From: Thomas Dickey <dickey@his.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 17497@debbugs.gnu.org, dickey@his.com
Subject: bug#17497: 24.4.50; TTY menu glitches
Date: Sun, 01 Jun 2014 15:46:00 -0400 [thread overview]
Message-ID: <20140601194600.GA4565@aerie.jexium-island.net> (raw)
In-Reply-To: <834n04bhak.fsf@gnu.org>
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On Sun, Jun 01, 2014 at 09:45:07PM +0300, Eli Zaretskii wrote:
> > Date: Sun, 01 Jun 2014 13:18:17 -0400
> > From: Thomas Dickey <dickey@his.com>
> > Cc: Eli Zaretskii <eliz@gnu.org>, 17497@debbugs.gnu.org
> >
> > What ncurses does when it's getting behind is to drop updates - the
> > typeahead feature:
> >
> > The curses library does ``line-breakout optimization'' by looking for
> > typeahead periodically while updating the screen. If input is found,
> > and it is coming from a tty, the current update is postponed until re-
> > fresh or doupdate is called again. This allows faster response to com-
> > mands typed in advance. Normally, the input FILE pointer passed to
> > newterm, or stdin in the case that initscr was used, will be used to do
> > this typeahead checking. The typeahead routine specifies that the file
> > descriptor fd is to be used to check for typeahead instead. If fd is
> > -1, then no typeahead checking is done.
>
> So buffering output more aggressively could help, is that what you are
> saying?
>
> We currently fflush the stream every 900 bytes and also every 10
> screen lines or so. Does that sound reasonable?
I don't think that will be enough: the output stream simply is not fast
enough to keep up. The typeahead feature is crude, but works. A more
elegant approach (perhaps complicated) would be to keep track of the
changes since the beginning of a repaint, and store _those_ into a
buffer which could be discarded if it is not written before the next
input character is detected.
--
Thomas E. Dickey <dickey@invisible-island.net>
http://invisible-island.net
ftp://invisible-island.net
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next prev parent reply other threads:[~2014-06-01 19:46 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <83vbslbuqr.fsf@gnu.org>
[not found] ` <20140531200947.GA779@aerie.jexium-island.net>
[not found] ` <83lhtgbrd6.fsf@gnu.org>
[not found] ` <20140601152657.GA15078@aerie.jexium-island.net>
2014-06-01 16:25 ` bug#17497: 24.4.50; TTY menu glitches Eli Zaretskii
2014-06-01 17:12 ` Thomas Dickey
2014-06-01 17:18 ` Thomas Dickey
2014-06-01 18:45 ` Eli Zaretskii
2014-06-01 19:46 ` Thomas Dickey [this message]
2014-06-02 15:17 ` Eli Zaretskii
2014-06-02 16:14 ` Glenn Morris
2014-06-02 16:43 ` Eli Zaretskii
2014-06-02 16:46 ` Glenn Morris
2014-06-02 16:56 ` Eli Zaretskii
2014-06-02 17:05 ` Glenn Morris
2014-06-03 13:43 ` Stefan Monnier
2014-06-03 18:47 ` Thomas Dickey
2014-06-03 21:07 ` Eli Zaretskii
2014-06-03 22:21 ` Thomas Dickey
2014-06-04 6:54 ` Eli Zaretskii
2014-06-04 3:03 ` Stefan Monnier
2014-06-04 8:31 ` Thomas Dickey
2014-06-04 9:10 ` Thomas Dickey
2014-06-04 9:38 ` Eli Zaretskii
2014-06-04 10:16 ` Eli Zaretskii
2014-06-04 16:08 ` Glenn Morris
2014-06-04 16:15 ` Eli Zaretskii
2014-06-04 16:09 ` Glenn Morris
2014-06-04 16:23 ` Eli Zaretskii
2014-06-04 17:10 ` Eli Zaretskii
2014-06-04 13:06 ` Stefan Monnier
2014-06-04 20:26 ` Thomas Dickey
2014-06-05 0:47 ` Stefan Monnier
2014-06-05 8:21 ` Thomas Dickey
2014-06-05 8:29 ` Andreas Schwab
2014-06-05 15:02 ` Eli Zaretskii
2014-06-05 13:44 ` Stefan Monnier
2014-06-05 13:47 ` Stefan Monnier
2014-06-05 15:00 ` Eli Zaretskii
2014-06-01 18:39 ` Eli Zaretskii
2014-05-15 12:26 Dmitry Antipov
2014-05-15 17:37 ` Eli Zaretskii
2014-05-16 6:36 ` Glenn Morris
2014-05-16 6:38 ` Glenn Morris
2014-05-16 6:53 ` Glenn Morris
2014-05-16 8:48 ` Eli Zaretskii
2014-05-16 15:47 ` Glenn Morris
2014-05-16 20:21 ` Eli Zaretskii
2014-05-17 9:56 ` Eli Zaretskii
2014-05-22 2:49 ` Eli Zaretskii
2014-05-22 5:44 ` Glenn Morris
2014-05-22 7:51 ` Andreas Schwab
2014-05-22 15:58 ` Glenn Morris
2014-05-22 17:19 ` Andreas Schwab
2014-05-22 17:29 ` Glenn Morris
2014-05-22 17:53 ` Eli Zaretskii
2014-05-22 16:19 ` Eli Zaretskii
2014-05-22 16:26 ` Glenn Morris
2014-05-22 16:46 ` Eli Zaretskii
2014-05-30 9:22 ` Eli Zaretskii
2014-05-31 2:22 ` Glenn Morris
2014-05-31 8:20 ` Eli Zaretskii
2014-05-31 17:35 ` Glenn Morris
2014-06-01 15:11 ` Eli Zaretskii
2014-06-03 4:51 ` Glenn Morris
2014-06-03 7:03 ` Eli Zaretskii
2014-05-22 16:43 ` Eli Zaretskii
2014-05-22 16:54 ` Glenn Morris
2014-05-22 17:07 ` Eli Zaretskii
2014-05-16 9:42 ` Dmitry Antipov
2014-05-16 10:26 ` Eli Zaretskii
2014-05-16 10:46 ` Eli Zaretskii
2014-05-16 14:59 ` Dmitry Antipov
2014-05-16 15:26 ` Eli Zaretskii
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