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Re: quantity in send queue ?
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Re: quantity in send queue ?


  • Subject: Re: quantity in send queue ?
  • From: Justin Walker <email@hidden>
  • Date: Wed, 28 Apr 2004 10:58:16 -0700

On Apr 28, 2004, at 10:46, Nicolas Berloquin wrote:

[snip]
first, thanks for your explaination. All those ramifications are sometimes scary ;-)

That's part of the rush of programming :-}

This is related to my previous discussion about throttling.
If, when I'm about to send some data to a remote peer, I can know that there is still
some data inside its send buffer, then I will postpone my send() until the next loop.
From the way I looked at it, it seems the easiest way to handle my bandwidth problem.

I forget - is this TCP or UDP? Trying to outsmart TCP is a waste of effort, and generally doesn't do what you want. If it's UDP, no data is stored in socket buffers - either it gets sent, or it gets dropped, down in the driver layer.

But maybe I could achieve this by setting the send window size by hand to the amount
previously sent and therefore expecting a EWOULDBLOCK if the data wasn't already sent.
Otherwise, all the 65k are filled and I never know when they are really sent to the peer.

You can't set the send window. That's done by the remote side.

The best you can do is to 'test' the status of the TCP connection by putting the socket in non-blocking mode and using select if you get EWOULDBLOCK. Control returns when the window is opened. Is that what you mean in your remark about EWOULDBLOCK?.

You could, as an alternative, use non-blocking mode and poll, but that is ugly and bad citizenship.

Regards,

Justin

--
Justin C. Walker, Curmudgeon-At-Large *
Institute for General Semantics | If you're not confused,
| You're not paying attention
*--------------------------------------*-------------------------------*
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  • Follow-Ups:
    • Re: quantity in send queue ?
      • From: Nicolas Berloquin <email@hidden>
References: 
 >quantity in send queue ? (From: Nicolas Berloquin <email@hidden>)
 >Re: quantity in send queue ? (From: Justin Walker <email@hidden>)
 >Re: quantity in send queue ? (From: Nicolas Berloquin <email@hidden>)

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