From: Andreas Schwab <schwab@suse.de>
Cc: "Kazu Yamamoto (山本和彦)" <kazu@iijlab.net>, emacs-devel@gnu.org
Subject: Re: buffering of process output
Date: Sun, 10 Oct 2004 16:09:16 +0200 [thread overview]
Message-ID: <jewtxyvf5f.fsf@sykes.suse.de> (raw)
In-Reply-To: <m38yafbfjt.fsf@kfs-l.imdomain.dk> (Kim F. Storm's message of "Sun, 10 Oct 2004 02:08:38 +0200")
storm@cua.dk (Kim F. Storm) writes:
> 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)?
It doesn't. It's because there is no call to XFlush during the read loop
in call-process. See the comment in xterm.c:
/* Remove calls to XFlush by defining XFlush to an empty replacement.
Calls to XFlush should be unnecessary because the X output buffer
is flushed automatically as needed by calls to XPending,
XNextEvent, or XWindowEvent according to the XFlush man page.
XTread_socket calls XPending. Removing XFlush improves
performance. */
Thus redisplay_preserve_echo_area does not call XFlush any more.
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux AG, Maxfeldstraße 5, 90409 Nürnberg, Germany
Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2004-10-10 14:09 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 ` buffering of process output Kim F. Storm
2004-10-10 14:09 ` Andreas Schwab [this message]
2004-10-10 22:36 ` Kim F. Storm
2004-10-11 8:37 ` Kim F. Storm
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