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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 1.3 2005-01-08 14:31:38 pj 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);
exit(1);
return 0;
}