[Xenomai] Are concurrent writes to XDDP sockets allowed ?

[Thierry Bultel <thierry.bultel@basystemes.fr>]

Hi,
In an application, we have one regular thread listening on an RTP device,
and 2 realtime threads that concurrently write data in the XDDP socket 
backend.
We use the POSIX skin.

Sometimes, the regular thread gets its blocking read() call just return 0.
That never happens with the classic "one reader, one writer" case.

Also, we notice that the 'return 0' case occurrence is not the same, 
depending
on the fact that the realtime task uses 'write' instead of 'sendto' 
(more occurrences with 'sendto')

Regards,
Thierry