Re: Re: [Xenomai-help] Re: Re: What happens if task entry function

["M. Koehrer" <mathias_koehrer@domain.hid>]

Hi Philppe,

thanks for the patch. Using this patch, my test application is working now!
I have also update to the latest SVN version (1882) of Xenomai.
Using this version, the application works perfectly, too.

Regards

Mathias

> > First, I give you some more information about the error.
> > The output is the following:
> > Hi, I am task A Hello
> > Hi, I am task B World
> > Main waits for A
> > This is the end of A
> > Main waits for B
> > 
> > Then the system hangs.
> > 
> 
> Confirmed here on a two-way PIII. Well, _this_ was a nice one.
> Basically, the softlock was due to a missing rescheduling call after
> task A has exited, leaving task B in ready state, somewhere in the
> Twilight Zone. The patch below fixes it on my setup:
> 
> --- ksrc/nucleus/shadow.c	(revision 1854)
> +++ ksrc/nucleus/shadow.c	(working copy)
> @@ -1631,7 +1631,8 @@
>  
>  static inline void do_taskexit_event(struct task_struct *p)
>  {
> -	xnthread_t *thread = xnshadow_thread(p);	/* p == current */
> +	xnthread_t *thread = xnshadow_thread(p); /* p == current */
> +	spl_t s;
>  
>  	if (!thread)
>  		return;
> @@ -1639,12 +1640,15 @@
>  	if (xnpod_shadow_p())
>  		xnshadow_relax(0);
>  
> -	/* So that we won't attempt to further wakeup the exiting task in
> -	   xnshadow_unmap(). */
> -
> +	xnlock_get_irqsave(&nklock, s);
> +	/* Prevent wakeup call from xnshadow_unmap(). */
>  	xnshadow_thrptd(p) = NULL;
>  	xnthread_archtcb(thread)->user_task = NULL;
> -	xnpod_delete_thread(thread);	/* Should indirectly call xnshadow_unmap().
> */
> +	/* xnpod_delete_thread() -> hook -> xnshadow_unmap(). */
> +	xnpod_delete_thread(thread);
> +	xnsched_set_resched(thread->sched);
> +	xnpod_schedule();
> +	xnlock_put_irqrestore(&nklock, s);
>  
>  	xnltt_log_event(xeno_ev_shadowexit, thread->name);
>  }
> 
> -- 
> Philippe.
> 
> 
> 

-- 
Mathias Koehrer
mathias_koehrer@domain.hid


Viel oder wenig? Schnell oder langsam? Unbegrenzt surfen + telefonieren
ohne Zeit- und Volumenbegrenzung? DAS TOP ANGEBOT JETZT bei Arcor: günstig
und schnell mit DSL - das All-Inclusive-Paket für clevere Doppel-Sparer,
nur  44,85 €  inkl. DSL- und ISDN-Grundgebühr!
http://www.arcor.de/rd/emf-dsl-2