[zeromq-dev] Poll on sockets OR child process

[Pieter Hintjens]

I think it needs to be part of a process creation class, zproc or
somesuch; the cleanest way IMO to report events from child processes
is via ZeroMQ messages in any case. We do this in other classes which
use a message-based API.

On Thu, Dec 19, 2013 at 10:18 PM, Michel Pelletier
<pelletier.michel at gmail.com> wrote:
> It seems like this is something that could be appropriately added to zloop?
> A signal registration function that internally added a signalfd an called a
> handler.
>
> -Michel
>
>
> On Thu, Dec 19, 2013 at 12:36 PM, Pieter Hintjens <ph at imatix.com> wrote:
>>
>> Hi Greg,
>>
>> This is nice stuff. Process management is one of the incomplete areas.
>> If I was doing this in CZMQ, I'd have a class that managed child
>> processes and sent events (DIED, ENDED) back to the parent over a
>> pipe.
>>
>> -Pieter
>>
>>
>> On Wed, Dec 18, 2013 at 3:33 PM, Greg Ward <greg at gerg.ca> wrote:
>> > On 27 November 2013, I said:
>> >> I'm hacking on a task distribution system used internally here. It has
>> >> N masters sending tasks (shell commands) out to M workers, and then
>> >> doing stuff with the results. There's something that annoys me
>> >> slightly about the implementation: the worker runs each task in a
>> >> separate thread.
>> >>
>> >> IMHO it would be ever so much nicer to just spawn the child process
>> >> that runs a task, and harvest the results when they are ready. IOW, I
>> >> want to integrate wait() and zmq_poll() in a single event loop.
>> >
>> > Thanks again to Michael Haberle for the tips. Since this was
>> > non-obvious to me, I assume it will be non-obvious to others in
>> > future. So I made several working examples and wrote up a blog post:
>> >
>> >   http://gerg.ca/blog/post/2013/zmq-child-process/
>> >
>> > Comments/criticisms are welcome.
>> >
>> >        Greg
>> > --
>> > Greg Ward                            http://www.gerg.ca
>> > <greg at gerg.ca>                       @gergdotca
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