From: michael.cadilhac@lrde.org (Michaël Cadilhac)
Cc: agustin.martin@hispalinux.es, storm@cua.dk, emacs-devel@gnu.org
Subject: Re: delete-process bug
Date: Mon, 29 May 2006 23:42:39 +0200 [thread overview]
Message-ID: <87irnofqy8.fsf@lrde.org> (raw)
In-Reply-To: <umzd0frsh.fsf@gnu.org> (Eli Zaretskii's message of "Tue, 30 May 2006 00:24:30 +0300")
[-- Attachment #1.1: Type: text/plain, Size: 1590 bytes --]
Eli Zaretskii <eliz@gnu.org> writes:
> If there's a message or two (as opposed to the whole thread) which I
> could read to figure out what are you asking about, please tell what
> that message is, and I will try to answer your questions.
I will summarize the whole thing:
1) A race condition was found:
delete_process is called for a process A, a synchronous process B is
then launched. sigchld_handler is now called for A, but A is not found
in process_alist, so it is considered to be synchronous, and B will be
said to be dead.
2) The chosen solution is the following:
We should remember the list of deleted processes. It's done thanks to
a static variable `deleted_process_list' in process.c.
When the sighandler is called, it will check if the process that
signaled Emacs is in `deleted_process_list'.
3) Now, we want to avoid leaks with this list: we want to know when
both delete_process and sigchld_handler are called.
AFAICT, both functions are just in a #ifdef subprocesses. But, maybe,
in some systems, sigchld_handler is not used albeit compiled.
The question I asked is : do we have to disable the
`deleted_process_alist' mechanism in some configuration to avoid that
it will be filled but never cleaned ?
--
| Michaël `Micha' Cadilhac | Pour les 35-40 ans, l'humour |
| Epita/LRDE Promo 2007 | c'est une plus-value. |
| http://www.lrde.org/~cadilh_m | -- Guillaume L. |
`-- - JID: micha@amessage.be --' - --'
[-- Attachment #1.2: Type: application/pgp-signature, Size: 188 bytes --]
[-- Attachment #2: Type: text/plain, Size: 142 bytes --]
_______________________________________________
Emacs-devel mailing list
Emacs-devel@gnu.org
http://lists.gnu.org/mailman/listinfo/emacs-devel
next prev parent reply other threads:[~2006-05-29 21:42 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-24 19:36 Ispell loads dict twice Michaël Cadilhac
2006-04-26 10:14 ` Agustin Martin
2006-04-26 21:58 ` Michaël Cadilhac
2006-05-23 18:26 ` Michaël Cadilhac
2006-05-24 11:28 ` Agustin Martin
2006-05-25 10:57 ` delete-process bug (was: Ispell loads dict twice.) Michaël Cadilhac
2006-05-25 12:19 ` Agustin Martin
2006-05-25 14:55 ` delete-process bug Stefan Monnier
2006-05-25 14:59 ` David Kastrup
2006-05-25 15:17 ` Michaël Cadilhac
2006-05-25 15:26 ` David Kastrup
2006-05-25 19:40 ` Stefan Monnier
2006-05-25 23:51 ` Kim F. Storm
2006-05-26 4:49 ` Richard Stallman
2006-05-26 13:03 ` Stefan Monnier
2006-05-26 2:22 ` Richard Stallman
2006-05-26 11:29 ` Michaël Cadilhac
2006-05-27 3:36 ` Richard Stallman
2006-05-26 13:10 ` Stefan Monnier
2006-05-26 17:27 ` Michael Mauger
2006-05-27 9:19 ` Michaël Cadilhac
2006-05-27 14:16 ` Stefan Monnier
2006-05-27 14:29 ` Michaël Cadilhac
2006-05-28 16:01 ` Michaël Cadilhac
2006-05-28 18:00 ` Stefan Monnier
2006-05-28 18:32 ` Michaël Cadilhac
2006-05-28 19:48 ` Stefan Monnier
2006-05-28 20:26 ` Michaël Cadilhac
2006-05-28 21:15 ` Kim F. Storm
2006-05-28 21:36 ` Michaël Cadilhac
2006-05-28 23:54 ` Stefan Monnier
2006-05-29 11:39 ` Michaël Cadilhac
2006-05-29 8:22 ` Kim F. Storm
2006-05-29 8:50 ` David Kastrup
2006-05-29 19:04 ` Eli Zaretskii
2006-05-29 19:27 ` Eli Zaretskii
2006-05-29 21:42 ` Kim F. Storm
2006-05-29 22:08 ` Eli Zaretskii
2006-05-29 3:32 ` Eli Zaretskii
2006-05-29 8:14 ` Kim F. Storm
2006-05-29 10:59 ` Michaël Cadilhac
2006-05-29 19:25 ` Eli Zaretskii
2006-05-29 20:04 ` Michaël Cadilhac
2006-05-29 21:24 ` Eli Zaretskii
2006-05-29 21:42 ` Michaël Cadilhac [this message]
2006-05-29 22:11 ` Eli Zaretskii
2006-05-29 22:32 ` Michaël Cadilhac
2006-05-30 12:11 ` Kim F. Storm
2006-05-30 12:42 ` Michaël Cadilhac
2006-05-30 14:26 ` Kim F. Storm
2006-05-30 15:13 ` Michaël Cadilhac
2006-06-01 14:06 ` Kim F. Storm
2006-06-01 14:20 ` Michaël Cadilhac
2006-06-01 14:29 ` Kim F. Storm
2006-06-01 16:05 ` Michaël Cadilhac
2006-06-02 7:46 ` Kim F. Storm
2006-06-01 16:41 ` Agustin Martin
2006-06-01 16:55 ` Michaël Cadilhac
2006-05-29 23:07 ` Agustin Martin
2006-05-25 23:52 ` delete-process bug (was: Ispell loads dict twice.) Kim F. Storm
2006-06-06 20:45 ` Ispell loads dict twice Michaël Cadilhac
2006-06-09 13:02 ` Kim F. Storm
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=87irnofqy8.fsf@lrde.org \
--to=michael.cadilhac@lrde.org \
--cc=agustin.martin@hispalinux.es \
--cc=emacs-devel@gnu.org \
--cc=storm@cua.dk \
/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).