[zeromq-dev] zmq_poll: timeout issue

Matt Weinstein matt_weinstein at yahoo.com
Tue Aug 10 16:07:19 CEST 2010

This is the same problem as pthread condition variables have, e.g.:


Just think of the revents as condition variables to check...

Does someone want to write a quick wrapper ?

PS I recommend CLOCK_MONOTONIC, but it may not be available, and  
requires -lrt ...

On Aug 10, 2010, at 9:39 AM, Martin Lucina wrote:

> Hi,
> ilejncs at narod.ru said:
>> I am observing rather strange zmq_poll behavior.
>> It is triggered by timeout and works fine if  -1.
> This is a known issue with the current zmq_poll() implementation. The
> zmq_poll(3) documentation mentions this, albeit briefly:
>    Important
>        The zmq_poll() function may return before the timeout period  
> has
>        expired even if no events have been signaled.
> The solution at the moment is either to use an infinite timeout, or  
> manage
> the timeout yourself (i.e. call gettimeofday(), recalculate remaining
> timeout and restart the zmq_poll()).
> There is a work in progress branch of the code not ready for public
> consumption yet which will contain a new zmq_poll() implementation  
> with
> proper timeout handling.
> -mato
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