2008-03-12 13:16:31 Priorities

Linux Newbie (INDIA)

Message: 52398

Hi,

Please clarify me the followin doubts.

1. Is current kernel pre-emtive? If not do I need to appliy any patch to make it pre-emtive

2. In my user application, I am using pthreads. For pthreads, following options are configurable during thread creation i.e. RoundRobin, FIFO & others.

If I want to have pthreads implemented as pre-emtive scheduling, how to do that?

Is it enough If I use threads with different priorities?

Or is there anyother patch avaliabe?

Thanks in Advance!!!

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2008-03-12 14:07:34 Re: Priorities

Mike Frysinger (UNITED STATES)

Message: 52400 only non-preempt and voluntary preempt is supported at the moment ... full preempt is not supported at the moment ... but preempt really doesnt affect inter-thread scheduling. all thread scheduling is handled in userspace and acts according to the sched funcs you've called.

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2008-03-13 15:23:40 Re: Priorities

Linux Newbie (INDIA)

Message: 52475

"only non-preempt and voluntary preempt is supported at the moment ... full preempt is not supported at the moment ..."

you mean the above statement in terms of kernel space rite? is it possible to configure non-preempt or voluntary preempt? if yes in which file?

So in userspace, if I use pthreads, then whatever scheduling policy is supported by pthreads will be supported in uclinux (blackfin)...is my understanding correct?

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2008-03-13 15:40:55 Re: Priorities

Mike Frysinger (UNITED STATES)

Message: 52480 preempt is controlled in the kernel configuration like any other option

pthreads is pthreads ... it doesnt really matter that you're running on a Blackfin processor