From: Eli Zaretskii <eliz@gnu.org>
To: Philipp Stephani <p.stephani2@gmail.com>
Cc: 33839@debbugs.gnu.org
Subject: bug#33839: 26.1.90; Emacs occasionally fails to receive asynchronous subprocess output in batch mode
Date: Sun, 23 Dec 2018 18:54:15 +0200 [thread overview]
Message-ID: <83o99c89qg.fsf@gnu.org> (raw)
In-Reply-To: <CAArVCkSjNY1KP=oxsUXUF81i+G6ZmouHt3UpYbLCX6OVX6oG8Q@mail.gmail.com> (message from Philipp Stephani on Sun, 23 Dec 2018 17:45:31 +0100)
> From: Philipp Stephani <p.stephani2@gmail.com>
> Date: Sun, 23 Dec 2018 17:45:31 +0100
> Cc: 33839@debbugs.gnu.org
>
> Am So., 23. Dez. 2018 um 16:22 Uhr schrieb Eli Zaretskii <eliz@gnu.org>:
> >
> > > From: Philipp <p.stephani2@gmail.com>
> > > Date: Sun, 23 Dec 2018 03:28:53 +0100
> > >
> > > (with-temp-buffer
> > > (let ((proc (make-process :name "test"
> > > :command '("bash" "-c" "echo stdout; echo stderr >&2")
> > > :buffer (current-buffer)
> > > :connection-type 'pipe
> > > :sentinel #'ignore
> > > :noquery t
> > > :coding '(utf-8-unix . utf-8-unix))))
> > > (when (process-live-p proc)
> > > (process-send-eof proc))
> > > (while (process-live-p proc)
> > > (accept-process-output proc))
> > > (cl-assert (equal (buffer-string) "stdout\nstderr\n") :show-args)))
> > >
> > > Then evaluate this form repeatedly. Occasionally the buffer is empty
> > > and the assertion triggers.
> >
> > Isn't there an inherent race condition here?
>
> Maybe? If so, then it should be documented, with an explanation how to
> write this in a race-free manner.
Can you tell why you used the process-live-p condition for calling
accept-process-output? What happens if you do that unconditionally?
next prev parent reply other threads:[~2018-12-23 16:54 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-23 2:28 bug#33839: 26.1.90; Emacs occasionally fails to receive asynchronous subprocess output in batch mode Philipp
2018-12-23 15:21 ` Eli Zaretskii
2018-12-23 16:45 ` Philipp Stephani
2018-12-23 16:54 ` Eli Zaretskii [this message]
2018-12-25 16:41 ` Philipp Stephani
2018-12-25 17:28 ` Eli Zaretskii
2018-12-25 16:38 ` Philipp Stephani
2018-12-27 21:06 ` Paul Eggert
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