[zeromq-dev] zmq_poll when socket is closed

[KIU Shueng Chuan]

I didn't run your example but isn't the zmq_poll() call going to return
immediately before the 5 seconds are up?

POLLOUT indicates writability which is true for zmq sockets until the hwm
is reached.
On 13 Oct 2015 23:50, "Auer, Jens" <jens.auer at cgi.com> wrote:

> Hi,
>
> what is the semantics of zmq_poll when the remote side of the socket is
> closed? My sample program
> int main()
> {
>     zmq::context_t ctx;
>     zmq::socket_t s1{ctx, ZMQ_PAIR};
>     zmq::socket_t s2{ctx, ZMQ_PAIR};
>
>     s1.bind("inproc://1");
>     s2.connect("inproc://1");
>
>     auto t = std::thread( [&]() {
>         std::this_thread::sleep_for( std::chrono::seconds(5) );
>         s1.close();
>     });
>
>     zmq::pollitem_t pollitems[] = { {static_cast<void*>(s2), -1,
> ZMQ_POLLIN + ZMQ_POLLERR + ZMQ_POLLOUT, 0} };
>
>     auto rc = zmq::poll(pollitems, 1);
>
>     std::cout << rc << std::endl;
>     std::cout << pollitems[0].revents;
>
>     t.join();
>
>     return 0;
> }
>
> prints 2 which is ZMQ_POLLOUT. However, I cannot see this in the
> documentation.
>
> Best wishes,
>   Jens
>
> --
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