Re: Two real time tasks?

I did use priorities, and I am not seeing preemption. I am calling 
pthread_setschedparam() at the beginning of the real time threads 
with sched_priority in the sched_param set to a higher number for the 
slower running test. Is this not the correct way to do it?

>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
>>  _______________________________________________
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>  > [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


-- 

---
Chris Smolinski
Black Cat Systems
http://www.blackcatsystems.com
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