Martin Panter added the comment:

I don’t know much about the concurrent.futures testing, but in general IMO it 
makes more sense to call thread.join(), or at least @reap_threads, in each 
individual test case that needs it. If appropriate, you can call join() with a 
one-second timeout, which should be functionally equivalent to @reap_threads. 
Leaving a background thread running while you start another test seems like a 
bad idea; concurrent tests aren’t meant to be run in the same process.

Also, I added a gc_collect() call to the test infrastructure in Issue 27787, 
which may help avoid problems with spurious “dangling” thread object references.

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nosy: +martin.panter

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<http://bugs.python.org/issue16968>
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