K 10 svn:author V 7 rwatson K 8 svn:date V 27 2009-02-06T12:06:39.232319Z K 7 svn:log V 281 Merge r184482 from head to stable/7: 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. Sponsored by: Apple, Inc. END