[zeromq-dev] Poll on sockets OR child process

[Michel Pelletier]

But SIGCHILD isn't the only interesting signal here, there may be no
children and you're more interested in registering a handler for some other
signal.

-Michel


On Thu, Dec 19, 2013 at 3:16 PM, Pieter Hintjens <ph at imatix.com> wrote:

> 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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