Re: Two real time tasks?

Use priorities so that the faster task can preempt.

On Thu, Feb 10, 2005 at 01:47:40PM -0500, Chris Smolinski wrote:
> I have a question concerning running two real time tasks at once. 
> I've created two such tasks, one running every 250 microseconds, and 
> one every 10 millieconds. For testing purposes, I have each test turn 
> a parallel port line on when the task starts to run, and off just 
> before it goes back to sleep. Viewing the two outputs on a scope, 
> everything looks fine.
> 
> But, if the slower task takes longer than 250 microseconds to run 
> (actually the problem happens before then), it is not pre-empted to 
> allow the faster task to run. Instead, once it is done, the faster 
> task runs, and then the next instance of the faster task runs 
> earlier, presumably so that the average execution rate remains 250 
> microseconds.
> 
> Is there anything I can do to have execution of the slower task 
> halted to allow the faster task to run at the correct time, and then 
> return to the slower task when the faster task is finished?
> 
> -- 
> 
> ---
> Chris Smolinski
> Black Cat Systems
> http://www.blackcatsystems.com
> _______________________________________________
> Rtl mailing list
> [email protected]
> http://www2.fsmlabs.com/mailman/listinfo/rtl

-- 
---------------------------------------------------------
Victor Yodaiken 
Finite State Machine Labs: The RTLinux Company.
www.fsmlabs.com  www.rtlinux.com
1+ 505 838 9109

_______________________________________________
Rtl mailing list
[email protected]
http://www2.fsmlabs.com/mailman/listinfo/rtl