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4 changes: 3 additions & 1 deletion Lib/asyncio/proactor_events.py
Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@
import warnings
import signal
import collections
import threading

from . import base_events
from . import constants
Expand Down Expand Up @@ -627,7 +628,8 @@ def __init__(self, proactor):
proactor.set_loop(self)
self._make_self_pipe()
self_no = self._csock.fileno()
signal.set_wakeup_fd(self_no)
if threading.current_thread() is threading.main_thread():
signal.set_wakeup_fd(self_no)

def _make_socket_transport(self, sock, protocol, waiter=None,
extra=None, server=None):
Expand Down