mailing list of musl libc
 help / color / mirror / code / Atom feed
From: Rich Felker <dalias@libc.org>
To: musl@lists.openwall.com
Subject: Possible bug: MINSIGSTKSZ values
Date: Fri, 14 Nov 2014 22:18:43 -0500	[thread overview]
Message-ID: <20141115031843.GA3679@brightrain.aerifal.cx> (raw)

Currently musl has MINSIGSTKSZ hard-coded as 2048. This is
insufficient to store the ucontext_t for many archs. I'd like to keep
it small on archs where that's possible, but the current value might
not even work for modern x86 with large AVX state, etc. that needs to
be saved. I don't have a proposed fix yet, but I think we should
survey the values that are needed for different archs and either make
it vary per-arch, or if they're all comparable, just increase the
value to something that works for all archs.

Note that the min pthread stack size is also well below the size of
ucontext_t for many archs, but I don't think this is a problem. If you
make a thread with a stack smaller than MINSIGSTKSZ+epsilon, you just
need to start it with all signals blocked and leave them blocked (or
avoid using signal handlers at all).

Rich


             reply	other threads:[~2014-11-15  3:18 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-15  3:18 Rich Felker [this message]
2014-11-15 20:56 ` Rich Felker
2014-11-17  1:18 ` 黄建忠
2014-11-17  1:26   ` Ivan Kanakarakis
2014-11-17  1:49     ` 黄建忠
2014-11-17  3:20   ` Rich Felker

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

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20141115031843.GA3679@brightrain.aerifal.cx \
    --to=dalias@libc.org \
    --cc=musl@lists.openwall.com \
    /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.vuxu.org/mirror/musl/

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 NNTP newsgroup(s).