* The documentation for the LOCK() function says that it will block for up to

  3 seconds while waiting on a lock when other locks are currently held to
  avoid deadlocks.  Change the code to reflect this.
* Since trying to grab a lock may block for some time, put the channel in
  autoservice so that audio is still read from the channel and that any
  active generators on the channel don't pause.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@84143 65c4cc65-6c06-0410-ace0-fbb531ad65f3