Re: exit ThreadPoolExecutor immediately

[woooee]

Doug Hellmann has what looks like a similar example using a poison pill (2nd 
example at) 
https://pymotw.com/2/multiprocessing/communication.html#multiprocessing-queues  
Note that join() allows the processes to finish so it you don't care then don't 
"join()" them.  You can also terminate a multiprocessing thread 
https://pymotw.com/2/multiprocessing/basics.html#terminating-processes
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