github/hubot — pull request #639 by alindeman (2014-01-20 03:30:18+00:00)
Title: More reliable locking

* Checking if the original message is private is not sufficient to
guarantee that the response will be sent privately; if the room is
unlocked before the message can be sent, the message may not be sent
privately. The first fix is to always attempt to lock the room when
sending a private reply.
* Count the number of pending lock/unlock operations and only unlock
after the final one has completed. This prevents asynchronous
interleaving unlocking operations from causing messages not to be sent
privately.