Re: [Xenomai-help] task management, multi-thread, multi-core

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

Everett Wang wrote:
> On Wed, Jul 7, 2010 at 7:24 PM, Gilles Chanteperdrix
> <gilles.chanteperdrix@xenomai.org> wrote:
>> Everett Wang wrote:
>>> If the second task is running already, when the
>>> higher priority
>>> task is waiting for an outside event, then the event comes, the high
>>> priority task
>>> has to wait until the lower priority one to finish?
>> No. Xenomai scheduler is preemptive:
>> http://en.wikipedia.org/wiki/Preemptive_multitasking
> 
> That is why I thought to cut the lower priority but more CPU comsuming
> task into smaller pieces and only let it run for one piece at a time
> then wait so
> higher priority task don't have to wait. Once the higher priority task has
> done its thing, then send a trigger to the let the lower priority task to run
> one more chunk. Is this the right thing to do or I am totally off the track?

You are off the track. As I said, the scheduler is preemptive.

-- 
					    Gilles.