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Re: [SCTP-Discussion] Unordered delivery and blocking-mode in sctpsocket-API


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  • From: Michael Tüxen <Michael.Tuexen AT micmac.franken.de>
  • To: Andreas Jungmaier <ajung AT exp-math.uni-essen.de>
  • Cc: Torbjörn Andersson <torbjorn.andersson AT kau.se>, <discussion AT sctp.de>
  • Subject: Re: [SCTP-Discussion] Unordered delivery and blocking-mode in sctpsocket-API
  • Date: Tue Sep 23 23:07:02 2003
  • List-id: SCTP Discussions <discussion.sctp.de>
Hi all,

a sending call is blocked iff there is not enough buffer space available.

It does NOT matter if the transport layer really sends the data due
to retransmission, receiver window and so on. Especially it
does not matter if the data is sent unordered or ordered.

Best regards
Michael

On Monday, Sep 22, 2003, at 12:24 Europe/Berlin, Andreas Jungmaier wrote:

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On Monday 22 September 2003 10:54, Torbjörn Andersson wrote:
Hello.

I'm using sctplib-1.0.0-rc1.tar.gz and socketapi-1.3.1.tar.gz and have
problem with sending unordered messages.

Does a "blocking socket" block when unordered messages are sent with
sendmsg()?

My tests indicate that it don't. Is this the normal behaviour or is it a
fault in the socket-api?

Hello Torbjörn,

thanks for reporting this bug. I am pretty sure that the socket *should*
block, if either cwnd or rwnd do not allow sending the message at once !

Can you please say a little more about your tests ? In which conditions does
the socket NOT block (i.e. what about oustanding bytes, cwnd, rwnd) ?

Anyway, I will discuss this issue with Thomas, and we report back to
the list. Stay tuned !

Best regards,
Andreas

- --
Dipl.-Ing. Andreas Jungmaier
Computer Networking Technology Group
University of Duisburg-Essen
http://www.exp-math.uni-essen.de/~ajung
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