[zeromq-dev] Setting RcvTimeout or polling with a timeout value?

[Pieter Hintjens]

There are a few reasons I don't like the timeout approach, and don't teach it.

First, it only works when you are working with a single socket and if
you want to add a second one, you have to redesign your code, which is
a bad way to make code.

Second, it's a polling approach (ironically, zmq_poll is actually a
more event-driven approach), and leads to poor designs.

When you use zmq_poll, your code tends to be clean, and scalable.

-Pieter

On Fri, Feb 1, 2013 at 1:13 PM, Balázs Varga <bb.varga at gmail.com> wrote:
> Hello,
>
> If somebody want to set a timeout when receiving from a socket, there are
> two approaches:
>
> 1. setting ZMQ_RCVTIMEO socket options and call zmq_recv()  which will set
> error EAGAIN, if there's nothing in the queue
>
> and
>
> 2. polling the socket with a given timeout?
>
> zmq_pollitem_t items [] = { { socket,  0, ZMQ_POLLIN, 0 } };
> int rc = zmq_poll (items, 1, timeout * ZMQ_POLL_MSEC);
>
> which will return 0 if nothing to receive.
>
> In the guide I see that the second method is widely used, however as I
> remember I haven't met with the 1st approach. why is this, is it just a
> choice, or are there any performance or other differences?
>
> thx
>
> b.
>
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