From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Alexander Shukaev <emacs@Alexander.Shukaev.name>
Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
Subject: Re: Temporarily disable `timer-event-handler'
Date: Tue, 04 Feb 2020 19:53:31 -0500 [thread overview]
Message-ID: <jwvmu9x516i.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <feaf06a0-8eb1-18c0-ed74-dcd8030866d6@Alexander.Shukaev.name> (Alexander Shukaev's message of "Tue, 4 Feb 2020 23:30:45 +0100")
>> But there can also be cases where A does want/need B to be processed
>> before A ends.
>
> Nonetheless, given the availability of dynamic binding, I find this
> error-prone. Is there currently a way in Emacs Lisp to run a function
> within a separate stack,
Yes and no. Until "recently" the answer was clearly no, and now it's
kinda possible but not in a really nice way:
- using threads (which are not always available, so it can only be used conditionally).
- using `backtrace-eval` which will temporarily undo part of the
currently installed dynamic bindings (as well as
`with-current-buffer`s and `save-excursion`s, IIRC) before evaluating
an expression.
> Additionally, I believe the solution to fulfill
>> The expectation is that `B' strictly runs after `A' finishes execution.
> is also missing.
Yup!
> Some sort of macro (aka `ignore-timers') which essentially
> forbids yielding during the execution of the enclosed body,
No, remember: Emacs is a Lisp machine, aka a kind of OS, so this would
mean that application A hogs the whole machine just because it wants to
prevent B from running.
Instead we need something more specific which lets A delay B without
delaying other, unrelated, events.
Stefan
next prev parent reply other threads:[~2020-02-05 0:53 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-02 23:25 Temporarily disable `timer-event-handler' Alexander Shukaev
2020-02-03 1:36 ` Drew Adams
2020-02-03 8:23 ` Michael Albinus
2020-02-03 14:01 ` Stefan Monnier
2020-02-03 15:44 ` Eli Zaretskii
2020-02-04 22:30 ` Alexander Shukaev
2020-02-05 0:53 ` Stefan Monnier [this message]
2020-02-05 1:21 ` Alexander Shukaev
2020-02-05 1:30 ` Stefan Monnier
2020-02-05 14:29 ` Eli Zaretskii
2020-02-05 15:09 ` Michael Albinus
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