commit 4b11d7118561a12322d3cfa76c5941690b241149
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Mon Nov 29 04:24:08 2021 -0800
committer GitHub <noreply@github.com> Mon Nov 29 04:24:08 2021 -0800
tree dd70d71fa3412d7ce0b8419fafdc0b419440f63b
parent 4d2cc3ed46d2453bad92243128e237e7febca714

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

(cherry picked from commit 7431448b817d3bf87f71661cf8f3d537807ab2e2)

Co-authored-by: Jakub Kulík <Kulikjak@gmail.com>

Lib/concurrent/futures/process.py

diff --git a/Lib/concurrent/futures/process.py b/Lib/concurrent/futures/process.py
index 7647198..6ee2ce6 100644
--- a/Lib/concurrent/futures/process.py
+++ b/Lib/concurrent/futures/process.py
@@ -373,7 +373,7 @@ 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

Misc/NEWS.d/next/Library/2021-04-20-14-14-16.bpo-43498.L_Hq-8.rst

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 0000000..4713d14
--- /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`.