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1120 pj 1
/*
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 * Project: S.Ha.R.K.
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 *
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 * Coordinators:
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 *   Giorgio Buttazzo    <giorgio@sssup.it>
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 *   Paolo Gai           <pj@gandalf.sssup.it>
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 *
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 * Authors     :
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 *   Paolo Gai           <pj@gandalf.sssup.it>
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 *   (see the web pages for full authors list)
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 *
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 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
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 *
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 * http://www.sssup.it
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 * http://retis.sssup.it
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 * http://shark.sssup.it
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 */
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/*
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 * Copyright (C) 2000 Paolo Gai
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 *
1377 giacomo 37
 * CVS :        $Id: semdemo.c,v 1.2 2004-04-17 11:36:15 giacomo Exp $
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 This is a really simple semaphore demo.
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*/
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#include "kernel/kern.h"
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#include "semaphore.h"
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sem_t s;
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void *goofy(void *a)
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{
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  struct timespec t;
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  char *n = proc_table[exec_shadow].name;
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  cprintf("Task %s: Locking semaphore...\n", n);
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  sem_wait(&s);
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  cprintf("Task %s: Semaphore locked...\n", n);
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  do {
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    sys_gettime(&t);
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  } while (t.tv_sec < (int)a);
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  cprintf("Task %s: Unlocking semaphore...\n", n);
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  sem_post(&s);
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  cprintf("Task %s: Semaphore unlocked...\n", n);
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  return 0;
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}
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int main(int argc, char **argv)
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{
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  NRT_TASK_MODEL m;
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  PID p2,p3;
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  struct timespec t;
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  nrt_task_default_model(m);
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  nrt_task_def_group(m,1);
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  nrt_task_def_arg(m,(void *)1);
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  p2 = task_create("goofy1", goofy, &m, NULL);
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  if (p2 == NIL)
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  { cprintf("Can't create goofy1 task...\n"); return 1; }
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  nrt_task_def_arg(m,(void *)2);
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  p3 = task_create("goofy2", goofy, &m, NULL);
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  if (p3 == NIL)
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  { cprintf("Can't create goofy2 task...\n"); return 1; }
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  cprintf("Initializing semaphore...\n");
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  sem_init(&s,0,1);
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  group_activate(1);
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  do {
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    sys_gettime(&t);
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  } while (t.tv_sec < 10);
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  sys_end();
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  return 0;
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}