[zeromq-dev] ZMQ_STREAM with inproc ?

Laurent Alebarde l.alebarde at free.fr
Mon Feb 10 17:38:44 CET 2014


Le 10/02/2014 11:12, Goswin von Brederlow a écrit :
> On Sun, Feb 09, 2014 at 12:16:48AM +0100, Laurent Alebarde wrote:
>> When I replace the tcp address "tcp://127.0.0.1:5556" with an
>> *inproc* one, say "inproc://testStream", in /tests/test_stream.cpp/,
>> the test fails. It asserts on
>>
>> rc = zmq_recv (stream, buffer, 255, 0);
>>      assert (rc == 0);
>>
>> The documentation for sockets says: "/A socket of type 'ZMQ_STREAM'
>> is used to send and receive TCP data from a //
>> //non-0MQ peer, when using the tcp:// transport/.", so, possibly the
>> cases other than tcp are not valid ?
>>
>> If the answer is positive, I think it should assert as soon as the
>> socket  binds or connects to a none tcp address.
> Please don't assert. return an error. An application can never handle
> an assert and give a good error, like e.g "Wrong transport type
> specified in conffile".
If ZMQ_STREAM can work only with the tcp transport, I don't see what 
kind of handling the application could do when a ZMQ_STREAM socket is 
connected or binded to an illegal transport ?
>
>> As ZMQ_STREAM has a raw behaviour, it is interesting for many
>> things. It would be nice to be able to use the other transports with
>> it.
> It might be nice to use udp or multicast. Does that work? Maybe even
> ipc.
>
> But I fail to see the use case for inproc. For other transport types
> there is a boxing of messages for the on-wire protocol. But inproc has
> no on-wire. It directly puts the send message into the recievers pipe.
> So saying you don't want any boxing of the data makes no sense to me.
What lacks for me is a real raw socket type working on any transport.
>
> MfG
> 	Goswin
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