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bpo-43498: Fix dictionary iteration error in _ExecutorManagerThread (GH-24868)

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(cherry picked from commit 7431448b81)

Co-authored-by: Jakub Kulík <Kulikjak@gmail.com>
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Miss Islington (bot) 2021-11-29 04:24:08 -08:00 • committed by GitHub
parent 4d2cc3ed46
commit 4b11d71185
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2 changed files with 3 additions and 1 deletions
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2
Lib/concurrent/futures/process.py
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@ -373,7 +373,7 @@ class _ExecutorManagerThread(threading.Thread):
assert not self.thread_wakeup._closed
wakeup_reader = self.thread_wakeup._reader
readers = [result_reader, wakeup_reader]
worker_sentinels = [p.sentinel for p in self.processes.values()]
worker_sentinels = [p.sentinel for p in list(self.processes.values())]
ready = mp.connection.wait(readers + worker_sentinels)
cause = None

2
Misc/NEWS.d/next/Library/2021-04-20-14-14-16.bpo-43498.L_Hq-8.rst Normal file
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@ -0,0 +1,2 @@
Avoid a possible *"RuntimeError: dictionary changed size during iteration"*
when adjusting the process count of :class:`ProcessPoolExecutor`.