From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Qiantan Hong <qhong@mit.edu>
Cc: "emacs-devel@gnu.org" <emacs-devel@gnu.org>
Subject: Re: save-excursion and multi-thread?
Date: Mon, 27 Sep 2021 15:35:37 -0400 [thread overview]
Message-ID: <jwvtui5rf7p.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <5713E898-28B8-456C-992C-F0332FACA9FF@mit.edu> (Qiantan Hong's message of "Sun, 26 Sep 2021 17:41:17 +0000")
> Is this how save-excursion supposed to work?
Good question.
> It’s inconsistent with the behavior of special variable + dynamic bindings,
> which works currently under multi-thread.
You might be right and maybe we should undo/redo such buffer movements when
context-switching, just like we do for the let bindings.
We already implement such undo/redo of this and similar forms in
a different yet related context: when we evaluate a user-specified
expression in a given stack frame (from the *Backtrace* debugger).
See `backtrace-eval`.
This said, your scenario smells like a race-condition to me, so maybe we
should instead "lock" the buffer's point while we're inside the
`save-excursion`.
Stefan
prev parent reply other threads:[~2021-09-27 19:35 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-26 17:41 save-excursion and multi-thread? Qiantan Hong
2021-09-26 18:18 ` Eli Zaretskii
2021-09-26 18:28 ` Qiantan Hong
2021-09-26 18:53 ` Eli Zaretskii
2021-09-26 19:09 ` Qiantan Hong
2021-09-26 19:14 ` Eli Zaretskii
2021-09-26 19:13 ` Qiantan Hong
2021-09-26 19:16 ` Eli Zaretskii
2021-09-26 19:21 ` Qiantan Hong
2021-09-26 19:29 ` Eli Zaretskii
2021-09-26 19:42 ` Qiantan Hong
2021-09-26 19:45 ` Qiantan Hong
2021-09-27 4:36 ` Eli Zaretskii
2021-09-28 23:33 ` Richard Stallman
2021-09-29 1:41 ` dick
2021-09-29 2:59 ` Qiantan Hong
2021-10-01 22:32 ` Richard Stallman
2021-09-29 12:45 ` Eli Zaretskii
2021-10-01 22:35 ` Richard Stallman
2021-09-27 4:36 ` Eli Zaretskii
2021-09-27 5:00 ` Qiantan Hong
2021-09-27 5:54 ` Eli Zaretskii
2021-09-27 6:14 ` Qiantan Hong
2021-09-27 10:13 ` Eli Zaretskii
2021-09-26 18:21 ` Tassilo Horn
2021-09-26 19:02 ` Eli Zaretskii
2021-09-27 19:35 ` Stefan Monnier [this message]
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