From 9452a25d2d8a61849660abb8d34cba673cab0d14 Mon Sep 17 00:00:00 2001
From: davidxu <davidxu@FreeBSD.org>
Date: Tue, 19 Apr 2005 12:31:15 +0000
Subject: [PATCH] Clear P_STATCHILD earlier to avoid unnecessary retrying.

---
 sys/kern/kern_exit.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c
index 67ef152dc08e..d7ff96943d5a 100644
--- a/sys/kern/kern_exit.c
+++ b/sys/kern/kern_exit.c
@@ -588,6 +588,11 @@ kern_wait(struct thread *td, pid_t pid, int *status, int options,
 	if (options &~ (WUNTRACED|WNOHANG|WCONTINUED|WLINUXCLONE))
 		return (EINVAL);
 loop:
+	if (q->p_flag & P_STATCHILD) {
+		PROC_LOCK(q);
+		q->p_flag &= ~P_STATCHILD;
+		PROC_UNLOCK(q);
+	}
 	nfound = 0;
 	sx_xlock(&proctree_lock);
 	LIST_FOREACH(p, &q->p_children, p_sibling) {