bpo-43498: Fix dictionary iteration error in _ExecutorManagerThread (GH-24868)
![](https://secure.gravatar.com/avatar/cc7737cd64a84f1b5c61a160798e97ee.jpg?s=120&d=mm&r=g)
https://github.com/python/cpython/commit/7431448b817d3bf87f71661cf8f3d537807... commit: 7431448b817d3bf87f71661cf8f3d537807ab2e2 branch: main author: Jakub KulĂk <Kulikjak@gmail.com> committer: asvetlov <andrew.svetlov@gmail.com> date: 2021-11-29T14:02:56+02:00 summary: bpo-43498: Fix dictionary iteration error in _ExecutorManagerThread (GH-24868) files: A Misc/NEWS.d/next/Library/2021-04-20-14-14-16.bpo-43498.L_Hq-8.rst M Lib/concurrent/futures/process.py diff --git a/Lib/concurrent/futures/process.py b/Lib/concurrent/futures/process.py index 19e93a608b276..695f7733305ed 100644 --- a/Lib/concurrent/futures/process.py +++ b/Lib/concurrent/futures/process.py @@ -400,7 +400,7 @@ def wait_result_broken_or_wakeup(self): 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 diff --git a/Misc/NEWS.d/next/Library/2021-04-20-14-14-16.bpo-43498.L_Hq-8.rst b/Misc/NEWS.d/next/Library/2021-04-20-14-14-16.bpo-43498.L_Hq-8.rst new file mode 100644 index 0000000000000..4713d1427ccd3 --- /dev/null +++ b/Misc/NEWS.d/next/Library/2021-04-20-14-14-16.bpo-43498.L_Hq-8.rst @@ -0,0 +1,2 @@ +Avoid a possible *"RuntimeError: dictionary changed size during iteration"* +when adjusting the process count of :class:`ProcessPoolExecutor`.
participants (1)
-
asvetlov