From: Marc Lehmann <pcg@goof.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Paul Marquis <pmarquis@iname.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: select() bug
Date: Fri, 3 Nov 2000 08:05:24 +0100 [thread overview]
Message-ID: <20001103080524.E29820@fuji.laendle> (raw)
In-Reply-To: <3A01FC44.8A43FE8B@iname.com> <E13rUD4-00026g-00@the-village.bc.nu>
In-Reply-To: <E13rUD4-00026g-00@the-village.bc.nu>; from alan@lxorguk.ukuu.org.uk on Thu, Nov 02, 2000 at 11:55:52PM +0000
On Thu, Nov 02, 2000 at 11:55:52PM +0000, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
> > - If I'm correct that pipes have a 4K kernel buffer, then writing 1
> > byte shouldn't cause this situation, as the buffer is well more than
> > half empty. Is this still a bug?
>
> The pipe code uses totally full/empty. Im not sure why that was chosen
Just a quick guess: maybe because of the POSIX atomicity guarantees (if
select returned, write might have to block which is not what is expected),
and maybe this limitation was used not only on write but on read (Although
it's not necessary on the read side, AFAIK).
--
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---==---(_)__ __ ____ __ Marc Lehmann +--
--==---/ / _ \/ // /\ \/ / pcg@opengroup.org |e|
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The choice of a GNU generation |
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next prev parent reply other threads:[~2000-11-03 7:06 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-11-02 22:11 Paul Marquis
2000-11-02 22:27 ` Alan Cox
2000-11-02 22:42 ` Richard B. Johnson
2000-11-02 22:58 ` Paul Marquis
2000-11-03 0:53 ` Richard B. Johnson
2000-11-03 5:00 ` Paul Marquis
2000-11-03 13:05 ` Richard B. Johnson
2000-11-02 22:53 ` Paul Marquis
2000-11-02 22:58 ` Alan Cox
2000-11-02 23:08 ` Paul Marquis
2000-11-02 23:20 ` Alan Cox
2000-11-02 23:44 ` Paul Marquis
2000-11-02 23:46 ` David S. Miller
2000-11-02 23:52 ` David S. Miller
2000-11-03 0:05 ` David S. Miller
2000-11-03 0:38 ` H. Peter Anvin
2000-11-03 0:13 ` H. Peter Anvin
2000-11-03 0:04 ` H. Peter Anvin
2000-11-02 23:53 ` H. Peter Anvin
2000-11-03 0:01 ` Alan Cox
2000-11-02 23:55 ` Alan Cox
2000-11-03 5:52 ` dean gaudet
2000-11-03 7:05 ` Marc Lehmann [this message]
2000-11-05 16:14 Stanislav Meduna
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