[Xenomai-help] rt_sem_p: No such process

[Xenomai-help] rt_sem_p: No such process

[Stuart O Anderson]

Hello -

I'm seeing rt_sem_p and rt_sem_broadcast return a "No such process"
error code, which isn't one of the listed possibilities in the
documentation.  This must be happening because the call to
xeno_h2obj_validate on line 495 in ksrc/skins/native/sem.c is
returning NULL.

This happens, but not consistently, when I kill one of the two
user-space realtime processes that are using the semaphore (the other
one then gets this error every time it tries to touch the semaphore).
Restarting the second process, and re-binding to the semaphore does
not stop the error from occurring.

Stuart

Re: [Xenomai-help] rt_sem_p: No such process

[Gilles Chanteperdrix]

Stuart O Anderson wrote:
> Hello -
> 
> I'm seeing rt_sem_p and rt_sem_broadcast return a "No such process"
> error code, which isn't one of the listed possibilities in the
> documentation.  This must be happening because the call to
> xeno_h2obj_validate on line 495 in ksrc/skins/native/sem.c is
> returning NULL.
> 
> This happens, but not consistently, when I kill one of the two
> user-space realtime processes that are using the semaphore (the other
> one then gets this error every time it tries to touch the semaphore).
> Restarting the second process, and re-binding to the semaphore does
> not stop the error from occurring.

Hi.

the usual details are missing:
- platform,
- version of linux,
- version of xenomai,
- kernel logs,
- simplified but self-contained code which will allow us to reproduce
the problem.

-- 
                                          Gilles