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| 1120 | 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 | * (see the web pages for full authors list) |
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| 11 | * |
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| 12 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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| 13 | * |
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| 14 | * http://www.sssup.it |
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| 15 | * http://retis.sssup.it |
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| 16 | * http://shark.sssup.it |
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| 17 | */ |
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| 18 | |||
| 19 | /* |
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| 20 | * Copyright (C) 2000 Paolo Gai |
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| 21 | * |
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| 22 | * This program is free software; you can redistribute it and/or modify |
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| 23 | * it under the terms of the GNU General Public License as published by |
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| 24 | * the Free Software Foundation; either version 2 of the License, or |
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| 25 | * (at your option) any later version. |
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| 26 | * |
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| 27 | * This program is distributed in the hope that it will be useful, |
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| 28 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 29 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 30 | * GNU General Public License for more details. |
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| 31 | * |
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| 32 | * You should have received a copy of the GNU General Public License |
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| 33 | * along with this program; if not, write to the Free Software |
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| 34 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 35 | * |
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| 36 | * |
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| 37 | * CVS : $Id: semdemo.c,v 1.1 2002-11-11 08:22:46 pj Exp $ |
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| 38 | |||
| 39 | This is a really simple semaphore demo. |
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| 40 | |||
| 41 | */ |
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| 42 | |||
| 43 | #include "kernel/kern.h" |
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| 44 | |||
| 45 | #include "semaphore.h" |
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| 46 | |||
| 47 | sem_t s; |
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| 48 | |||
| 49 | void *goofy(void *a) |
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| 50 | { |
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| 51 | struct timespec t; |
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| 52 | char *n = proc_table[exec_shadow].name; |
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| 53 | |||
| 54 | cprintf("Task %s: Locking semaphore...\n", n); |
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| 55 | |||
| 56 | sem_wait(&s); |
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| 57 | cprintf("Task %s: Semaphore locked...\n", n); |
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| 58 | |||
| 59 | do { |
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| 60 | sys_gettime(&t); |
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| 61 | } while (t.tv_sec < (int)a); |
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| 62 | |||
| 63 | cprintf("Task %s: Unlocking semaphore...\n", n); |
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| 64 | |||
| 65 | sem_post(&s); |
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| 66 | |||
| 67 | cprintf("Task %s: Semaphore unlocked...\n", n); |
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| 68 | |||
| 69 | return 0; |
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| 70 | } |
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| 71 | |||
| 72 | int main(int argc, char **argv) |
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| 73 | { |
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| 74 | NRT_TASK_MODEL m; |
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| 75 | PID p2,p3; |
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| 76 | |||
| 77 | nrt_task_default_model(m); |
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| 78 | nrt_task_def_group(m,1); |
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| 79 | |||
| 80 | nrt_task_def_arg(m,(void *)1); |
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| 81 | p2 = task_create("goofy1", goofy, &m, NULL); |
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| 82 | if (p2 == NIL) |
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| 83 | { cprintf("Can't create goofy1 task...\n"); return 1; } |
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| 84 | |||
| 85 | nrt_task_def_arg(m,(void *)2); |
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| 86 | p3 = task_create("goofy2", goofy, &m, NULL); |
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| 87 | if (p3 == NIL) |
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| 88 | { cprintf("Can't create goofy2 task...\n"); return 1; } |
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| 89 | |||
| 90 | cprintf("Initializing semaphore...\n"); |
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| 91 | |||
| 92 | sem_init(&s,0,1); |
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| 93 | |||
| 94 | group_activate(1); |
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| 95 | |||
| 96 | return 0; |
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| 97 | } |