From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: Michael Albinus <michael.albinus@gmx.de>
Cc: Paul Eggert <eggert@cs.ucla.edu>, emacs-devel@gnu.org
Subject: Re: some accept-process-output races fixed; Tramp FIXMEs
Date: Tue, 22 Jan 2019 17:06:40 -0500 [thread overview]
Message-ID: <jwv5zug8i46.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <875zujlkhv.fsf@gmx.de> (Michael Albinus's message of "Sun, 20 Jan 2019 10:57:16 +0100")
> IIRC, the timeout is used because accept-process-output could be blocked
> otherwise. Tramp has often the need to check whether there is still
> output from the process, and the timeout is the only way I know that
> accept-process-output returns in finite time.
The time out makes sense when you have *other* things to do (so you're
just polling, making sure those other things don't prevent Emacs from
processing the process/connection's output in a timely fashion).
> If we could guarantee that (accept-process-output p) returns when
> either output has arrived and or the process has finished, I could
> change the code.
This has been the promise of the docstring "for ever", AFAIK.
Which means that if you have nothing else to do until the process dies,
then you're better off using nil for the timeout.
I don't know if that promise was broken by bugs in the code, OTOH.
Stefan
next prev parent reply other threads:[~2019-01-22 22:06 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-15 18:33 some accept-process-output races fixed; Tramp FIXMEs Paul Eggert
2019-01-16 8:32 ` Michael Albinus
2019-01-16 8:38 ` Paul Eggert
2019-01-16 8:49 ` Michael Albinus
2019-01-16 13:03 ` Michael Albinus
2019-01-16 13:25 ` Stefan Monnier
2019-01-16 18:39 ` Paul Eggert
2019-01-16 19:07 ` Stefan Monnier
2019-01-17 0:15 ` Paul Eggert
2019-01-20 9:57 ` Michael Albinus
2019-01-21 23:02 ` Daniel Colascione
2019-01-22 16:54 ` Eli Zaretskii
2019-01-22 7:09 ` Paul Eggert
2019-01-22 16:56 ` Eli Zaretskii
2019-01-22 18:58 ` Michael Albinus
2019-01-22 22:06 ` Stefan Monnier [this message]
2019-01-22 22:45 ` Michael Albinus
2019-01-23 16:18 ` Eli Zaretskii
2019-01-23 18:35 ` Michael Albinus
2019-01-23 22:19 ` Daniel Pittman
2019-01-23 16:47 ` Stefan Monnier
2019-01-23 17:36 ` Paul Eggert
2019-01-28 15:37 ` Michael Albinus
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