gistfile1.py

import gevent
from gevent.hub import get_hub

lst = []
def _on_async():
    oldlen = len(lst)
    for fun, args, kw in lst[:]:
        gevent.spawn(fun, *args, **kw)
    del lst[:oldlen]


def call_in_loop(fun, *args, **kw):
    lst.append((fun, args, kw))
    _async.send()

_async = get_hub().loop.async(ref=False)
_async.start(_on_async)



def show(msg):
    print msg

def doit():
    import time
    for i in range(10):
        time.sleep(0.2)
        call_in_loop(show, i)

import threading
t = threading.Thread(target=doit)
t.start()

gevent.sleep(10)
t.join()