New submission from Julien Danjou <[email protected]>:
Python 3.9 introduced a regression with concurrent.futures. The following
program works fine on Python < 3.8 but raises an error on 3.9:
```
import atexit
import concurrent.futures
def spawn():
with concurrent.futures.ThreadPoolExecutor() as t:
pass
atexit.register(spawn)
```
```
$ python3.9 rep.py
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 790, in exec_module
File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
File
"/usr/local/Cellar/[email protected]/3.9.0_3/Frameworks/Python.framework/Versions/3.9/lib/python3.9/concurrent/futures/thread.py",
line 37, in <module>
threading._register_atexit(_python_exit)
File
"/usr/local/Cellar/[email protected]/3.9.0_3/Frameworks/Python.framework/Versions/3.9/lib/python3.9/threading.py",
line 1370, in _register_atexit
raise RuntimeError("can't register atexit after shutdown")
RuntimeError: can't register atexit after shutdown
```
----------
messages: 383058
nosy: jd
priority: normal
severity: normal
status: open
title: Unable to use concurrent.futures in atexit hook
type: crash
versions: Python 3.9
_______________________________________
Python tracker <[email protected]>
<https://bugs.python.org/issue42647>
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