RE: How do I make app RT?

[Wiedenheft David-C. <D.W...@mo...>]

The app is probably locking up because your program is running at a higher priority than the console.

The console is invoked in the /etc/rc.d/init.d/xinetd file.  Specifically the line "daemon xinetd -...

Or else run your program at a lower priority.

There might be another way, but I am not sure.

-dave




-----Original Message-----
From: Mark Hounschell [mailto:dm...@cf...]
Sent: Friday, November 02, 2001 12:22 PM
To: rtsched
Subject: Re: How do I make app RT?


Mark Hounschell wrote:
> 
> How do I make an app real-time so that the rtsched will schedule it as
> real-time?
> 
> Thanks in advance

Well, I think I figured out how. I have to use the sched_setscheduler call,
right?
I've pasted the little test pgm below. It just locks the system up. Could anyone
please
help me out here. What do I have to do to use this schedular with a real-time
task????
Is there anyone on this list?????



#include <stdio.h>
#include <sched.h>

main()
{
        int my_priority = 120;
        int value;


        /* define a structure to use for call */
        struct sched_param my_sched, *pmy_sched;

        /* set our pointer to point to our structure */
        pmy_sched = &my_sched;

        /* Set the priority to what we want in the structure */
        my_sched.sched_priority = my_priority;

        /* see what the priority of our task is currently */
        value = sched_getscheduler(0);
        printf("sched.c:Current task priority is %d\n", value);

        /* Now we make the OS call */
        value = sched_setscheduler(0, SCHED_FIFO, pmy_sched);

        /* check the return value for success */
        if(value == -1)
        {
                printf("sched.c:sched_setscheduler returned error:%d\n", value);
        }
        else
        {
                printf("sched.c:sched_setscheduler set to priority %d\n",
                        my_priority);
        }
        while (my_priority > 0);
        {
        value = sched_getscheduler(0);
        printf("sched.c:Current task priority is %d\n", value);
        }
}

Ragards
--
Mark Hounschell
dm...@cf...

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