X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:date:from:to:subject:message-id:reply-to
	:references:mime-version:content-type:in-reply-to; q=dns; s=
	default; b=qx4P6vdT0XQMesqP2RpJvlg2Vt0qxyXTP7Xgsdk5v2V+dNV2fn141
	zoq8BAhR3Wda0UXJ+r8vk6ddcxqKUVBVEV4RXK/Q37Vzmbn/sSLgQUedSbhYqcoZ
	rR0CSvfl6laduSYOnjGc2RTgieImjsDUH21apmtZ3nEH7vPU2xJnEA=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:date:from:to:subject:message-id:reply-to
	:references:mime-version:content-type:in-reply-to; s=default;
	bh=+/+jH9AjuE5WU2HIxn/HAxqlf80=; b=iFQaIu3xbW+qmKw/agnb2rDyi0J4
	55k7I9jkoOOqPtQX6v9ZzSsx5CF80FMCWvFV7pHNYxbhsZZ3cGSwuqlkZb/HwpRw
	HX63WG4cuXC6AiDYsXj2JHUzTZGyxPx5VeoNnxXXR7qFhJSr+ghplvTqJ3E4ZSZA
	xgN4yYcXdpnFhGE=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
Authentication-Results:	sourceware.org; auth=none
X-Virus-Found:	No
X-Spam-SWARE-Status:	No, score=-5.9 required=5.0 tests=AWL,BAYES_00 autolearn=ham version=3.3.2
X-HELO:	calimero.vinschen.de
Date:	Mon, 20 Oct 2014 21:03:50 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Threads
Message-ID:	<20141020190350.GB32374@calimero.vinschen.de>
Reply-To:	cygwin AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
References:	<54450835 DOT 3050602 AT cornell DOT edu> <20141020164324 DOT GA32374 AT calimero DOT vinschen DOT de>
MIME-Version:	1.0
In-Reply-To:	<20141020164324.GA32374@calimero.vinschen.de>
User-Agent:	Mutt/1.5.23 (2014-03-12)

--hHWLQfXTYDoKhP50
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Oct 20 18:43, Corinna Vinschen wrote:
> On Oct 20 09:03, Ken Brown wrote:
> > When trying to debug emacs in gdb, I see several threads, but it's not
> > always clear who created those threads and what they're doing.  As an
> > example, I attached gdb to an emacs-X11 process (running under X) short=
ly
> > after starting it, and I obtained the backtrace appended at the end of =
this
> > message.
> >=20
> > I assume Thread 12 was created by gdb.
> [...]
> > I don't
> > have any idea where the other threads came from.  Presumably at least o=
ne of
> > them was created by Glib.
> >=20
> > The situation is similar with emacs-w32 and emacs-nox, but with fewer t=
hreads.
> >=20
> > In general, is there a way I can understand where all the threads come =
from?
>=20
> There's no simple generic way to do that, afaik.
>=20
> One big problem is to have all the symbols.  You should definitely
> install the debuginfo packages of all potentially affected packages, not
> only cygwin-debuginfo.  If you want to find out where threads are called
> from the application, you might get a clue by running emacs under GDB and
> set a breakpoint to pthread_create.

Btw., I don't know if that helps, but the function names of native
Windows functions given in the GDB backtrace may be off because GDB
doesn't have access to the Windows DLL symbol tables.  If you want to
analyze the stacks from that side, you should install WinDbg(*) and the
symbol files for your OS(**).  If you start the process from WinDbg, you
can better see the Windows functions called from these threads, while
not getting any info about the functions from inside the application
or the Cygwin DLLs.


HTH,
Corinna


(*)  http://msdn.microsoft.com/en-us/windows/hardware/hh852365.aspx
(**) http://msdn.microsoft.com/en-us/windows/hardware/gg463028.aspx

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

--hHWLQfXTYDoKhP50
Content-Type: application/pgp-signature

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
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=9ljn
-----END PGP SIGNATURE-----

--hHWLQfXTYDoKhP50--

- Raw text -