Part 1 of KSE-III

The ability to schedule multiple threads per process
(one one cpu) by making ALL system calls optionally asynchronous.
to come: ia64 and power-pc patches, patches for gdb, test program (in tools)

Reviewed by:	Almost everyone who counts
	(at various times, peter, jhb, matt, alfred, mini, bernd,
	and a cast of thousands)

	NOTE: this is still Beta code, and contains lots of debugging stuff.
	expect slight instability in signals..

1 files changed, 6 insertions, 4 deletions

diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c
index feaa123..0cd7f27 100644
--- a/sys/kern/kern_exec.c
+++ b/sys/kern/kern_exec.c
@@ -154,12 +154,14 @@ execve(td, uap)
 	PROC_LOCK(p);
 	KASSERT((p->p_flag & P_INEXEC) == 0,
 	    ("%s(): process already has P_INEXEC flag", __func__));
+	if ((p->p_flag & P_KSES) && thread_single(SNGLE_EXIT)) {
+		PROC_UNLOCK(p);
+		mtx_unlock(&Giant);
+		return (ERESTART);	/* Try again later. */
+	}
+	/* If we get here all other threads are dead. */
 	p->p_flag |= P_INEXEC;
 	PROC_UNLOCK(p);
-	
-/* XXXKSE */
-/* !!!!!!!! we need abort all the other threads of this process before we */
-/* proceed beyond his point! */
 
 	/*
 	 * Initialize part of the common data