[zeromq-dev] czmq zloop timers and setting system time

[Pieter Hintjens]

Sounds like a good improvement... I'd say go for it.

On Wed, Jul 23, 2014 at 4:53 AM, Matt Spencer <spencemt at gmail.com> wrote:
> Hi,
>
> I've got an application that is using czmq.  One of the use cases for the
> application is to set the system time.  I've found that when the system time
> is set back in time, the zloop timers stop triggering until the system time
> reaches its previous setting.
>
> Looking at the zloop and zclock implementations, it seems that the zloop
> timers are based on absolute time (zclock_time, which calls gettimeofday),
> which explains what i'm seeing.
>
> I would like to propose using a monotonic timer (either within zclock_time,
> or creating a new monotonic time interface) for the zloop timers, since the
> triggering logic is only computing time differences.  The core libzmq
> library seems to handle system time changes just fine in its polling
> timeouts.
>
> I actually have an implementation of czmq using a monotonic time that is
> working on Linux (the built in test work at least).  I would like to hear
> feedback on this idea.  I would like to provide the patch for this, but I
> also need to do some work on the Windows side first.
>
> Any thoughts?  This would be my fist contribution.
>
> Thanks,
> Matt
>
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