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import asyncio | |
import atexit | |
from contextlib import ExitStack | |
from anyio.from_thread import start_blocking_portal | |
exit_stack = ExitStack() | |
portal = exit_stack.enter_context(start_blocking_portal()) | |
atexit.register(exit_stack.close) | |
portal.call(asyncio.sleep, 1) |
I only tested this on Python 3.8, and it seems to hang on any later version.
A bug in CPython?
I think I see the problem. start_blocking_portal()
is using a concurrent.futures.ThreadPoolExecutor
behind the scenes, and these started using non-daemonic threads in Python 3.9, so atexit
callbacks aren't run, leading to a deadlock. I'll need to make it use plain daemonic Thread
instead for consistency.
I think I see the problem.
start_blocking_portal()
is using aconcurrent.futures.ThreadPoolExecutor
behind the scenes, and these started using non-daemonic threads in Python 3.9, soatexit
callbacks aren't run, leading to a deadlock. I'll need to make it use plain daemonicThread
instead for consistency.
Nothing is ever as easy as it should be! 😅 I'm glad you could see the root cause as debugging that was definitely outside my experience/expertise!
Simply running the
example.py
also hangs for me: