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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 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: pcdemo.c,v 1.4 2005-01-08 14:31:38 pj Exp $

 This test verify the correctness of the PC module.

 The test uses 3 mutexes

 m0 with ceiling 0

 m1 with ceiling 0

 m2 with ceiling 1

 the main task (NRT) creates three tasks.

 J0 with PC priority 0

   starts at t=1.5 sec and lock m0, unlock m0, then lock and unlock m1

 J1 with PC priority 1

   starts at t=0.5 sec and try to lock m2

 J2 with PC priority 2

   it starts and locks m2

   at t=1 sec it locks m1

   at t=1.5 sec it unlocks m1

 The example is similar to the scheduling diagram shown at p. 197 of the

 book "Sistemi in tempo Reale", by Giorgio Buttazzo, Pitagora Editrice

*/

#include "kernel/kern.h"

mutex_t  m0,m1,m2;

void startJ(void *a)

{

  task_activate((PID)a);

}

TASK J0()

{

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

  mutex_lock(&m0);

  cprintf("J0: locked           m0\n");

  mutex_unlock(&m0);

  cprintf("J0: unlocked         m0, locking m1\n");

  mutex_lock(&m1);

  cprintf("J0: locked           m1\n");

  mutex_unlock(&m1);

  cprintf("J0: unlocked         m1, end task\n");

  return 0;

}

TASK J1()

{

  cprintf("J1: before locking   m2\n");

  mutex_lock(&m2);

  cprintf("J1: locked           m2\n");

  mutex_unlock(&m2);

  cprintf("J1: unlocked         m2, end task\n");

  return 0;

}

TASK j2()

{

  cprintf("J2: before locking   m2\n");

  mutex_lock(&m2);

  cprintf("J2: locked           m2, waiting to t=1 sec\n");

  while (sys_gettime(NULL) < 1000000);

  cprintf("J2: t = 1 sec reached\n");

  mutex_lock(&m1);

  cprintf("J2: locked           m1, waiting to t=2 sec\n");

  while (sys_gettime(NULL) < 2000000);

  cprintf("J2: t = 2 sec reached\n");

  mutex_unlock(&m1);

  cprintf("J2: unlocked         m1\n");

  mutex_unlock(&m2);

  cprintf("J2: unlocked         m2, end task\n");

  return 0;

}

int main(int argc, char **argv)

{

  struct timespec t;

  HARD_TASK_MODEL m;

  PID      p0,p1,p2;

  PC_mutexattr_t a;

  PI_mutexattr_t a2;

  PC_RES_MODEL r;

  clear();

  cprintf("Priority Ceiling demo. It ends after 60 sec\n");

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

     Task creation

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

  hard_task_default_model(m);

  hard_task_def_mit(m, 1000000);

  hard_task_def_wcet(m, 20000);

  PC_res_default_model(r,0);

  p0 = task_create("J0", J0, &m, &r);

  if (p0 == NIL)

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

  hard_task_default_model(m);

  hard_task_def_mit(m, 2100000);

  hard_task_def_wcet(m, 20000);

  PC_res_default_model(r,1);

  p1 = task_create("J1", J1, &m, &r);

  if (p1 == NIL)

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

  hard_task_default_model(m);

  hard_task_def_mit(m, 10000000);

  hard_task_def_wcet(m, 3000000);

  PC_res_default_model(r,2);

  p2 = task_create("J2", j2, &m, &r);

  if (p2 == NIL)

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

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

     Mutex creation

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

  PI_mutexattr_default(a2);

  PC_mutexattr_default(a,0);

  mutex_init(&m0,(mutexattr_t *)&a);

  mutex_init(&m1,(mutexattr_t *)&a);

  PC_mutexattr_default(a,1);

  mutex_init(&m2,(mutexattr_t *)&a);

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

     Event post

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

  t.tv_sec = 0;

  t.tv_nsec = 500000000;

  kern_cli();

  kern_event_post(&t,startJ,(void *)p1);

  t.tv_sec = 1;

  kern_event_post(&t,startJ,(void *)p0);

  kern_sti();

  task_activate(p2);

  do {

    sys_gettime(&t);

  } while (t.tv_sec < 10);

  exit(0);

  return 0;

}