[zeromq-dev] Can't get ZMQ_REQ_RELAXED to run

Pieter Hintjens ph at imatix.com
Mon Nov 18 09:33:19 CET 2013

Hi Björn,

The best thing when it comes to specific functionalities like this is
a minimal test case that shows the problem.


On Mon, Nov 18, 2013 at 9:09 AM, Björn Kuhlbrodt
<bjoern.kuhlbrodt at gpsolar.com> wrote:
> Hello
> I' trying to use the new (4.0.1) ZMQ_REQ_RELAXED in C++ with VS2010 (and the standard C-Binding from the 0MQ main site), but keep failing.
> What I have:
> One context with two ZMQ_REQ sockets in two different threads, one binds and answers to REQs, one connects and sends REQs. This runs fine and nice until one system crashes before answering a REQ - a known Problem of the REQ-REP.
> What I tried:
> I'm not too eager to kill the context to get the REQ-REP running again, because that would kill my other socket too. The new ZMQ_REQ_RELAXED came in very handy, just fit to solve the problem.
> BUT:
> Now the zmq_msg_send(...)-Method fails to return after a few packages (or even for the first packet) while the client is up and waiting for packages, yes even actively communicating with the server over the other socket. I tried ZMQ_REQ_CORRELATE on and off - doesn't make a change. Tried ZMQ_REQ_RELAXED off again - everything works (except in crash-case).
> So my question:
> Anyone here tried the ZMQ_REQ_RELAXED? Any idea? I'm willing to post code, but I'd need to extract the crucial parts, which could take a while.
> Regards
> Bjorn
> Dr. Björn Kuhlbrodt
> Senior Software Developer
> GP Inspect GmbH
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Pieter Hintjens
CEO of iMatix.com
Founder of ZeroMQ community
blog: http://hintjens.com

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