[zeromq-dev] Newbie Bait Request: Debug "Warning" mechanism.
ph at imatix.com
Tue Aug 17 15:26:57 CEST 2010
On Tue, Aug 17, 2010 at 3:14 PM, Matt Weinstein
<matt_weinstein at yahoo.com> wrote:
> You're right, and I can't find it.
> Basically, you could be waiting for ETERM, but I forget the other case.
I think it was a subscriber that dynamically adds/remove filters and
at some point ends up with no filters. But that's a broken use case
because if code ever ends in that state it won't exit the recv().
Martin also mentioned waiting for ETERM but it seems nasty to use a
SUB socket for that and especially to allow this trap to exist simply
to support that use case.
My suggestion: if code calls zmq_recv() without NOBLOCK on a SUB
socket with no filters, 0MQ asserts.
As a secondary suggestion, the null/block case turns into "subscribe
to EVERYTHING" which is what 100% of people want when they naively
write code and omit the filter.
Yesterday I spent 30 minutes wondering why my subscriber wasn't
working. Facepalm... but it just should not require additional effort
to make the simplest possible case work.
iMatix - www.imatix.com
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