cs.queues 20150115

some Queue subclasses and ducktypes

Presents:

• IterableQueue and IterablePriorityQueue, Queues with the iterator protocol instead of .get(). Prospective users should also consider iter(Queue.get,sentinel), which plainly I did not.

• Channel, a zero storage message passing object.

• NullQueue, a .puttable object that discards its inputs.

• TimerQueue, a queue for submtting jobs to run at specific times without creating many Timer threads.

• PushQueue, a Queue ducktype which queues a function on .put, whose iterable result is put onto an output Queue.