[issue2496] test_no_refcycle_through_target sometimes fails in test_threading

[Jeffrey Yasskin]

Jeffrey Yasskin <jyasskin at gmail.com> added the comment:

I think I've confirmed your diagnosis. If I add a _sleep(.01) to
Thread.__bootstrap_inner() just after the call to self.__stop(), the
test fails reliably. Very good catch! Given that, I think just adding a
short sleep to the test before counting references will fix it nearly
every time, but I'd like to kill the race dead if we can.

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