[Aio] Make completion queue shutdown stricter#22758
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lidizheng merged 1 commit intogrpc:masterfrom Apr 23, 2020
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gnossen
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Apr 23, 2020
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If there are multiple threads initializing AsyncIO stack (like in
pytest), it might trigger a race condition that previous poller thread wasn't joined and new poller thread becomes alive. So, this PR make the shutdown procedure of poller completion queue stricter to ensure the poller thread has received the shutdown event.