Critical section

[Godzil]

I may need to have critical section in my code (to make some part  
atomic like sending to mailbox or things like that)

It seem like rt_sched_lock and rt_sched_unlock only make the system  
crash.

What should I take care with using this two function ?

I think that linux call are stricly forbiden since the scheduler is  
needed for hard/soft changing.

Does anything else to take care ?

Thanks

Manoel