An example for the #gevent IRC channel

example.py

from gevent.queue import Queue
from gevent.event import Event
import gevent
import logging

# The event which brings everything to a halt
stop_event = Event()

# set up logging
logging.basicConfig(filename='expire.log', level=logging.DEBUG)
log_queue = Queue()

def log_writer():
    while not stop_event.is_set():
        if not log_queue.empty():
            log = log_queue.get()
            logging.debug(log)
        gevent.sleep()

def poll():
    log_queue.put('starting poll')
    i = 0
    while not stop_event.is_set():
        gevent.sleep(0.5)
        log_queue.put("iteration %d" % i)
        i += 1

log_worker = gevent.spawn(log_writer)
poll_worker = gevent.spawn(poll)


# why do I only ever see activity in expire.log when I run either
log_worker.join()
# or
poll_worker.join()

# I would expect the greenlets to run in the background like a thread