[Freeswitch-dev] Share data between modules

Thu Oct 18 20:14:35 MSD 2012

ZMQ and FS are never going to work well....

There are many problems such as, any call to fork in FS like when it execs
the system commands or tries to email a VM results in segs.

ZMQ has a firm belief in no mutexes and sockets for threads to do
interprocess communication.  I don't have anything against that but it does
not match the FS philosophy at all.

All that aside,

mod_event_zmq sends only events  if you want to send data from a module via
that, just create and fire an event.

On Thu, Oct 18, 2012 at 9:07 AM, João Mesquita <jmesquita at freeswitch.org>wrote:

> I guess a solution would be to re queue the events again and pop on the
> thread that owns the ZMQ context. Shouldn't be too hard although there
> would be locking problems on the queue.
>
> Regards,
> JM
>
> Sent from my iPhone
>
> On Oct 17, 2012, at 8:52 AM, Peter Olsson <
> peter.olsson at visionutveckling.se> wrote:
>
>  I believe the threading model in zmq is different, that it really
> doesn’t work well together with FreeSWITCH’s threading model.****
>
> ** **
>
> If I’ve understood this correctly, for instance when you send a message
> using zmq, the library takes for granted that this is always done from the
> same thread. However, inside FS it means it might be sent from different
> threads, since the event system inside FS has multiple threads to pop the
> queued events.****
>
> ** **
>
> Tony, probably has a more correct description – I’ve never even used zmq
> myself :)****
>
> ** **
>
> /Peter****
>
> ** **
>
> *Från:* freeswitch-dev-bounces at lists.freeswitch.org [
> mailto:freeswitch-dev-bounces at lists.freeswitch.org<freeswitch-dev-bounces at lists.freeswitch.org>]
> *För *Juan Antonio Ibañez Santorum
> *Skickat:* den 17 oktober 2012 13:37
> *Till:* freeswitch-dev at lists.freeswitch.org
> *Ämne:* Re: [Freeswitch-dev] Share data between modules****
>
> ** **
>
> Any idea to improve it? ****
>
> 2012/10/16 Anthony Minessale <anthony.minessale at gmail.com>****
>
> You should do that by firing events from your module so they are delivered
> via mode_event_zmq.****
>
> Beware zmq is unstable in FS because its a threaded app and zmq is a
> different threading model.****
>
> ** **
>
> On Tue, Oct 16, 2012 at 3:44 PM, Juan Antonio Ibañez Santorum <
> juanito1982 at gmail.com> wrote:****
>
> The idea is to get some internal data from an own module to be served via
> mod_event_zmq.****
>
> ** **
>
> Regards****
>
> ** **
>
> ** **
>
> ** **
>
> 2012/10/16 Anthony Minessale <anthony.minessale at gmail.com>****
>
> Can you provide context on which 2 modules you want to do this with?****
>
> Its not a good design to allow loadable modules to require symbols from
> each other.****
>
> ** **
>
> On Tue, Oct 16, 2012 at 12:48 PM, Juan Antonio Ibañez Santorum <
> juanito1982 at gmail.com> wrote:****
>
> Do you refer to mod_hash? How can I call its API functions from another
> module? Is it possible to save C data structures, not only stirng values?*
> ***
>
> ** **
>
> Regards****
>
> ** **
>
> 2012/10/16 Mitch Capper <mitch.capper at gmail.com>****
>
> Check out the hash api it can do exactly what you want, suggest
> prefixing all your entries to keep it clean and avoid conflicts.
>
> ~Mitch****
>
>
> On Tue, Oct 16, 2012 at 8:45 AM, Juan Antonio Ibañez Santorum
> <juanito1982 at gmail.com> wrote:
> > Hello,
> >
> >    Is there any way to share data (as a hash) between modules? I can see
> > switch_core_set_variable() function but I think it cannot be used for
> that
> > purpose.
> >
> > Regards
> >****
>
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-- 
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