> 1. A CancelledError (or maybe`QueueCancelled`?) exception is raised in all producers and consumers ) - this gives a producer a chance to handle the error and do something with the waiting item that could not be `put()`

> 2. Items currently on the queue still get processed in the consumers before the consumers exit.

This (especially 2) sounds quite tricky.

Maybe we should just add a method to Queue to get the list of current consumers, of pending consumers, and pending producers?  This way users can implement whatever semantics they want (probably :wink:).