"cheap", RT-safe way of detecting if a thread is Xenomai or Linux

[Giulio Moro]

Hi all,
is there a "cheap", RT-safe call that can be made in order to find out if the current thread is a Xenomai thread or a Linux thread? Also, to detect whether the Xenomai thread is in primary or secondary mode?

It seems that cobalt_thread_mode() gives some (all?) of these details. Is it RT-safe? How much overhead does it incur? Is it the recommended way?

Thanks,
Giulio