[Xenomai-help] High CPU Load

[Xenomai-help] High CPU Load

[Felipe Castro]

[-- Attachment #1: Type: text/plain, Size: 1939 bytes --]

Hi guys ...

I wrote a simple code just to learn how to deal with real time tasks, but
there is something wrong .....
the code is working , and my tasks running , but the processor load is to
high 98% ....

#include <stdio.h>
#include <sys/mman.h>
#include <native/task.h>
#include <native/timer.h>

void periodic_1(void *arg);
void periodic_refresh (void *arg);
void refreshScreen();

#define TASK_PRIORITY     99     //Priority
#define TASK_PRIORITY2     95     //Priority
#define TASK_MODE    0
#define TASK_STACKSIZE    0

#define TASK_PERIOD    10 * 1000000 //10ms
#define TASK_PERIOD2    1000 * 1000000 //5ms

RT_TASK td,task2;

void periodic_refresh (void *arg){
    unsigned long over;
    int err2 =
rt_task_set_periodic(NULL,TM_NOW,rt_timer_ns2ticks(TASK_PERIOD2));

    for(;;){
        err2 = rt_task_wait_period(&over);
        if(err2)break;

        }
}

void periodic_1(void *arg){

    unsigned long over1;
    int err1 =
rt_task_set_periodic(NULL,TM_NOW,rt_timer_ns2ticks(TASK_PERIOD));

        for(;;){
        err1 = rt_task_wait_period(&over1);
        if(err1)break;
    }
}

int main (int argc, char *argv[]){

    int err=0,err2=0;

    mlockall(MCL_CURRENT|MCL_FUTURE);

    err=rt_task_spawn(&td,
"serialRead",TASK_STACKSIZE,TASK_PRIORITY,TASK_MODE,&periodic_1,NULL);
    err2=rt_task_spawn(&task2,
"refresh",TASK_STACKSIZE,TASK_PRIORITY2,TASK_MODE,&periodic_refresh,NULL);

    if(!err && !err2){

                refreshScreen();
                for(;;){}
                rt_task_delete(&td);
                rt_task_delete(&task2);

    }

    return 0;
}


 void refreshScreen(void){

    system("reset");

printf("|---------------------------------------------------------------------------------------|\n");
    printf("| Xenomai
Task
|\n");

printf("|---------------------------------------------------------------------------------------|\n\n\n");
    printf("Press ctrl+c to finish ...\n");

 }

Thanks

[-- Attachment #2: Type: text/html, Size: 2427 bytes --]

Re: [Xenomai-help] High CPU Load

[Gilles Chanteperdrix]

Felipe Castro wrote:
> Hi guys ...
> 
> I wrote a simple code just to learn how to deal with real time tasks, but
> there is something wrong .....
> the code is working , and my tasks running , but the processor load is to
> high 98% ....


>                 for(;;){}
That's why.


-- 
					    Gilles.

Re: [Xenomai-help] High CPU Load

[Felipe Castro]

[-- Attachment #1: Type: text/plain, Size: 651 bytes --]

Well , that is what i thought but i need to stop the software otherwise my
tasks will be deleted .... That's the why i put this infinite loop .... how
can i do to keep my tasks running ?

On Fri, Sep 25, 2009 at 4:36 PM, Gilles Chanteperdrix <
gilles.chanteperdrix@xenomai.org> wrote:

> Felipe Castro wrote:
> > Hi guys ...
> >
> > I wrote a simple code just to learn how to deal with real time tasks, but
> > there is something wrong .....
> > the code is working , and my tasks running , but the processor load is to
> > high 98% ....
>
>
> >                 for(;;){}
> That's why.
>
>
> --
>                                             Gilles.
>

[-- Attachment #2: Type: text/html, Size: 1061 bytes --]

Re: [Xenomai-help] High CPU Load

[Gilles Chanteperdrix]

Felipe Castro wrote:
> Well , that is what i thought but i need to stop the software otherwise my
> tasks will be deleted .... That's the why i put this infinite loop .... how
> can i do to keep my tasks running ?

	for(;;)
		pause();

For instance. Or:

	while (!finished)
		pause();

finished being a variable set to a non zero value by some signal handler.

-- 
					    Gilles.

Re: [Xenomai-help] High CPU Load

[Wolfgang Grandegger]

Felipe Castro wrote:
> Well , that is what i thought but i need to stop the software otherwise my
> tasks will be deleted .... That's the why i put this infinite loop .... how
> can i do to keep my tasks running ?

Have a look to the example programs, e.g.:

http://www.rts.uni-hannover.de/xenomai/lxr/source/examples/native/trivial-periodic.c#069

Wolfgang.