Python multiprocessing exiting cleanly

Python multiprocessing exiting cleanly

I've got a daemon that runs a number of child processes intended to
maintain a telnet connection to collect data from a bunch of weather
stations. I've set it up so that these child processes read from that
telnet connection forever, passing the weather readings back to the parent
process via a multiprocessing.Queue. I can't seem to get these child
processes to exit cleanly when I stop the daemon with ./test.py stop. Is
there an easy way to close the child processes on exit? A quick google
mentioned someone using multiprocessing.Event, what's the best way to set
this event on exit to ensure the processes exit? Here's our current code:
from daemon import runner
from multiprocessing import Process, Queue
import telnetlib
from django.utils.encoding import force_text
from observations.weather.models import WeatherStation
import os
os.environ['DJANGO_SETTINGS_MODULE'] = 'settings'
def read_weather_data(name, ip_address, port, queue):
print "Started process to get data for", name
client = telnetlib.Telnet(ip_address, port)
while True:
response = client.read_until('\r\n'.encode('utf8'))
queue.put((name, force_text(response)))
client.close()
class App(object):
def __init__(self):
self.stdin_path = '/dev/null'
self.stdout_path = '/dev/tty'
self.stderr_path = '/dev/tty'
self.pidfile_path = '/tmp/process_weather.pid'
self.pidfile_timeout = 5
def run(self):
queue = Queue()
for station in WeatherStation.objects.filter(active=True):
p = Process(target=read_weather_data,
args=(station.name, station.ip_address, station.port,
queue,))
p.start()
while True:
name, data = queue.get()
print "Received data from ", name
print data
app = App()
daemon_runner = runner.DaemonRunner(app)
daemon_runner.do_action()