[zeromq-dev] Try to run a very simple example wih pyzmq and multiprocessing

SUDRES Xavier xavier.sudres at atos.net
Thu Mar 27 15:42:26 CET 2014


I'm trying to run a very simple example code using pyzmq and multiprocessing. I just want to have two threads communicating through an zmq socket (inproc or ipc).

I'm using the following code:

import zmq
from multiprocessing import Process

def main():

    uri = "ipc:///tmp/FORK"
    context = zmq.Context()

    pipe = context.socket(zmq.PAIR)
    print("bind", uri)
    pipe.bind(uri)

    p = Process(target=thread, args=(context, uri, zmq.PAIR))
    p.start()

    print("Fork done, receiving...")
    print(pipe.recv_string())
    print("Received !!!")

    p.join()
    del pipe
    del context

def thread(context, uri, socketType):
    pipe = context.socket(socketType)
    print("connect", uri)
    pipe.connect(uri)

    print("Thread send Hello...")
    pipe.send_string("Hello")

main()

Screen output =
bind ipc:///tmp/FORK
Forked, receiving...
connect ipc:///tmp/FORK
Thread send Hello...

I'have detected a little error while installing the version of pyzmq(master) using cython 0.20 :
Configure: Autodetecting ZMQ settings...
    Custom ZMQ dir:       /home_local/xsudres/dev/src/LPISIS/COTS/ZEROMQ/work/zeromq
creating build/temp.linux-x86_64-3.4/scratch/tmp
cc -c /tmp/timer_create6cc83401.c -o build/temp.linux-x86_64-3.4/scratch/tmp/timer_create6cc83401.o
cc build/temp.linux-x86_64-3.4/scratch/tmp/timer_create6cc83401.o -o build/temp.linux-x86_64-3.4/scratch/a.out
build/temp.linux-x86_64-3.4/scratch/tmp/timer_create6cc83401.o: In function `main':
timer_create6cc83401.c:(.text+0x15): undefined reference to `timer_create'
collect2: ld returned 1 exit status
gcc -pthread -Werror=declaration-after-statement -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I/home_local/xsudres/dev/src/LPISIS/COTS/ZEROMQ/work/zeromq/include -Izmq/utils -Izmq/backend/cython -Izmq/devices -c build/temp.linux-x86_64-3.4/scratch/vers.c -o build/temp.linux-x86_64-3.4/scratch/vers.o
gcc -pthread build/temp.linux-x86_64-3.4/scratch/vers.o -L/home_local/xsudres/dev/src/LPISIS/COTS/ZEROMQ/work/zeromq/lib -Wl,--enable-new-dtags,-R/home_local/xsudres/dev/src/LPISIS/COTS/ZEROMQ/work/zeromq/lib -lzmq -lrt -o build/temp.linux-x86_64-3.4/scratch/vers
    ZMQ version detected: 4.0.4

=> undefined reference to `timer_create', is it important ?

Thanks for your help,

Xavier SUDRES
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