Module Name: src
Committed By: hannken
Date: Sat Aug 6 11:04:25 UTC 2011
Modified Files:
src/sys/kern: sys_select.c
Log Message:
Fix the races of direct select()/poll():
- When sel_do_scan() restarts do a full initialization with selclear() so
we start from an empty set without registered events. Defer the
evaluation of l_selret after selclear() and add the count of direct events
to the count of events.
- For selscan()/pollscan() zero the output descriptors before we poll and
for selscan() take the sc_lock before we change them.
- Change sel_setevents() to not count events already set.
Reviewed by: YAMAMOTO Takashi <y...@netbsd.org>
Should fix PR #44763 (select/poll direct-set optimization seems racy)
and PR #45187 (select(2) sometimes doesn't wakeup)
To generate a diff of this commit:
cvs rdiff -u -r1.33 -r1.34 src/sys/kern/sys_select.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
