Dear Robert, all,
maybe I was not clear enough (although irrelevant for this question),
but let me clarify: I have a full set of applications based on zmq
(specifically the C++ bindings, which I really like) connecting around
3200 processes which each other. The final application in the pipeline
has to speak with a legacy application which I can not change (I can not
just port it to zmq). In principle I could just use a standard tcp
socket for this connection, but It would be so much nicer in my
implementation if this is also a zmq socket...
I certainly do not want to "re-write zeromq"! :-)
The final application in the pipeline understands zmq on one side (with
all its benefits) and (after some internal stuff) dumps data to the
legacy application (without the benefits).
Anyways, my question was really more about the definition/meaning of
POLLOUT for ZMQ_STREAM sockets.
Best,
Nils
On 10.07.19 19:31, Bob Eby wrote:
Dear Nils,
I would like to connect my ZeroMQ application with a
non-zeromq one via a ZMQ_STREAM socket type.
I think, in my way of looking at it, that you wouldn't be connecting
to a non-zeromq application. Instead, you'd be writing your own
implementation of the zeromq protocol in order to communicate with the
zeromq library over (part of) the zeromq protocol.
Why would you need to re-write zeromq? Certainly, it will be
educational... But I'm not sure I could recommend this scenario in
any conceivable production setting.
Is it possible to test if the socket is writable and a send
would not block via the usage of poll (with POLLOUT)?
I've really only used REQ / REP with DEALER / BROKER myself. I can
say that in my configuration ZeroMQ will definitely block on certain
calls. Most notably, all data must be completely sent before the
remote side will begin reading any result. I think this is partly
fundamental to how "queuing" works in ZeroMQ. Some level of data
chunk will always be fully completed and secured (usually at message
level) before the remote end can begin to dequeue that chunk.
Someone please correct me if I'm wrong here. I have not read the code!
Good luck with your configuration,
Robert E.
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