"jason.greene(a)jboss.com" wrote : Ah I see this is to handle the case of a blocked/queued thread acquiring a lock. Hmm this kind of defeats the performance benefit of aqs lock queueing Yeah I know it completely defeats the purpose of AQS queueing and just uses the lock as a token. The real "lock" here is holding a position in the CHM. Sucky, but well... View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4219387#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...