How do you exit a (nsIThread || prthread)

[Michael Ahern]

Without returning from the thread "main()" function, how do you exit
from a thread at an arbitrary point.  As far as I can tell, there seems
to be nothing similar to the posix "pthread_exit()" routine.  Short of
calling the native thread libraries directly, is their anyway to exit
the thread without having to "return()"?