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Date: Fri, 22 Jun 2007 23:55:42 +0200
From: Philippe Anel <xigh@free.fr>
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To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] About 9P ...
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Ok I agree ... as long as you don't expect the replies to be returned
in the same order as the requests, requests can be pipelined.

Therefore, now it makes sense to have FIDs chosen by the client.

Thank you.

>
> Well you may have a point, but why not
>
> 1. send: open, fid, file
> 2. wait for reply to 1.
> 3. send read, fid, args
> 4. send read, fid, args
> 5. wait for either...
> 6. wait for remaining?
>
> At that point you're still pipelining, and since you're reading
> presumably into separate buffers, or different locations in the same
> buffer, who cares about the order?
>
>
>
>     Because all transactions are tagged ... this wouldn't break
>     9P. However, this doesn't work as expected.
>
>
>
> Depends on what's expected :-)
>
>
>     That's why I think 9P was not designed to allow this. But
>     maybe I'm wrong.
>
>
>
> It's probably designed to allow what I just said, you can sequence
> some operations, but then things that don't need to be sequenced could
> be pipelined.
>
> Different servers may behave differently, 9P makes no guarantee AFAIK.
>
> Dave
>
>
>     Phil;
>
>
>
>
>
> --
> - Passage Matthew 5:37:
>    But let your communication be, Yea, yea; Nay, nay: for whatsoever
> is more than these cometh of evil.