Re: How-to write soft real-time programs Kernel-2.6.x

[Chris Friesen <cfriesen@nortelnetworks.com>]

abhinav singh wrote:

> So how-to write a simple program(may be a Hello world
> program) which has real-time capabilities.


Something like the following will put you into one of the "realtime" 
scheduling classes, and you will take priority over the normally 
scheduled tasks.


struct sched_param p;
p.sched_priority=50;
if (sched_setscheduler(getpid(), SCHED_RR, &p) < 0) {
	perror("error while setting scheduler class");
	printf("continuing anyways, but results may not be as good\n");
}


The whole issue of soft-realtime is a complicated one, and there are 
many other things that should be done to maximise predictability.


Chris