> Venkata Rajesh Velamakanni wrote:
>
> Hello All,
>
> I have a query in setting thread priorities using SCHED_RR
> and pthread_attr_setschedparam. Can any one please answer
> my queries.
>
> I have created a thread (thread1)by setting SCHED_RR as scheduling
> policy
> and priority as 1. Then I created another thread (thread2) with the
> same
> scheduling policy but with higher priority. My thread2 never got
> chance to
> execute until my thread1 is exited.
I don't think this is what happened. What priority is the main at? I
think it got locked out by your thread 1 and did not even create thread
2 until thread 1 exited.
>
> From this I understood that there are two bugs, which need to be
> fixed.
> Could you please clarify whether following are bugs or not. Or Am I
> missing
> something?
>
> 1. First one is with priority, though my second thread is of high
> priority it
> never got chance until my thread1 is exited.
> 2. Second one is with scheduling policy, though I am using SCHED_RR,
> my second thread did not get the time slice.
>
I am not sure what you want here, but SCHED_RR slices within a given
priority level. A priority 5 thread will not be SCHED_RRed out in favor
of a priority 4 thread _EVER_. See man pages on this.
Yes there are problem with the scheduler, but I don't think you have hit
them, yet :)
George
ps, there is a real time scheduler with some sample programs at
www.mvista.com
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