[Xenomai] xeno3_rc3_alchemy What is the effect of rt_task_delete on a RT_SEM?

[Niels Wellens <niels.wellens@triphase.com>]

Hi,

While porting our code to xeno3 I noticed that one of our tasks blocked
on a semaphore during exit (code worked on xeno 2.6.4 Native, some small
changes where needed for Alchemy but nothing fundamental). It seems that
deletion of a task that is waiting on a RT_SEM doesn't decrement the
nwaiters field of the semaphore. Afterwards, when I raise the semaphore,
the nwaiters decrement without releasing an existing task. Are there
some changes here in Xeno3? I looked in the migration guide but the only
remark about semaphores is for posix.

Please find in attachment a small working example with some comments in
the exit part of the code.

Thanks in advance!
Kind regards,
Niels
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