resolve_test_helper.py

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from __future__ import absolute_import, division, print_function, with_statement
from tornado.ioloop import IOLoop
from tornado.netutil import ThreadedResolver
from tornado.util import u

# 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))