From: storm@cua.dk (Kim F. Storm)
Cc: emacs-devel@gnu.org
Subject: Re: buffering of process output
Date: Sun, 10 Oct 2004 02:08:38 +0200 [thread overview]
Message-ID: <m38yafbfjt.fsf@kfs-l.imdomain.dk> (raw)
In-Reply-To: <20030716.123727.83083338.kazu@iijlab.net> (Kazu Yamamoto (山本和彦)'s message of "Wed, 16 Jul 2003 12:37:27 +0900 (JST)")
I have tried your example on gnu/linux, and I can confirm your
findings for CVS emacs under X. (I don't have 20.7)
But if I try your example with 'emacs -nw', then CVS emacs runs
smoothly too. Wierd!!!
It seems that the difference in buffering in X vs. -nw is in the call
to emacs_read, i.e. in the call to read. But 20.7 seems to do exactly
the same calls.
I have yet to find a sensible explanation why CVS emacs buffers output
differently with X.
So I wonder if X somehow causes read from a pipe to buffer things
differently [line buffering perhaps] (or the pipe to be setup
differently)?
I also tried to do (set-buffer-multibyte nil) before call-process:
- CVS emacs under X becomes much worse (seems to have to collect 16K
output before updating)
- CVS emacs -nw still runs smoothly.
So unibyte/multibyte also kicks in somehow...
Ideas anyone ??
Kazu Yamamoto (山本和彦) <kazu@iijlab.net> writes:
> Emacs 21 has a different behavior of buffering of process output from
> Emacs 20.7.
>
> Evaluate the following in the *scratch* buffer
>
> (call-process "ping" nil t t "localhost")
>
> On Emacs 20.7, each line is smoothly inserted every second.
>
> On Emacs 21.3.50, however, insertion is awkward.
>
> --Kazu
>
> ----
> In GNU Emacs 21.3.50.1 (i386-unknown-netbsdelf1.6T, X toolkit, Xaw3d scroll bars)
> of 2003-07-16 on caster.iij.ad.jp
> configured using `configure '--without-xim' '--prefix=/usr/local/emacs21' 'CFLAGS=-I/usr/pkg/include' 'CPPFLAGS=-I/usr/pkg/include -L/usr/pkg/lib' 'LDFLAGS=-R/usr/pkg/lib -L/usr/pkg/lib -R/usr/X11R6/lib -L/usr/X11R6/lib''
>
--
Kim F. Storm <storm@cua.dk> http://www.cua.dk
next parent reply other threads:[~2004-10-10 0:08 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20030716.123727.83083338.kazu@iijlab.net>
2004-10-10 0:08 ` Kim F. Storm [this message]
2004-10-10 14:09 ` buffering of process output Andreas Schwab
2004-10-10 22:36 ` Kim F. Storm
2004-10-11 8:37 ` Kim F. Storm
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