[zeromq-dev] Send queue after socket close

[Lindley French]

I'm using zmqpp, which in turn appears to use the libzmq API.

I'm still not sure exactly what was going on, but the THANKS message
approach seems to have fixed the immediate problem.


On Tue, Jan 14, 2014 at 10:07 AM, Pieter Hintjens <ph at imatix.com> wrote:

> Ah, the default is indeed -1, meaning infinite linger, and no message loss.
>
> If you use CZMQ it defaults to 0.
>
> Are you using CZMQ or the native C API? The DEALER close should wait
> until all messages are sent.
>
> Still, I'd not trust it; even "sent" can mean "delivered to socket
> layer but still in transit".
>
> -Pieter
>
> On Tue, Jan 14, 2014 at 3:29 PM, Lindley French <lindleyf at gmail.com>
> wrote:
> > Perhaps I misinterpreted this sentence on the zmq_close() page:
> > "The default setting of ZMQ_LINGER does not discard unsent messages"
> >
> >
> > On Tue, Jan 14, 2014 at 8:47 AM, Pieter Hintjens <ph at imatix.com> wrote:
> >>
> >> On Tue, Jan 14, 2014 at 12:34 PM, Lindley French <lindleyf at gmail.com>
> >> wrote:
> >>
> >> > According to the docs, by default if a socket is closed, its send
> queue
> >> > will
> >> > still be sent. However, the behavior I'm seeing casts some doubt on
> >> > this.
> >>
> >> Where is this stated? Afaik the socket pipes (with messages) are
> >> destroyed when the socket is destroyed, which will wait for the LINGER
> >> time set on that socket, if there are messages waiting to be sent.
> >>
> >> > One practical solution would be for the ROUTER to send back a "THANKS"
> >> > message to the DEALER once it has everything, and not allow the socket
> >> > to
> >> > close until then. I would like to understand the subtleties of the
> >> > implementation, though.
> >>
> >> Indeed, that's what you'd want to do. Closing the socket will drop an
> >> undefined messages in flight unless you set infinite linger, which can
> >> lead to your application blocking.
> >>
> >> -Pieter
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> >
> >
> >
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