rwatson c2d297d449 Protect the event->class lookup database using an rwlock instead of a
mutex, as it's rarely changed but frequently accessed read-only from
multiple threads, so a potentially significant source of contention.

MFC after:	1 month
Sponsored by:	Apple, Inc.
2008-10-30 17:47:57 +00:00
..
2008-08-24 07:40:14 +00:00
2008-10-24 07:57:48 +00:00