From: Adriano Verardo <a.verardo@tecmav.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] 9P2000 and p9p
Date: Tue, 10 Apr 2007 20:14:41 +0200 [thread overview]
Message-ID: <461BD411.9020107@tecmav.com> (raw)
In-Reply-To: <466d420c1351988780ba61464ddf782e@terzarima.net>
Charles Forsyth wrote:
>>Why the client always sends a second Tread request ?
>>If the Rread returned 281/8192 bytes and the msize is > 8192 it should
>>be clear that there is no other data to read.
>
>
> no, because in general data can be returned as discrete messages (or records) of
> different sizes. for instance with /net/cs and /net/dns each read returns a single
> recipe for making a connection or a single translation of a name.
> it's true on unix too: think of a magnetic tape drive (probably you can a description
> in wikipedia if you never saw one).
>
>
Unfortunately I don't need the Wikipedia (first prog in 1975, Univac CII
10070, punched cards, ...). Nothing to be proud of, I would prefer to be
25 :-)
Could a EOD field in Rread be useful ? In some cases it would avoid
a lot of messages. I think a very small servers (mController) and low
channels.
Adriano
next prev parent reply other threads:[~2007-04-10 18:14 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-10 17:12 Adriano Verardo
2007-04-10 17:39 ` Charles Forsyth
2007-04-10 18:14 ` Adriano Verardo [this message]
2007-04-10 19:33 ` C H Forsyth
2007-04-10 21:28 ` Adriano Verardo
2007-04-10 18:29 ` Russ Cox
2007-04-10 22:14 ` Adriano Verardo
2007-04-10 22:38 ` Charles Forsyth
2007-04-10 22:50 ` Russ Cox
2007-04-11 2:19 ` Adriano Verardo
2007-04-11 2:55 ` erik quanstrom
2007-04-11 3:10 ` Russ Cox
2007-04-11 6:58 ` Bruce Ellis
2007-04-11 8:20 ` Charles Forsyth
2007-04-11 15:38 ` ron minnich
2007-04-11 2:50 ` Kris Maglione
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