[Xenomai-help] Re: Re: Re: Re: A fairly small rtnet/Xenomai

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

Hi all,

some more interesing measurements:
1) Even when I remove the printf() completely, the system freezes.
My realtimetask is then
static void realtimetask(void *arg)
{
    system("ls -l");
    rt_task_sleep(1000000000ULL);

}

2) When I replace the printf() by a gepid() the behaviour is the same.

3) Jan, your application using the rt_task_shadow behaves the very same (it freezes)!

4) A getpid() directly after system does not help - however, a printf at this position helps to
prevent the freeze.

But now, I found one very interesting thing:
When I rename my /lib/tls to /lib/tls.disabled, it works!!!!
It seems to be (once more) a ugly thread local storage stuff.
The ldd dependency of xeno_crash show libc and libpthread that are take from 
/lib/tls/i686/cmov directory.
Perhaps that could give a hint!

Regards

Mathias

> Hello Philippe,
> >
> > > The important issue to check is the above one. Please try calling
> > > rt_task_delete(NULL), and in a second test, rt_task_suspend(NULL),
> > > instead of letting the thread routine return. TIA,
> > O.K, here are the results:
> > I have placed rt_task_delete() at all possible positions in
> realtimetask().
> > The system freezes when I place rt_task_delete() after the printf()
> statement.
> > At all other positions (after system(), after rt_task_sleep()) the system
> does not freeze.
> > I get the very same results when I use rt_task_suspend() instead of
> rt_task_delete().
> >
> > It means, that the printf() call causes the freeze.
> 
> just to be sure.
> 
> Could you try with other secondary domain calls (instead of printf() )
> : write() (open/close as I suggested before) or even getpid() ?
> 
> (1) instead of the last code line (printf() after rt_task_sleep() ) ;
> 
> (2) put it after system(). Does it still prevent a PC from hanging?
> 
> 
> -- 
> Best regards,
> Dmitry Adamushko
> 

-- 
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