From: Stefan Monnier <monnier@iro.umontreal.ca>
To: emacs-devel@gnu.org
Subject: Of keyboards and terminals
Date: Sat, 23 Feb 2008 20:30:56 -0500 [thread overview]
Message-ID: <jwv3arjkw4h.fsf-monnier+emacs@gnu.org> (raw)
We currently have a slightly odd situation:
In 99% of the cases, each keyboard object has a single terminal object
and each terminal has a single keyboard. But in some rare cases,
several terminals can share a single keyboard. See the same_x_server
function in xterm.c.
This can be the case when you have different connections to the same
X server. This can happen if you make a frame on unix:0 and then
another frame on localhost:0 and yet another on <myhostname>:0. This is
not very common, tho.
A more significant situation is when you have a multi-screen setup such
that you can make a frame on :0.0 and another on :0.1 and yet another
on :0.2. These *require* separate terminal objects (and separate
X connections).
So in those particular cases, Emacs shares a single keyboard object
between those different terminal objects. The intent of sharing
a single keyboard has mostly to do with the fact that once a command is
started, Emacs is put into "single-keyboard" mode so that all the input
coming from other keyboards is temporarily delayed.
As far as I can tell, this is the only benefit.
The problem is that variables like function-key-map are not
terminal-local (as people often think) but keyboard-local instead.
OTOH they're initialized per-terminal, and there is generally some
confusion between pr-keyboard and per-terminal objects and actions.
So I'm thinking of eliminating the special case that shares the keyboard
among different X11 connections to the same underlying server: the
sharing does make sense, but its benefit doesn't seem to justify the
resulting complexity.
Stefan
next reply other threads:[~2008-02-24 1:30 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-24 1:30 Stefan Monnier [this message]
2008-02-24 22:30 ` Of keyboards and terminals Richard Stallman
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