cpp_by_example/inproc_example.py at master · companycy/cpp_by_example · GitHub

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"""

   Multithreaded relay

   Author: Guillaume Aubert (gaubert) <guillaume(dot)aubert(at)gmail(dot)com>

"""

import threading
import zmq

def step1(context=None):
    """Step 1"""
    context = context or zmq.Context.instance()
    # Signal downstream to step 2
    sender = context.socket(zmq.PAIR)
    sender.connect("inproc://step2")

    sender.send(b"from step1")

def step2(context=None):
    """Step 2"""
    context = context or zmq.Context.instance()
    # Bind to inproc: endpoint, then start upstream thread
    receiver = context.socket(zmq.PAIR)
    receiver.bind("inproc://step2")

    thread = threading.Thread(target=step1)
    thread.start()

    # Wait for signal
    msg = receiver.recv()
    print("%s" % msg)

    # Signal downstream to step 3
    sender = context.socket(zmq.PAIR)
    sender.connect("inproc://step3")
    sender.send(b"from step2")

def main():
    """ server routine """
    # Prepare our context and sockets
    context = zmq.Context.instance()

    # Bind to inproc: endpoint, then start upstream thread
    receiver = context.socket(zmq.PAIR)
    receiver.bind("inproc://step3")

    thread = threading.Thread(target=step2)
    thread.start()

    # Wait for signal
    msg = receiver.recv()
    print("%s" % msg)

    print("Test successful!")

    receiver.close()
    context.term()

if __name__ == "__main__":
    main()