[nanomsg] Re: AF_SP_RAW vs AF_SP
- From: Martin Sustrik <sustrik@xxxxxxxxxx>
- To: nanomsg@xxxxxxxxxxxxx
- Date: Mon, 05 May 2014 12:07:24 +0200
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For understanding how it works, read the REQ/REP RFC:
https://raw.githubusercontent.com/nanomsg/nanomsg/master/rfc/sp-request-reply-01.txt
However, as a user you can use the rule of thumb: Use standard sockets
if you are going to use the socket yourself. Use RAW sockets to be
passed to nn_device().
Martin
On 05/05/14 11:39, Drew Crawford wrote:
> The documentation says
>
>> Raw sockets omit the end-to-end functionality found in AF_SP
>> sockets and thus can be used to implement intermediary devices in
>> SP topologies.
>
> What exactly does this “end-to-end functionality” that is omitted
> consist of? I have grepped the source code to try and understand
> the effect of AF_SP_RAW and it’s not immediately clear.
>
> One thing I have noticed is that recv doesn’t seem to work on raw
> sockets. The following code hangs indefinitely when use_raw =
> True:
>
>> import nanomsg use_raw = True router =
>> nanomsg.Socket(domain=nanomsg.AF_SP_RAW if use_raw else
>> nanomsg.AF_SP, protocol=nanomsg.REP) debug =
>> nanomsg.Socket(domain=nanomsg.AF_SP, protocol=nanomsg.REQ)
>> router.bind("tcp://0.0.0.0:55555")
>> debug.connect("tcp://localhost:55555")
>>
>>
>> def client(): while True: debug.send("ping") print(debug.recv())
>>
>> import threading thread = threading.Thread(target=client)
>> thread.start()
>>
>> while True: print(router.recv()) router.send("pong")
>
>
> The difference in behavior for raw sockets that causes this
> behavior is not immediately clear.
>
> Drew
>
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