From: Eli Zaretskii <eliz@gnu.org>
To: LdBeth <andpuke@foxmail.com>
Cc: tom@logand.com, emacs-devel@gnu.org
Subject: Re: using finalizers
Date: Fri, 31 Dec 2021 09:50:41 +0200 [thread overview]
Message-ID: <83r19tgqlq.fsf@gnu.org> (raw)
In-Reply-To: <tencent_F418F83A1356647F356E00DD688E9F3D2608@qq.com> (message from LdBeth on Fri, 31 Dec 2021 10:46:20 +0800)
> Date: Fri, 31 Dec 2021 10:46:20 +0800
> From: LdBeth <andpuke@foxmail.com>
> Cc: emacs-devel@gnu.org
>
> > What is the expected example usage of finalizers in Emacs Lisp?
> > How can I verify, that my finalizer works?
>
> (setq bar nil)
> (setq foo (make-finalizer (lambda ()
> (setq bar t))))
>
> (setq foo nil)
> (garbage-collect)
>
> bar ; => t
I think that the assumption that a call to garbage-collect will
necessarily call the finalizer is also problematic: there's usually no
simple way to make sure there are no references left to the object,
and GC could have its own ideas when to actually garbage-collect an
object.
next prev parent reply other threads:[~2021-12-31 7:50 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-30 22:43 using finalizers Tomas Hlavaty
2021-12-31 2:46 ` LdBeth
2021-12-31 3:29 ` Stefan Monnier
2021-12-31 3:36 ` Stefan Monnier
2021-12-31 4:30 ` LdBeth
2021-12-31 4:43 ` LdBeth
2021-12-31 6:28 ` Tomas Hlavaty
2021-12-31 10:59 ` LdBeth
2021-12-31 11:18 ` Tomas Hlavaty
2021-12-31 11:41 ` LdBeth
2021-12-31 12:01 ` Tomas Hlavaty
2022-01-01 17:00 ` Stefan Monnier
2022-01-01 20:25 ` Tomas Hlavaty
2022-01-01 20:47 ` Stefan Monnier
2022-01-01 22:55 ` Tomas Hlavaty
2022-01-01 23:18 ` Stefan Monnier
2022-01-01 23:47 ` Tomas Hlavaty
2022-01-01 23:26 ` Tomas Hlavaty
2021-12-31 7:50 ` Eli Zaretskii [this message]
2021-12-31 9:31 ` Tomas Hlavaty
2021-12-31 12:27 ` Eli Zaretskii
2022-01-01 17:58 ` Tomas Hlavaty
2022-01-01 18:20 ` Eli Zaretskii
2022-01-01 20:55 ` Stefan Monnier
2022-01-01 23:05 ` Tomas Hlavaty
2022-01-01 23:21 ` Stefan Monnier
2021-12-31 14:23 ` Rudolf Schlatte
2021-12-31 16:21 ` Stefan Monnier
2022-01-01 17:37 ` Tomas Hlavaty
2022-01-01 22:36 ` Tomas Hlavaty
2022-01-02 6:54 ` Eli Zaretskii
2022-01-02 7:53 ` Tomas Hlavaty
2022-01-02 8:33 ` Eli Zaretskii
2022-01-02 13:10 ` Tomas Hlavaty
2022-01-02 14:42 ` Eli Zaretskii
2022-01-02 15:16 ` Eli Zaretskii
2022-01-02 17:18 ` Tomas Hlavaty
2022-01-02 18:11 ` Rudolf Schlatte
2022-01-03 0:37 ` Tomas Hlavaty
2022-01-04 3:08 ` Richard Stallman
2021-12-31 14:39 ` LdBeth
2022-01-01 17:59 ` Tomas Hlavaty
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