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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
*/
/**
------------
CVS : $Id: ego.c,v 1.3 2003-01-07 17:10:15 pj Exp $
File: $File$
Revision: $Revision: 1.3 $
Last update: $Date: 2003-01-07 17:10:15 $
------------
**/
/*
* Copyright (C) 2000 Paolo Gai and Giorgio Buttazzo
*
* 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
*
*/
/****************************************************************/
/* PERIODIC PROCESS TEST */
/****************************************************************/
#include <kernel/kern.h>
#include <drivers/glib.h>
#include <drivers/keyb.h>
#include <semaphore.h>
#define X0 10
/* task periods */
#define PERIOD_T1 100000
#define PERIOD_T2 200000
#define PERIOD_T3 300000
/* X position of the text printed by each task */
int y
[3] = {100, 180, 260};
/* text printed by each task */
char talk
[3][50] = { "I am ego1 and I print a character every 100 ms",
"I am ego2 and I print a character every 200 ms",
"I am ego3 and I print a character every 300 ms"};
/* A semaphore used to access Video Cards in mutual exclusion */
sem_t mutex
;
/***************************************************************/
TASK ego
(void *arg
)
{
int i
= (int)arg
;
int leng
;
char s
[2];
int x
;
int j
= 0;
/* compute the length of the string to print */
leng
= 0;
while (talk
[i
][leng
] != 0) leng
++;
x
= X0
;
s
[1] = 0;
task_endcycle
();
while (1) {
s
[0] = talk
[i
][j
];
sem_wait
(&mutex
);
/* grx_text("TEST", 100,100,12,0); */
grx_text
(s
,x
,y
[i
],12+i
,0);
sem_post
(&mutex
);
x
+= 8;
if (++j
== leng
) {
j
= 0;
x
= X0
;
y
[i
] += 8;
if (y
[i
]>340) y
[i
]=100;
}
task_endcycle
();
}
}
/****************************************************************/
/* This function is called when Alt-X is pressed.
It simply shutdown the system using sys_end.
Note that the byebye() function is called only if we exit from
the system using sys_end()!!!!
*/
void my_end
(KEY_EVT
* e
)
{
sys_end
();
}
/******************************************************************/
/* This function is called when the system exit correctly after Alt-X.
It exits from the graphic mode and then it prints a small greeting.
Note that:
- The function calls grx_exit, so it must be registered using
RUNLEVEL_BEFORE_EXIT (RUNLEVEL_AFTER_EXIT does not work because
at that point the kernel is already returned in real mode!!!)
- When an exception is raised, the exception handler is called.
Since the exception handler already exits from the graphic mode,
this funcion has not to be called. For this reason:
. we registered byebye using the flag NO_AT_ABORT
. the exception handler exits using sys_abort; in that way byebye is
NOT called
*/
void byebye
(void *arg
)
{
grx_close
();
cprintf
("Bye Bye!\n");
}
/****************************** MAIN ******************************/
int main
(int argc
, char **argv
)
{
PID pid1
, pid2
, pid3
;
KEY_EVT emerg
;
HARD_TASK_MODEL m1
, m2
, m3
;
/* Set the closing function */
sys_atrunlevel
(byebye
, NULL
, RUNLEVEL_BEFORE_EXIT
);
/* Initializes the semaphore */
sem_init
(&mutex
,0,1);
/* graphic card Initialization */
if (grx_init
() < 1) {
sys_abort
(1);
}
if (grx_open
(640, 480, 8) < 0) {
cprintf
("GRX Err\n");
sys_abort
(1);
}
/* set the keyboard handler to exit correctly */
emerg.
ascii = 'x';
emerg.
scan = KEY_X
;
emerg.
flag = ALTL_BIT
;
keyb_hook
(emerg
,my_end
);
emerg.
ascii = 'x';
emerg.
scan = KEY_X
;
emerg.
flag = ALTR_BIT
;
keyb_hook
(emerg
,my_end
);
/* a small banner */
grx_text
("EGO Test",8,8,WHITE
,0);
grx_text
("Press Alt-X to exit",8,16,WHITE
,0);
/* ego1 creation */
hard_task_default_model
(m1
);
hard_task_def_ctrl_jet
(m1
);
hard_task_def_arg
(m1
, (void *)0);
hard_task_def_wcet
(m1
, 5000);
hard_task_def_mit
(m1
, PERIOD_T1
);
hard_task_def_group
(m1
,1);
pid1
= task_create
("ego1", ego
, &m1
, NULL
);
if (pid1
== NIL
) {
grx_close
();
perror("Could not create task <ego1>");
sys_abort
(1);
}
/* ego2 creation */
hard_task_default_model
(m2
);
hard_task_def_ctrl_jet
(m2
);
hard_task_def_arg
(m2
, (void *)1);
hard_task_def_wcet
(m2
, 5000);
hard_task_def_mit
(m2
, PERIOD_T2
);
hard_task_def_group
(m2
,1);
pid2
= task_create
("ego2", ego
, &m2
, NULL
);
if (pid2
== NIL
) {
grx_close
();
perror("Could not create task <ego2>");
sys_abort
(1);
}
/* ego3 creation */
hard_task_default_model
(m3
);
hard_task_def_ctrl_jet
(m3
);
hard_task_def_arg
(m3
, (void *)2);
hard_task_def_wcet
(m3
, 5000);
hard_task_def_mit
(m3
, PERIOD_T3
);
hard_task_def_group
(m3
,1);
pid3
= task_create
("ego3", ego
, &m3
, NULL
);
if (pid3
== NIL
) {
grx_close
();
perror("Could not create task <ego3>");
sys_abort
(1);
}
/* and finally we activate the three threads... */
group_activate
(1);
/*
now the task main ends, but the system does not shutdown because
there are the three task ego1, ego2, and ego3 running.
The demo will finish if a Alt-X key is pressed.
*/
return 0;
}
/****************************************************************/