From: Stefan Monnier <monnier@iro.umontreal.ca>
To: phillip.lord@russet.org.uk (Phillip Lord)
Cc: Emacs-Devel devel <emacs-devel@gnu.org>
Subject: Re: undo refactoring
Date: Tue, 05 Jul 2016 17:50:28 -0400 [thread overview]
Message-ID: <jwvwpkz69r4.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <8760skcw09.fsf_-_@russet.org.uk> (Phillip Lord's message of "Tue, 05 Jul 2016 09:46:46 +0100")
> Why not just do
> bset_undo_list (current_buffer,
> Fcons (Qnil, BVAR (current_buffer, undo_list)));
> and remove all references to pending_boundary (and therefore
> `prepare_record` which is now rather badly named)? Or am I missing
> something
IIUC, the reason for this was so as to avoid an inf-loop when malloc
fails (for lack of memory).
The particular issue was that it was OK for a command to fail because of
malloc failure, but it was not OK for the read-eval-loop itself to fail
before having the opportunity to run another command.
My impression is that this design goal has been ignored for much too
long, so I don't think Emacs behaves this way any more. And instead we
have now other ways to handle the memory-full situation (such as the
extra memory that's pre-allocated and then released in case the memory
is full).
IOW, I'd be surprised if getting rid of this quirk would ever lead to
a visible change in Emacs's behavior nowadays.
Stefan
next prev parent reply other threads:[~2016-07-05 21:50 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-29 21:47 bug#23871: 25.1.50; Undo unexpectedly leads to blank buffer Markus Triska
2016-06-30 16:38 ` Eli Zaretskii
2016-06-30 18:00 ` Markus Triska
2016-06-30 18:21 ` Eli Zaretskii
2016-06-30 18:52 ` Eli Zaretskii
2016-06-30 21:45 ` Phillip Lord
2016-07-01 6:31 ` Markus Triska
2016-07-01 7:25 ` Eli Zaretskii
2016-07-01 14:04 ` Phillip Lord
2016-07-01 20:38 ` Markus Triska
2016-07-01 22:12 ` Phillip Lord
2016-07-01 20:49 ` Markus Triska
2016-07-01 22:21 ` Phillip Lord
2016-07-02 5:35 ` Markus Triska
2016-07-02 7:35 ` Eli Zaretskii
2016-07-02 20:21 ` Phillip Lord
2016-07-02 20:53 ` Markus Triska
2016-07-03 3:33 ` Eli Zaretskii
2016-07-03 9:37 ` Phillip Lord
2016-07-03 10:08 ` Markus Triska
2016-07-03 12:55 ` Phillip Lord
2016-07-03 15:30 ` Eli Zaretskii
2016-07-03 20:21 ` Phillip Lord
2016-07-03 18:05 ` Markus Triska
2016-07-03 20:23 ` Phillip Lord
2016-07-03 22:03 ` Markus Triska
2016-07-04 14:38 ` Eli Zaretskii
2016-07-05 16:36 ` Eli Zaretskii
2016-07-05 19:44 ` Phillip Lord
2016-07-05 20:02 ` Markus Triska
2016-07-05 19:47 ` Markus Triska
2016-07-05 20:00 ` Eli Zaretskii
2016-07-03 15:12 ` Eli Zaretskii
2016-07-03 18:09 ` Markus Triska
2016-07-03 19:20 ` Eli Zaretskii
2016-07-03 20:37 ` Phillip Lord
2016-07-03 3:31 ` Eli Zaretskii
2016-07-03 9:39 ` Phillip Lord
2016-07-03 21:33 ` Stefan Monnier
2016-07-04 20:34 ` Phillip Lord
2016-07-04 21:32 ` Stefan Monnier
2016-07-05 8:43 ` Phillip Lord
2016-07-05 20:32 ` Markus Triska
2016-07-05 22:00 ` Stefan Monnier
2016-07-05 22:17 ` Phillip Lord
2016-07-05 22:09 ` Phillip Lord
2016-07-05 23:03 ` Markus Triska
2016-07-06 16:02 ` Phillip Lord
2016-07-06 17:59 ` Markus Triska
2016-08-12 23:03 ` npostavs
2016-08-13 8:02 ` Markus Triska
2016-07-05 8:46 ` undo refactoring Phillip Lord
2016-07-05 21:50 ` Stefan Monnier [this message]
2016-07-05 22:22 ` Phillip Lord
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