RE: [microblaze-uclinux] Microblaze system freeze

[pcolodron@xxxxxxxx]

Hi everybody,

I am experiencing the same problem as Otto did when using a  
multithreaded application (in my case is a graphical application).

Do you know if there any pach available to solve this kind of problems  
with pthreads library?

Thank you very much for your help.

Kind regards,

Pablo Colodron





Hi,

John Williams wrote:
> Hi Otto, Falk,
>
> Otto Blomqvist wrote:
>
> > That is possible. I just didn't think it could freeze the whole >  
> system..! Interesting, I'll take a look at the code.
>
> A userspace/pthreads priority inversion shouldn't lockup the entire system,
Please, read my old discussion here on
http://mailman.uclinux.org/pipermail/uclinux-dev/2006-October/040709.html.
I had to patch semaphore.c and spinlock.h in  
uclinux_dist/uClibc/libpthread/linuxthreads
because of the Linux hangs I experienced with my user app. Though my  
patch (for the 2.4
kernel) were rejected because it does not fly for uClinux in general  
(e.g. it wasn't
SMP-safe).

The discussion ended up with the conclusion that the problem (hang due  
thread priority
inversion) will remain until we use kernel 2.6 plus the NPTL library  
instead of pthreads.

CU, F@lk

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