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/*

 * Project: S.Ha.R.K.

 *

 * Coordinators:

 *   Giorgio Buttazzo    <giorgio@sssup.it>

 *   Paolo Gai           <pj@gandalf.sssup.it>

 *

 * Authors     :

 *   Paolo Gai           <pj@gandalf.sssup.it>

 *   (see the web pages for full authors list)

 *

 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)

 *

 * http://www.sssup.it

 * http://retis.sssup.it

 * http://shark.sssup.it

 */

/*

 * Copyright (C) 2000 Giorgio Buttazzo, Paolo Gai

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 *

 * CVS :        $Id: condtest.c,v 1.2 2004-04-17 11:36:13 giacomo Exp $

 This test verify the correctness of the condition variables.

 (... it doesn't test all...)

 The test uses 1 mutex

 the main task (NRT) creates three tasks.

 J0, J1, J3

   starts, lock the mutex, and wait on a condition variable

 J2

   at t = 0.5 lock the mutex and call cond_signal

   at t = 1   lock the mutex and call cond_signal

*/

#include "kernel/kern.h"

mutex_t  m0;

cond_t   c0;

int number = 0;

PID p0,p1,p2,p3;

TASK j0()

{

  cprintf("J0: before locking   m0\n");

  mutex_lock(&m0);

  cprintf("J0: locked           m0, waiting on c0, number =%d\n", number);

  while (!number) {

    cond_wait(&c0,&m0);

    cprintf("J0: number = %d, if >0 unlocking m0\n",number);

  }

  number--;

  mutex_unlock(&m0);

  cprintf("J0: unlocked         m0, end task\n");

  return 0;

}

TASK j1()

{

  cprintf("J1: before locking   m0\n");

  mutex_lock(&m0);

  cprintf("J1: locked           m0, waiting on c0, number =%d\n", number);

  while (!number) {

    cond_wait(&c0,&m0);

    cprintf("J1: number = %d, if >0 unlocking m0\n",number);

  }

  number--;

  mutex_unlock(&m0);

  cprintf("J1: unlocked         m0, end task\n");

  return 0;

}

TASK j2()

{

  cprintf("J2: started, waiting t=0.5 sec\n");

  while (sys_gettime(NULL) < 500000);

  cprintf("J2: before locking   m0\n");

  mutex_lock(&m0);

  cprintf("J2: locked           m0, number++ (was %d), cond_signal\n", number);

  number++;

  cond_signal(&c0);

  cprintf("J2: unlocking m0\n");

  mutex_unlock(&m0);

  cprintf("J2: waiting t=1 sec\n");

  while (sys_gettime(NULL) < 1000000);

  cprintf("J2: Killing J3\n");

  task_kill(p3);

  cprintf("J2: before locking   m0\n");

  mutex_lock(&m0);

  cprintf("J2: locked           m0, number++ (was %d), cond_signal\n", number);

  number++;

  cond_signal(&c0);

  cprintf("J2: unlocking m0\n");

  mutex_unlock(&m0);

  cprintf("J2: unlocked         m0, end task\n");

  return 0;

}

void cleanup_lock(void *arg)

{

  cprintf("J3: KILL!!!\n");

  mutex_unlock(&m0);

  cprintf("J3: unlocked m0 by the cleanup function\n");

}

TASK j3()

{

  cprintf("J3: before locking   m0\n");

  mutex_lock(&m0);

  cprintf("J3: locked           m0, waiting on c0, number =%d\n", number);

  task_cleanup_push(cleanup_lock, (void *)&m0);

  while (!number) {

    cond_wait(&c0,&m0);

    cprintf("J3: number = %d, if >0 unlocking m0\n",number);

  }

  task_cleanup_pop(0);

  // I hope this task never reach this point... it is killed by J2!!!

  number--;

  mutex_unlock(&m0);

  cprintf("J3: unlocked         m0, end task\n");

  return 0;

}

int main(int argc, char **argv)

{

  struct timespec t;

  NRT_TASK_MODEL m;

  PI_mutexattr_t a;

  /* ---------------------------------------------------------------------

     Task creation

     --------------------------------------------------------------------- */

  nrt_task_default_model(m);

  nrt_task_def_group(m,1);

  p0 = task_create("J0", j0, &m, NULL);

  if (p0 == NIL)

  { cprintf("Can't create J0 task...\n"); return 1; }

  p1 = task_create("J1", j1, &m, NULL);

  if (p1 == NIL)

  { cprintf("Can't create J1 task...\n"); return 1; }

  p2 = task_create("J2", j2, &m, NULL);

  if (p2 == NIL)

  { cprintf("Can't create J2 task...\n"); return 1; }

  p3 = task_create("J3", j3, &m, NULL);

  if (p3 == NIL)

  { cprintf("Can't create J3 task...\n"); return 1; }

  /* ---------------------------------------------------------------------

     Mutex creation

     --------------------------------------------------------------------- */

  PI_mutexattr_default(a);

  mutex_init(&m0,&a);

  cond_init(&c0);

  /* ---------------------------------------------------------------------

     Event post

     --------------------------------------------------------------------- */

  group_activate(1);

  do {

    sys_gettime(&t);

  } while (t.tv_sec < 10);

  sys_end();

  return 0;

}