Attempt to clarify comment in selrecord.

1 files changed, 8 insertions, 4 deletions

diff --git a/sys/kern/sys_generic.c b/sys/kern/sys_generic.c
index e4e40cf..165284c 100644
--- a/sys/kern/sys_generic.c
+++ b/sys/kern/sys_generic.c
@@ -1147,10 +1147,14 @@ selrecord(selector, sip)
 
 	mtx_lock(&sellock);
 	/*
-	 * If the thread is NULL then take ownership of selinfo
-	 * however if the thread is not NULL and the thread points to
-	 * someone else, then we have a collision, otherwise leave it alone
-	 * as we've owned it in a previous selrecord on this selinfo.
+	 * If the selinfo's thread pointer is NULL then take ownership of it.
+	 *
+	 * If the thread pointer is not NULL and it points to another
+	 * thread, then we have a collision.
+	 *
+	 * If the thread pointer is not NULL and points back to us then leave
+	 * it alone as we've already added pointed it at us and added it to
+	 * our list.
 	 */
 	if (sip->si_thread == NULL) {
 		sip->si_thread = selector;