem, int pshared, unsigned int value); |
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| 87 | sem_t *sem_open(const char *name, int oflag, ...); |
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| 88 | int sem_post(sem_t *sem); |
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| 89 | int sem_trywait(sem_t *sem); |
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| 90 | int sem_unlink(const char *name); |
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| 91 | int sem_wait(sem_t *sem); |
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| 92 | |||
| 93 | |||
| 94 | |||
| 95 | int sem_xpost(sem_t *sem, int n); |
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| 96 | int sem_xwait(sem_t *sem, int n, int wait); |
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| 97 | |||
| 98 | |||
| 99 | int isBlocked(PID i); |
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| 100 | |||
| 101 | #endif |