From: Thierry Volpiatto <thierry.volpiatto@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: sleep-for documentation and how to pause reliably
Date: Fri, 15 Feb 2013 21:36:04 +0100 [thread overview]
Message-ID: <87r4khgvrf.fsf@gmail.com> (raw)
In-Reply-To: <83haldu342.fsf@gnu.org> (Eli Zaretskii's message of "Fri, 15 Feb 2013 15:18:53 +0200")
Eli Zaretskii <eliz@gnu.org> writes:
>> From: Thierry Volpiatto <thierry.volpiatto@gmail.com>
>> Date: Fri, 15 Feb 2013 11:19:27 +0100
>>
>> > Am I missing something? If not, apart of fixing the docs, _is_ there
>> > any way to wait reliably when async subprocesses are running and
>> > producing output?
>> What about using a sentinel?
>>
>> (progn
>> (let ((proc (start-process-shell-command "ls" nil "ls")))
>> (set-process-sentinel proc #'(lambda (process event)
>> (when (string= event "finished\n"))
>> (sleep-for 20)
>> (message "hi after 20s sleeping"))))
>> (message "Hi now sleeping 20s"))
>
> Thanks, but that's not what I meant. I meant, suppose you must
> reliably wait in a Lisp program that doesn't launch any subprocesses,
> but should always wait for N seconds even if there are some async
> subprocesses running in parallel. IOW, the code that must pause
> doesn't itself launch any subprocesses, it just needs to wait.
Ok.
I tried to run the initial example you sent:
(progn
(setq proc (start-process-shell-command "ls" nil "ls"))
(sleep-for 20)
(message "hi"))
and I noticed that the first time I eval the code Emacs wait for 20s as
expected and on next evaluations it send the message "Hi" immediately
unless I run `list-processes', wait some seconds and reeval it.
--
Thierry
Get my Gnupg key:
gpg --keyserver pgp.mit.edu --recv-keys 59F29997
next prev parent reply other threads:[~2013-02-15 20:36 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-15 9:22 sleep-for documentation and how to pause reliably Eli Zaretskii
2013-02-15 10:19 ` Thierry Volpiatto
2013-02-15 13:18 ` Eli Zaretskii
2013-02-15 20:36 ` Thierry Volpiatto [this message]
2013-02-16 8:40 ` Eli Zaretskii
2013-02-17 11:58 ` Xue Fuqiao
2013-02-17 16:26 ` Eli Zaretskii
2013-02-17 23:41 ` Xue Fuqiao
2013-02-15 16:11 ` Stefan Monnier
2013-02-15 18:24 ` Eli Zaretskii
2013-02-15 20:36 ` Stefan Monnier
2013-03-02 20:48 ` Johan Bockgård
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