/usr/lib/python3/dist-packages/tornado/test/resolve_test_helper.py is in python3-tornado 4.5.3-1.
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1 2 3 4 5 6 7 8 9 10 11 | from __future__ import absolute_import, division, print_function
from tornado.ioloop import IOLoop
from tornado.netutil import ThreadedResolver
# When this module is imported, it runs getaddrinfo on a thread. Since
# the hostname is unicode, getaddrinfo attempts to import encodings.idna
# but blocks on the import lock. Verify that ThreadedResolver avoids
# this deadlock.
resolver = ThreadedResolver()
IOLoop.current().run_sync(lambda: resolver.resolve(u'localhost', 80))
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