CVS commit: [netbsd-9] src/sys/kern

["Martin Husemann" <martin%netbsd.org@localhost>]

Module Name:    src
Committed By:   martin
Date:           Thu Feb  4 16:57:25 UTC 2021

Modified Files:
        src/sys/kern [netbsd-9]: kern_event.c

Log Message:
Pullup the following (requested by jdolecek in ticket #1191):

        sys/kern/kern_event.c   r1.110-1.115 (via patch)

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
kq_count when actually completely done with the kevent

PR kern/50094 by Christof Meerwal

Also fixes timer latency in Go, as reported in
https://github.com/golang/go/issues/42515 by Michael Pratt


To generate a diff of this commit:
cvs rdiff -u -r1.104 -r1.104.4.1 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.