added some additional documentation on thread safe queue
added some additional documentation on thread safe queue

sirikata/sirikata,sirikata/sirikata,robertkhamilton/sirikata,sirikata/sirikata,sirikata/sirikata,robertkhamilton/sirikata,sirikata/sirikata,robertkhamilton/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata