Paolo Gai wrote:
> Dear all,
> 
> here is another small demo... this time of a periodic thread in POSIX.
> 
> It works under Xenomai, but it fails under Posix Real-Time.
> 
> The reason of the failure is the SIGUSR1 not being blocked by the main
> thread. If in main() the comments below the note "// REMOVE THE COMMENTS
> BELOW" are removed, then the signal is masked also in the main(), and as
> a result the POSIX version works.
> 
> The question I have is if the behavior in Xenomai (that is, not failing
> like the POSIX counterpart) is correct or not...
> 

Without having read your program in details and thought about the signal
behaviour as well, just two general remarks:

1. Signals are not yet supported by Xenomai in primary mode. All you
receive are Linux signals so that the real-time thread is effectively
running only in secondary mode (also due to the printf).

2. Periodic threads can be set up more easily and efficiently under
POSIX by using clock_nanosleep with absolute timeouts.

Jan