From: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
To: emacs-devel@gnu.org
Subject: Re: SIGCHLD in vfork child context
Date: Mon, 15 May 2017 10:04:03 +0900 [thread overview]
Message-ID: <wlshk77wxo.wl%mituharu@math.s.chiba-u.ac.jp> (raw)
In-Reply-To: <wl4lwp5n4o.wl%mituharu@math.s.chiba-u.ac.jp>
>>>>> On Sat, 13 May 2017 14:41:59 +0900, YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp> said:
> Recently Emacs on Darwin has changed to use vfork rather than fork
> for performance reasons (Bug#26397). The latest Mac port contains a
> similar change, but I received a report telling that this causes
> occasional hangs.
> It seems that calling waitpid from the SIGCHLD handler results in
> ECHILD in the vfork child context, and in this case, Emacs aborts
> and then hangs in such a context for some reason on macOS.
> I made a patch below to avoid calling the SIGCHLD handler on Darwin,
> but I wonder if this can also be meaningful in other platforms.
> WDYT?
The original reporter could come up with a procedure to reproduce:
1. Enter (call-process-region "abc" nil "cat" nil 0) in *scratch*
2. C-x ( C-x C-e C-x ) to define a macro that evaluates that form
3. C-u 2000 C-x e to evaluate the form 2000 times
I could reproduce the hang on macOS, but not on GNU/Linux. Could
other platform users try it to see if the patch for Darwin is also
meaningful there?
YAMAMOTO Mitsuharu
mituharu@math.s.chiba-u.ac.jp
next prev parent reply other threads:[~2017-05-15 1:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-13 5:41 SIGCHLD in vfork child context YAMAMOTO Mitsuharu
2017-05-15 1:04 ` YAMAMOTO Mitsuharu [this message]
2017-05-16 8:58 ` Paul Eggert
2017-05-16 9:19 ` Andreas Schwab
2017-05-16 9:50 ` Paul Eggert
2017-05-16 10:22 ` Andreas Schwab
2017-05-19 7:16 ` Paul Eggert
2017-05-19 3:19 ` YAMAMOTO Mitsuharu
2017-05-19 7:18 ` Paul Eggert
2017-05-20 8:22 ` YAMAMOTO Mitsuharu
2017-05-21 8:49 ` Paul Eggert
2017-05-21 8:53 ` mituharu
2017-05-21 9:01 ` Paul Eggert
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/emacs/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=wlshk77wxo.wl%mituharu@math.s.chiba-u.ac.jp \
--to=mituharu@math.s.chiba-u.ac.jp \
--cc=emacs-devel@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/emacs.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).