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Date:      Tue, 14 Sep 2010 23:17:28 -0400
From:      Alexander Kabaev <kabaev@gmail.com>
To:        David Xu <davidxu@FreeBSD.org>
Cc:        svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org
Subject:   Re: svn commit: r212630 - in head/lib/libthr: . thread
Message-ID:  <20100914231728.33ca7466@kan.dnsalias.net>
In-Reply-To: <201009150256.o8F2uXwX004579@svn.freebsd.org>
References:  <201009150256.o8F2uXwX004579@svn.freebsd.org>

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On Wed, 15 Sep 2010 02:56:33 +0000 (UTC)
David Xu <davidxu@FreeBSD.org> wrote:

> Author: davidxu
> Date: Wed Sep 15 02:56:32 2010
> New Revision: 212630
> URL: http://svn.freebsd.org/changeset/base/212630
>=20
> Log:
>   add code to support stack unwinding when thread exits. note that
> only defer-mode cancellation works, asynchrnous mode does not work
> because it lacks of libuwind's support. stack unwinding is not
> enabled unless LIBTHR_UNWIND_STACK is defined in Makefile.
>=20
> Modified:
>   head/lib/libthr/Makefile
>   head/lib/libthr/thread/thr_clean.c
>   head/lib/libthr/thread/thr_create.c
>   head/lib/libthr/thread/thr_exit.c
>   head/lib/libthr/thread/thr_init.c
>   head/lib/libthr/thread/thr_private.h
>=20
> Modified: head/lib/libthr/Makefile
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D
> --- head/lib/libthr/Makefile	Wed Sep 15 01:21:30 2010
> (r212629) +++ head/lib/libthr/Makefile	Wed Sep 15 02:56:32
> 2010	(r212630) @@ -25,6 +25,14 @@
> CFLAGS+=3D-I${.CURDIR}/../../libexec/rtld-
> CFLAGS+=3D-I${.CURDIR}/../../libexec/rtld-elf/${MACHINE_CPUARCH}
> CFLAGS+=3D-I${.CURDIR}/../libthread_db CFLAGS+=3D-Winline
> +
> +LIBTHR_UNWIND_STACK=3Dyes
> +
> +.ifdef LIBTHR_UNWIND_STACK
> +CFLAGS+=3D-I${.CURDIR}/../../contrib/gcc -fexceptions=20
> +CFLAGS+=3D-D_PTHREAD_FORCED_UNWIND
> +.endif
> +
>

Reaching into bowels of GCC like that is never good.
--=20
Alexander Kabaev

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