[zeromq-dev] ZeroMQ 2.1.11 - poll returns errno 11 on ZMQ_SUB sockets

Rajalakshmi Iyer raj at blismobile.com
Mon Mar 26 18:29:09 CEST 2012


Just an update,

I have also tried adding:

subscriber.setsockopt(ZMQ_SUBSCRIBE, "", 0);

so the subscriber will subscribe to all messages.

But this did not help either.

Thanks,
Raj

On 26 March 2012 17:14, Rajalakshmi Iyer <raj at blismobile.com> wrote:

> Hello,
>
> I am trying a simple PUBLISH/SUBSCRIBE setup with ZeroMQ 2.1.11.
>
> Here is the server code:
>
>
> ------------------------------------------------------------------------------------------------------------------------
> #include <zmq.hpp>
> #include <iostream>
> using namespace std;
>
> int main(void)
> {
>     try
>     {
>         zmq::context_t context(1);
>         zmq::socket_t publisher(context, ZMQ_PUB);
>         publisher.bind("tcp://*:5556");
>         sleep(5);
>
>         while(1)
>         {
>             char* command = "Command";
>             zmq::message_t msg(command, strlen(command), NULL, NULL);
>             if (!publisher.send(msg))
>             {
>                 cout << "Unable to send message" << endl;
>             }
>             sleep(2);
>         }
>     }
>     catch (zmq::error_t& e)
>     {
>         cout << "ZMQ Exception : " << e.what() << endl;
>     }
>     return 0;
> }
>
> ------------------------------------------------------------------------------------------------------------------------
>
> And this is the client code:
>
> ------------------------------------------------------------------------------------------------------------------------
> #include <zmq.hpp>
> #include <iostream>
> using namespace std;
>
> int main()
> {
>     try
>     {
>         zmq::context_t context(1);
>         cout << "Serving commands ..." << endl;
>
>         zmq::socket_t subscriber(context, ZMQ_SUB);
>         subscriber.connect("tcp://localhost:5556");
>
>         sleep(2);
>
>         while(1)
>         {
>             zmq::pollitem_t items[] = {
>                 {(void*)subscriber, 0, ZMQ_POLLIN, 0}
>             };
>
>             int rc = zmq::poll(items, 1, 1);
>             cout << "zmq_poll(rc=" << errno << ")" << endl;
>
>             if (items[0].revents & ZMQ_POLLIN)
>             {
>                 zmq::message_t command;
>                 if (!subscriber.recv(&command, ZMQ_NOBLOCK))
>                 {
>                     cout << "Failed to receive command" << endl;
>                 }
>                 cout << "Received command: " << (char*)command.data() <<
> endl;
>             }
>         }
>     }
>     catch (zmq::error_t& e)
>     {
>         cout << "ZMQ Exception : " << e.what() << endl;
>     }
>     return 0;
> }
>
> ------------------------------------------------------------------------------------------------------------------------
>
>
> The server is sending commands every 2 seconds over the ZMQ_PUB socket.
> The client does zmq_poll on the ZMQ_SUB socket in a loop. However, the
> client always sees errno 11 on a zmq_poll (which seems to indicate Resource
> Temporarily Unavailable).
>
> I have tried to figure out the cause from other posts in the mailing
> lists. They seemed to indicate adding a sleep after the bind/connect phase
> before starting to send/recv data. Even that has not helped.
>
> Apologies, if this has been answered earlier, but it would be really great
> if someone can help me out here.
>
> Thanks,
> Raj.
>

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