diff options
| -rw-r--r-- | Lib/concurrent/futures/process.py | 2 | ||||
| -rw-r--r-- | Misc/NEWS.d/next/Library/2021-04-20-14-14-16.bpo-43498.L_Hq-8.rst | 2 |
2 files changed, 3 insertions, 1 deletions
diff --git a/Lib/concurrent/futures/process.py b/Lib/concurrent/futures/process.py index 19e93a6..695f773 100644 --- a/Lib/concurrent/futures/process.py +++ b/Lib/concurrent/futures/process.py @@ -400,7 +400,7 @@ 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 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`. |