From 86854445437574dfbbb2a2f8c672a3e1400cd3a9 Mon Sep 17 00:00:00 2001
From: David Xu <davidxu@FreeBSD.org>
Date: Tue, 11 Mar 2003 06:01:44 +0000
Subject: [PATCH] This is a force-commit for: kern_sig.c	1.215 kern_thread.c
 1.103 kern_exit.c	1.199 proc.h		1.302

Orignal code would suspend an already suspended thread,
if user presses ^Z while a threaded program is running. Also
there is a race between job control and thread_exit(),  the
new code tests job control requesting before thread exits,
in wait() syscall, be sure to check child process is fully
stopped, this avoids a later SIGCHILD and returns STOPPED
status twice for a threaded child proc. A thread_stopped()
function is added for common code in several places.