Fixed #21420 -- Autoreloader on BSD with Python 3.

from django.conf import settings

from django.core.signals import request_finished

from django.utils import six

try:

    from django.utils.six.moves import _thread as thread

except ImportError:

    # New modules may get imported when a request is processed. We add a file

    # descriptor to the kqueue to exit the kqueue.control after each request.

    watcher = tempfile.TemporaryFile(bufsize=0)

    buf_kwargs = {'buffering' if six.PY3 else 'bufsize': 0}

    watcher = tempfile.TemporaryFile(**buf_kwargs)

    kqueue.control([make_kevent(watcher)], 0)

    def update_watch(sender=None, **kwargs):