PR/50094 CVS commit: src/sys/kern

["Jaromir Dolecek" <jdolecek%netbsd.org@localhost>]

The following reply was made to PR kern/50094; it has been noted by GNATS.

From: "Jaromir Dolecek" <jdolecek%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/50094 CVS commit: src/sys/kern
Date: Wed, 20 Jan 2021 21:39:09 +0000

 Module Name:	src
 Committed By:	jdolecek
 Date:		Wed Jan 20 21:39:09 UTC 2021
 
 Modified Files:
 	src/sys/kern: kern_event.c
 
 Log Message:
 fix a race in kqueue_scan() - when multiple threads check the same
 kqueue, it could happen other thread seen empty kqueue while kevent
 was being checked for re-firing and re-queued
 
 make sure to keep retrying if there are outstanding kevents even
 if no kevent is found on first pass through the queue, and only
 drop the KN_QUEUED flag and kq_count when actually completely done
 with the kevent
 
 change is inspired by the FreeBSD in-flux handling, but without
 introducing the reference counting
 
 PR kern/50094 by Christof Meerwald
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.110 -r1.111 src/sys/kern/kern_event.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.