Created
August 13, 2012 18:48
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Example for waking a poller in another thread by using a PUSH/PULL waker socket pair
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""" | |
Example for waking a poller in another thread by using a PUSH/PULL waker socket pair | |
""" | |
import threading | |
import time | |
import zmq | |
ctx = zmq.Context() | |
# setup the wake machinery | |
waker_pull = ctx.socket(zmq.PULL) | |
waker_push = ctx.socket(zmq.PUSH) | |
waker_pull.bind('inproc://wake') | |
waker_push.connect('inproc://wake') | |
def wake(): | |
waker_push.send(b'Wake up, sleepyhead!') | |
def halt(): | |
waker_push.send(b'die') | |
def worker(waker): | |
"""the worker thread""" | |
rep = ctx.socket(zmq.REP) | |
rep.bind('tcp://127.0.0.1:5555') | |
poller = zmq.Poller() | |
poller.register(waker, zmq.POLLIN) | |
poller.register(rep, zmq.POLLIN) | |
while True: | |
events = dict(poller.poll()) | |
if rep in events: | |
msg = rep.recv_multipart() | |
print "REP received %s" % msg | |
rep.send_multipart(msg) | |
if waker in events: | |
print "I'm up!" | |
msg = waker.recv_multipart() | |
if msg == [b'die']: | |
print "halting..." | |
return | |
worker_thread = threading.Thread(target=worker, args=(waker_pull,)) | |
worker_thread.start() | |
# this is our application socket: | |
req = ctx.socket(zmq.REQ) | |
req.connect('tcp://127.0.0.1:5555') | |
time.sleep(1) | |
print "REQ sending 'hi'" | |
req.send(b'hi') | |
print "REQ received %s" % req.recv_multipart() | |
time.sleep(1) | |
print "waking poller" | |
wake() | |
time.sleep(1) | |
print "REQ sending 'hi again'" | |
req.send_multipart([b'hi', b'again']) | |
print "REQ received %s" % req.recv_multipart() | |
time.sleep(1) | |
print "asking poller to halt" | |
halt() | |
while worker_thread.is_alive(): | |
print '.', | |
time.sleep(0.1) |
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