sleep()

[edhall%rand-unix at sri-unix.UUCP]

I don't think &u is EVER woken up.  A signal wakes up a process
via a direct call to setrun(), and not by calling wakeup() on its
current p_wchan.  Take a look in sig.c at the signal routines, and
in slp.c at setrun(), and you'll see what I'm talking about.

		-Ed