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gh-94440: Fix issue of ProcessPoolExecutor shutdown hanging (#94468)

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Fix an issue of concurrent.futures ProcessPoolExecutor shutdown hanging.

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
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yonatanp 2023-03-16 00:44:52 -04:00 • committed by GitHub
parent a44553ea9f
commit 2dc94634b5
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5
Lib/concurrent/futures/process.py
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@ -366,6 +366,11 @@ class _ExecutorManagerThread(threading.Thread):
if self.is_shutting_down():
self.flag_executor_shutting_down()
# When only canceled futures remain in pending_work_items, our
# next call to wait_result_broken_or_wakeup would hang forever.
# This makes sure we have some running futures or none at all.
self.add_call_item_to_queue()
# Since no new work items can be added, it is safe to shutdown
# this thread if there are no pending work items.
if not self.pending_work_items: