Subject: bug#64735: 29.0.92; find invocations are ~15x slower because of ignores

From: Eli Zaretskii <[email-masked]>
Date: Sun, 23 Jul 2023 12:39:42 +0300

> From: Ihor Radchenko <[email-masked]>
> Cc: [email-masked], [email-masked], [email-masked],
>  [email-masked], [email-masked], [email-masked]
> Date: Sun, 23 Jul 2023 09:34:20 +0000
> 
> The only callback paradigm I know of in Emacs is something like process
> sentinels. Do you have something else in mind?

Think about an API that is passed a function, and calls that function
when appropriate, to perform caller-defined processing of the stuff
generated by the API's implementation.  That function is what I
referred to as "callback".