[zeromq-dev] ZMQ_SERVER blocks on send() rather than returning EAGAIN

Doron Somech somdoron at gmail.com
Mon Apr 4 13:01:03 CEST 2016


In the end, the For procrssing outgoing messages, the bullet " SHALL NOT
block on sending." Is incorrect. Shell block, shloud not block if DONT WAIT
is used
On Apr 4, 2016 13:40, "Pieter Hintjens" <ph at imatix.com> wrote:

> Doron, we need to fix the man page then. Can you read the RFC
> http://rfc.zeromq.org/spec:41 and tell me which pieces exactly are
> incorrect? I'll do the rest.
>
> On Mon, Apr 4, 2016 at 10:04 AM, Doron Somech <somdoron at gmail.com> wrote:
> > You have to specify ZMQ_DONT_WAIT for the send method to return eagain
> > instead of blocking.
> >
> > On Mon, Apr 4, 2016 at 5:31 AM, Robert Holterhoff <datax1969 at gmail.com>
> > wrote:
> >>
> >> I'm using the "unstable" 4.2.0 release and have a question regarding
> >> ZMQ_SERVER sockets.
> >>
> >> The documentation suggests that ZMQ_SERVER sockets will not block but
> >> return EAGAIN when the HWM is reached.  I am finding that the send()
> >> blocks instead.
> >>
> >> Actually, this is exactly the behaviour I want so I'm not complaining.
> My
> >> app works beautifully, running at full rate, quickly filling up various
> >> clients queues and then automatically rate-limiting to the slowest
> client
> >> because of the blocking behaviour.
> >>
> >> However, I made the observation that the "back-off" part of the code
> which
> >> I had written expecting EGAIN to be returned is never exercised.
> >>
> >> I just want to know if I can rely on this behaviour in the future so I
> can
> >> remove my hacky arbitrary "sleep-for-a-bit back-off" code, or if this
> is a
> >> bug because SERVER/CLIENT sockets are still in their infancy.
> >>
> >> Thanks,
> >>
> >> Rob Holterhoff
> >>
> >>
> >> _______________________________________________
> >> zeromq-dev mailing list
> >> zeromq-dev at lists.zeromq.org
> >> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
> >
> >
> >
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> >
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