git: kernel - Refactor kqueue interlocks
commit 4371bb25c4dc6be21df04e7de72b65682ca9f4c4
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date: Mon Sep 6 18:44:03 2010 -0700
kernel - Refactor kqueue interlocks
* Make KN_PROCESSING a soft lock flag. When set nobody else can mess
with a particular knote (other than setting certain flags) even if
the originator blocks.
* Interlock major processing with KN_PROCESSING. Registration, event
scan, knote(), deletion, and filter ops.
* Block & restart when conflicts occur. For the knote() hot-path we only
block and restart if the 'hint' is non-zero, otherwise we just flag with
KN_REPROCESS to indicate that reprocessing is required.
* This should fix kqueue races related to blocking operations confusing
the list scan.
* Document the shit out of everything.
Reported-by: Francois Tigeot <ftigeot@wolfpond.org>
Summary of changes:
sys/kern/kern_event.c | 344 +++++++++++++++++++++++++++++++++++--------------
sys/sys/event.h | 18 ++-
2 files changed, 255 insertions(+), 107 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/4371bb25c4dc6be21df04e7de72b65682ca9f4c4
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