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places that cared about device states were app_queue and the hint code in pbx.c. The changes include converting it to use the Asterisk event system, as well as other efficiency improvements. * app_queue: This module used to register a callback into devicestate.c to monitor device state changes. Now, it is just a subscriber to Asterisk events with the type, device state. * pbx.c hints: Previously, the device state processing thread in devicestate.c would call ast_hint_state_changed() each time the state of a device changed. Then, that code would go looking for all the hints that monitor that device, and call their callbacks. All of this blocked the device state processing thread. Now, the hint code is a subscriber of Asterisk events with the type, device state. Furthermore, when this code receives a device state change event, it queues it up to be processed by another thread so that it doesn't block one of the event processing threads. git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@66958 65c4cc65-6c06-0410-ace0-fbb531ad65f3