New submission from Nic Watson <[email protected]>:
If a signal handler callback is registered on an event loop, and the event loop
has close() called on it, the close will fail.
Exception:
Exception in thread Thread-1:
Traceback (most recent call last):
File "/home/nic/.pyenv/versions/3.7.0/lib/python3.7/threading.py", line 917,
in _bootstrap_inner
self.run()
File "/home/nic/.pyenv/versions/3.7.0/lib/python3.7/threading.py", line 865,
in run
self._target(*self._args, **self._kwargs)
File "/home/nic/tmp/signal_event_loop_bug.py", line 9, in do_loop
loop.close()
File "/home/nic/.pyenv/versions/3.7.0/lib/python3.7/asyncio/unix_events.py",
line 58, in close
self.remove_signal_handler(sig)
File "/home/nic/.pyenv/versions/3.7.0/lib/python3.7/asyncio/unix_events.py",
line 147, in remove_signal_handler
signal.signal(sig, handler)
File "/home/nic/.pyenv/versions/3.7.0/lib/python3.7/signal.py", line 47, in
signal
handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
ValueError: signal only works in main thread
Code:
import asyncio
import signal
import threading
def mysighandler():
pass
def do_loop(loop):
loop.close()
loop = asyncio.new_event_loop()
loop.add_signal_handler(signal.SIGINT, mysighandler)
t = threading.Thread(target=do_loop, args=(loop,))
t.start()
t.join()
----------
components: asyncio
messages: 325354
nosy: asvetlov, jnwatson, yselivanov
priority: normal
severity: normal
status: open
title: asyncio event_loop close fails off main thread if signal handler
registered
type: behavior
versions: Python 3.6, Python 3.7
_______________________________________
Python tracker <[email protected]>
<https://bugs.python.org/issue34680>
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