From: Ken Brown <kbrown@cornell.edu>
To: Sean Whitton <spwhitton@email.arizona.edu>,
Jim Porter <jporterbugs@gmail.com>, Eli Zaretskii <eliz@gnu.org>
Cc: larsi@gnus.org, 56025@debbugs.gnu.org
Subject: bug#56025: 29.0.50; em-extpipe-test-2 times out on EMBA and Cygwin
Date: Mon, 27 Jun 2022 09:25:23 -0400 [thread overview]
Message-ID: <f88c19cf-a071-6f31-fd05-c4024a572778@cornell.edu> (raw)
In-Reply-To: <8735fr2kq6.fsf@melete.silentflame.com>
Thanks to all of you for working on this while I was gone. Unfortunately, the
problem is still present on Cygwin. In my haste to get away, I neglected to
mention that there is apparently a timing issue in Eshell on Cygwin, so that
even three EOFs do not always suffice to kill the process.
My test case is to run
echo bar | sh -c rev
in Eshell. For reasons I don't understand, EOF almost always has to be sent
more than 3 times times before the "sh" process dies. The maximum I've observed
is 93. Inserting "(sit-for 0.01)" after each EOF eliminates the need for extra
EOFs; this is why I referred to the problem as a timing issue.
I propose the following workaround:
--- a/lisp/eshell/esh-io.el
+++ b/lisp/eshell/esh-io.el
@@ -284,10 +284,16 @@ eshell-close-target
;; end-of-file to the reading process. However, some platforms
;; (e.g. Solaris) actually require sending a *third* EOF. Since
;; sending extra EOFs while the process is running shouldn't break
- ;; anything, we'll just send the maximum we'd ever need. See
- ;; bug#56025 for further details.
- (let ((i 0))
- (while (and (<= (cl-incf i) 3)
+ ;; anything, we'll send up to three on all platforms.
+
+ ;; There's an extra wrinkle on Cygwin where, apparently due to an
+ ;; unknown timing issue, it sometimes takes more than three EOFs
+ ;; to kill the process. (This only happens in Eshell, not in an
+ ;; ordinary Cygwin shell.) We work around this problem by sending
+ ;; up to 1000 EOFs on Cygwin. See bug#56025 for further details.
+ (let ((i 0)
+ (n (if (eq system-type 'cygwin) 1000 3)))
+ (while (and (<= (cl-incf i) n)
(eq (process-status target) 'run))
(process-send-eof target))))
Ken
P.S. Has anyone checked to see if the extpipe tests are now passing on EMBA? If
not, maybe the workaround is needed there too. Alternatively, we could simply
use the workaround on all platforms. I don't see what harm it could do.
next prev parent reply other threads:[~2022-06-27 13:25 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-16 18:30 bug#56025: 29.0.50; em-extpipe-test-2 times out on EMBA and Cygwin Ken Brown
2022-06-16 19:30 ` Sean Whitton
2022-06-16 22:01 ` Ken Brown
2022-06-17 13:39 ` Ken Brown
2022-06-18 0:57 ` Sean Whitton
2022-06-18 2:07 ` Ken Brown
2022-06-18 2:35 ` Ken Brown
2022-06-18 3:50 ` Jim Porter
2022-06-18 17:52 ` Ken Brown
2022-06-18 19:02 ` Jim Porter
2022-06-18 20:51 ` Ken Brown
2022-06-18 22:00 ` Jim Porter
2022-06-18 23:46 ` Sean Whitton
2022-06-19 16:02 ` Ken Brown
2022-06-24 1:18 ` Ken Brown
2022-06-24 4:40 ` Sean Whitton
2022-06-24 6:07 ` Eli Zaretskii
2022-06-24 16:53 ` Jim Porter
2022-06-24 22:23 ` Sean Whitton
2022-06-24 23:03 ` Jim Porter
2022-06-25 5:34 ` Eli Zaretskii
2022-06-25 16:13 ` Jim Porter
2022-06-25 16:53 ` Eli Zaretskii
2022-06-26 16:27 ` Lars Ingebrigtsen
2022-06-26 17:12 ` Sean Whitton
2022-06-26 17:22 ` Jim Porter
2022-06-26 21:11 ` Sean Whitton
2022-06-27 13:25 ` Ken Brown [this message]
2022-06-27 15:51 ` Michael Albinus
2022-06-27 16:22 ` Ken Brown
2022-06-27 19:13 ` bug#56025: [EXT]Re: " Sean Whitton
2022-06-27 21:17 ` Ken Brown
2022-06-27 19:18 ` Jim Porter
2022-06-27 21:19 ` Ken Brown
2022-07-01 3:52 ` Jim Porter
2022-07-01 3:58 ` Jim Porter
2022-07-06 22:33 ` Ken Brown
2022-07-07 4:35 ` Jim Porter
2022-07-07 4:42 ` Jim Porter
2022-07-07 12:42 ` Ken Brown
2022-07-17 2:35 ` bug#56025: [WIP PATCH] " Jim Porter
2022-07-17 6:03 ` Eli Zaretskii
2022-07-17 17:44 ` Jim Porter
2022-07-17 18:26 ` Eli Zaretskii
2022-07-17 18:51 ` Jim Porter
2022-07-18 8:09 ` Michael Albinus
2022-07-19 1:58 ` Jim Porter
2022-07-19 7:59 ` Michael Albinus
2022-07-17 21:59 ` Ken Brown
2022-07-18 5:26 ` Jim Porter
2022-07-22 4:16 ` bug#56025: [PATCH v2] " Jim Porter
2022-07-22 19:00 ` Ken Brown
2022-07-24 4:05 ` Jim Porter
2022-07-24 5:19 ` bug#56025: [PATCH v3] " Jim Porter
2022-07-24 5:29 ` bug#56025: [PATCH v4] " Jim Porter
2022-07-24 9:08 ` Lars Ingebrigtsen
2022-07-24 9:48 ` Eli Zaretskii
2022-07-24 21:04 ` Ken Brown
2022-07-24 9:47 ` Eli Zaretskii
2022-07-24 17:36 ` bug#56025: [PATCH v5] " Jim Porter
2022-07-24 20:30 ` Ken Brown
2022-07-31 1:01 ` Jim Porter
2022-08-06 1:10 ` Jim Porter
2022-08-06 12:17 ` Lars Ingebrigtsen
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