[Xenomai-core] __xnpod_schedule not getting called

[Xenomai-core] __xnpod_schedule not getting called

[Neri Marschik]

Hi there Xenomai community,

I am implementing a new scheduler for some project and came up with a
question. Maybe it's a beginners question based on a misunderstanding.

If I don't have a periodic task my "pick" function is not getting
called.

I put some prints into the code to see what happens:

VirtualBox kernel: [ 1052.038250] __xnpod_schedule
VirtualBox kernel: [ 1052.038252] xnsched_pick_next
VirtualBox kernel: [ 1052.038253] __xnsched_anytime_exception_pick()
VirtualBox kernel: [ 1052.038255] __xnsched_anytime_main_pick()
VirtualBox kernel: [ 1052.038257] __xnsched_idle_pick()
VirtualBox kernel: [ 1052.038690] __xnpod_schedule

This is normal behavior which repeats forever as long as there is some
periodic task running. 
If I stop this periodic task my non-periodic tasks which should be run
only once are never run because the pick() function is not called
again. 

I noticed that __xnpod_schedule doesn't get called because of this:

	if (testbits(sched->status,
		     XNKCOUT|XNINIRQ|XNSWLOCK|XNRESCHED) != XNRESCHED)
		return;

in: pod.h static inline void xnpod_schedule(void)

I'd appreciate if anyone has an idea about that.

Btw. running version 2.5.5.2


Best regards

Re: [Xenomai-core] __xnpod_schedule not getting called

[Gilles Chanteperdrix]

On 01/18/2012 01:33 PM, Neri Marschik wrote:
> Hi there Xenomai community,
> 
> I am implementing a new scheduler for some project and came up with a
> question. Maybe it's a beginners question based on a misunderstanding.
> 
> If I don't have a periodic task my "pick" function is not getting
> called.
> 
> I put some prints into the code to see what happens:
> 
> VirtualBox kernel: [ 1052.038250] __xnpod_schedule
> VirtualBox kernel: [ 1052.038252] xnsched_pick_next
> VirtualBox kernel: [ 1052.038253] __xnsched_anytime_exception_pick()
> VirtualBox kernel: [ 1052.038255] __xnsched_anytime_main_pick()
> VirtualBox kernel: [ 1052.038257] __xnsched_idle_pick()
> VirtualBox kernel: [ 1052.038690] __xnpod_schedule
> 
> This is normal behavior which repeats forever as long as there is some
> periodic task running. 
> If I stop this periodic task my non-periodic tasks which should be run
> only once are never run because the pick() function is not called
> again. 
> 
> I noticed that __xnpod_schedule doesn't get called because of this:
> 
> 	if (testbits(sched->status,
> 		     XNKCOUT|XNINIRQ|XNSWLOCK|XNRESCHED) != XNRESCHED)
> 		return;
> 
> in: pod.h static inline void xnpod_schedule(void)
> 
> I'd appreciate if anyone has an idea about that.
> 
> Btw. running version 2.5.5.2

Do you reproduce the same behaviour with xenomai 2.5.6?

-- 
                                                                Gilles.