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

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

[-- Attachment #1.1: Type: text/plain, Size: 2374 bytes --]

Hi Jan!

I have modified my test to use a sleep(1) at the end of the task functions.
I have enclosed the strace logs to this mail.
The file strace.tls is the one that uses the /lib/tls/... libraries.
The file strace is the one that uses the /lib/... libraries.

I hope that helps...
BTW: I have updated to the latest SVN version of Xenomai (kernel is 2.6.17.7) - the same effect here.

Thanks for the feedback!

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.
> 
> You mean completely? Or just that application? Please enable the Xenomai
> watchdog to see if we have a run-away RT thread in that case.
Only the application hangs!

> 
> > 
> > I have done two tests to verify if there is an SMP issue.
> > First, I have set all CPUs in use with the application to CPU 0.
> > There was no change. However, I am able to stop the application with
> CTRL-C
> > and everything is cleaned up fine.
> > 
> > Then, I have modified the BIOS settings of the PC to disable
> Hyperthreading.
> 
> [Which is recommended anyway to keep latencies bounded - HT is evil for
> RT!]
> 
> > Again, no change. The same effect as with the test before.
> > 
> > The strange thing here is, when I use the original test (main on CPU 0, rt
> tasks on CPU 1)
> > on a SMP machine, I am not able to terminate the application with CTRL-C.
> > I have to reboot the PC.
> > 
> > That means, there seems to be a relation to SMP...
> 
> Probably in so far that the symptom changes. But !SMP doesn't make it go
> away.
> 
> > 
> > Another thing I have detected:
> > When I modify the program to replace the final rt_task_delete by
> > a sleep(1) call everything runs perfectly again.
> 
> Ok, could you try on a non-hanging setup to grab what is happening via
> strace?


-- 
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

[-- Attachment #2: strace.tgz --]
[-- Type: application/octet-stream, Size: 2102 bytes --]