[zeromq-dev] zmq_poll not working on Windows

[Marko.Dieckmann at gmx.de]

Hello everyone,

 I tried to make zmq_poll work in my zmq 2.1.9 sample application for Windows 7 (x64), but without success.

 For this test I have a PUB/SUB setup between 2 threads.

 // open INPROC socket to communicate with main thread
 m_pInprocSocket = new zmq::socket_t(m_pZMQContext, ZMQ_SUB);
 m_pInprocSocket->connect("inproc://thread_com");
 m_pInprocSocket->setsockopt(ZMQ_SUBSCRIBE, "", 0);

 Then in thread that opened the SUB socket I want to poll, like:

 zmq_pollitem_t pi[] = { m_pInprocSocket, 0, ZMQ_POLLIN, 0 };
 zmq_poll(pi, 1, -1);

 // check INPROC socket
 if (pi[0].revents & ZMQ_POLLIN)
 { ... etc }

 Now, with zmq_poll the ZMQ_POLLIN event is never triggered, but I receive the messages, when I just use recv without polling.

 After stepping into zmq_poll, it seems to be that this is the line where it exits:

 // Build the fd_sets for passing to select ().
 for (int i = 0; i != nitems_; i++) {
 // If the poll item is a 0MQ socket we are interested in input on the
 // notification file descriptor retrieved by the ZMQ_FD socket option.
 if (items_ [i].socket) {
 size_t zmq_fd_size = sizeof (zmq::fd_t);
 zmq::fd_t notify_fd;
 if (zmq_getsockopt (items_ [i].socket, ZMQ_FD, &notify_fd,
 &zmq_fd_size) == -1)
 return -1;


 Does anybody have a tip what this could be?


 Cheers,
 Marko
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.zeromq.org/pipermail/zeromq-dev/attachments/20111004/8a984c38/attachment.htm>