1999-01-07 Xavier Leroy <Xavier.Leroy@inria.fr>

1999-01-07  Xavier Leroy  <Xavier.Leroy@inria.fr>

	* pthread.c: Use a third signal __pthread_sig_debug distinct
	from __pthread_sig_cancel to notify gdb when a thread is
	created
	* manager.c: Likewise.
	* internals.h: Likewise.
	* signals.c: The implementation of sigwait(s) assumed that
	all signals in s have signal handlers already attached.
	This is not required by the standard, so make it work
	also if some of the signals have no handlers.