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Re: Unbuffered socket I/O

From: Kevin Ryde
Subject: Re: Unbuffered socket I/O
Date: Thu, 01 Mar 2007 08:24:51 +1100
User-agent: Gnus/5.110006 (No Gnus v0.6) Emacs/21.4 (gnu/linux)

address@hidden (Ludovic Courtès) writes:
>            (uniform-vector-read! vec port)))

Slackness in the implementation of that function.  It knows a size to
read and should come out as a read() system call of that size.  Yet it
always goes through the port buffer.  You need to post the problem
instead of leaping to a "solution".

read-string!/partial is much better in that respect.  Maybe that func
should be loosened up to work on non-fports too, that could be nice.

It's a bit of a failing of the ptab port functions that there's no
"read N bytes", but that needn't prevent uniform-vector-read! doing
the right thing on fports.

Could think about whether it ought to make multiple calls to fill the
requested size.  I guess that's how it is now, in effect, so probably
yes.  Could also think if those calls should then cope with O_NONBLOCK
too, by sleeping in select() if finding there's nothing to read yet.
On a single read call I would say let it throw an error, but if the
aim is to block until the requested size then it's easy enough to

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