Linux RT Preempt - Are POSIX threads required?

I've read through this example and browsed through this wiki regarding real-time application development with a PREEMPT patched kernel. The former uses POSIX threads and the latter only references the need for PTHREAD_PRIO_INHERIT mutexes.

So I haven't seen anything that says I explicitly need POSIX threads to take advantage of the PREEMPT patch, but it seems suggested in a way. Would I still receive the benefit of the PREEMPT patch if I implemented native C++11 threads or boost threads?

Thanks