[zeromq-dev] Non-Blocking REQ/REP Server

Charles Remes lists at chuckremes.com
Tue Feb 19 15:52:36 CET 2013

Take a look at the man page for zmq_poll. You can do a non-blocking poll for incoming messages on your socket. If it returns immediately with 0, then no sockets in your pollset have pending messages to read.

Be aware that when zmq_poll does indicate that you have messages, you must read *all* of them from the socket before zmq_poll will work again. I'm pretty sure the man page explains this.

Good luck.

On Feb 19, 2013, at 8:44 AM, Lee Sylvester <lee.sylvester at gmail.com> wrote:

> Hey guys,
> So, I've integrated ØMQ into my server.  Now, I want to use ØMQ as a means to supply information to a HTTP server from a separate management app.  So, in theory, it will look something like this
> int read_zmq_connections() {
>    int ret = 0;
>    while (zmq_has_messages(zmq_responder)) {
>        char *str = s_recv(zmq_responder);
>        parse_new_data(str);
>        free(str);
>        ++ret;
>    }
>    return ret;
> }
> This way, if there are no messages on zmq_responder, then the function will simply return.  What I don't know how to do (and can't quite find) is how to check if messages exist on the connection.  Can anyone please point me in the right direction?
> The reason why I need this non-blocking is that I will only be calling 'read_zmq_connections' approximately once every five minutes and I don't want my app to hang while waiting for messages.
> Thanks loads in advance,
> Lee
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