[zeromq-dev] Check if forwarder is running

[Michel Pelletier]

Signals are a unix concept.  Not that I would know, but I'm guessing
there is some funkyness with the way python signals work on Windows as
this blog post implies:

http://danielkaes.wordpress.com/2009/06/04/how-to-catch-kill-events-with-python/

"In the Linux world catching “kill events” would be a simple task, to
shut down another program a process just has to send a SIGTERM signal
which can be caught be Python easily using the signal module which
comes with every Python installation. However, on Windows things are a
little bit harder, because the operating system never produces SIGTERM
(and SIGILL) events according to the signal.h documentation from
MSDN."

Remove all the zmq code entirely from your example and reproduce the
most minimal signal handler that prints on signal and I bet it still
won't work.

You might want to look into the atexit module:

http://docs.python.org/library/atexit.html


On Tue, Mar 20, 2012 at 9:14 PM, Ronald Swain <proj_symbian at live.com> wrote:
> Hmmm i tried using your code but , its not working too. :-(
>
> Regarding PyZMQ version i am using pyzmq 2.1.11 which have same version of
> libzmq i guess. And i am on a 64 bit windows machine.
>
> ________________________________
> Date: Tue, 20 Mar 2012 12:44:57 -0500
>
> From: cornelius.toole at gmail.com
> To: zeromq-dev at lists.zeromq.org
> Subject: Re: [zeromq-dev] Check if forwarder is running
>
> I forked and edited the gist with my changes and comments. I'm not really
> sure what's wrong, but you may be having a scope
> problem: https://gist.github.com/2138347
> http://stackoverflow.com/questions/423379/using-global-variables-in-a-function-other-than-the-one-that-created-them
>
>
> incoming, outgoing and context are visible within
> the termSignalHandler function, you need to add a global statement at the
> beginning of your function definitions, like so:global incoming, outgoing,
> context
>
> What version of pyzmq, libzmq are you using?
>
>
> --
> Cornelius Toole
> Sent with Sparrow
>
> On Tuesday, March 20, 2012 at 12:13 PM, Ronald Swain wrote:
>
> Hello Cornelius ,
>
> Thanks again and it will work for sure.
>
> Next and probably last question is why my sockets are not cleaned up in the
> forwarder, i try something like https://gist.github.com/2132163 but the
> handler is never fired.
>
> just to inform you i kill the python interpreter to close the forwarder.
>
>
>
> ________________________________
> Date: Tue, 20 Mar 2012 10:09:04 -0500
> From: cornelius.toole at gmail.com
> To: zeromq-dev at lists.zeromq.org
> Subject: Re: [zeromq-dev] Check if forwarder is running
>
> Ronald,
>
> Do i need to close forwarder again and than start after each message sent by
> the publisher, or can i do something like i can start the forwarder first
> and next publisher check if the forwarder is running than just leverage the
> forwarder to send some messages to the subscriber.
>
> No you just leave the forwarder running. That's the magic of using a
> forwarder with pub-sub sockets. But you should probably change how the
> forwarder device is configured. The way I use the forwarder is to have it
> bind both the incoming and outgoing sockets and then have the producers and
> consumers connect to the forwarder; that way once the forwarder is running,
> producer and consumer processes can start and stop without crashing the
> other.
> See: https://gist.github.com/2136666#comments
>
>
> --
> Cornelius Toole
> Sent with Sparrow
>
> On Tuesday, March 20, 2012 at 4:35 AM, Symbian Projects wrote:
>
> Hello All,
>
> In one of my past threads i got the zmq device forwarder working, now my
> exact use case is like i have arbitrary no of publishers and subscribers.
>
> First i start the ZMQ forwarder device, than i am starting the subscribers
> and than a single publisher to send the message.
>
> My objective is there are no of publishers who  should be able to send
> messages to the connected subscribers, now how this can happen with a
> FORWARDER.
>
> Do i need to close forwarder again and than start after each message sent by
> the publisher, or can i do something like i can start the forwarder first
> and next publisher check if the forwarder is running than just leverage the
> forwarder to send some messages to the subscriber.
>
> I hope my question is clear.
>
> Thanks a Lot for reply.
> Ronald
>
>
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