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Date: Wed, 11 Dec 2002 16:22:55 +0000
To: Ulrich Drepper <drepper@redhat.com>
Cc: "Hu, Boris" <boris.hu@intel.com>,
       "Linux Kernel ML (E-mail)" <linux-kernel@vger.kernel.org>,
       "NPTL list (E-mail)" <phil-list@redhat.com>
Subject: Re: problem about CLONE_PARENT_SETTID | CLONE_CHILD_CLEARTID ?
Message-ID: <20021211162255.B12861@computer-surgery.co.uk>
References: <957BD1C2BF3CD411B6C500A0C944CA260216C261@pdsmsx32.pd.intel.com> <3DF63A0C.6010708@redhat.com>
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In-Reply-To: <3DF63A0C.6010708@redhat.com>; from drepper@redhat.com on Tue, Dec 10, 2002 at 11:01:32AM -0800
From: Roger Gammans <roger@computer-surgery.co.uk>
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On Tue, Dec 10, 2002 at 11:01:32AM -0800, Ulrich Drepper wrote:
> Hu, Boris wrote:
>=20
> >  I have searched CLONE_PARENT_SETTID in kernel, it seems only to appear=
 in=20
> > some non-architecture files, such as /include/linux/sched.h and several=
 arch
> [snip]
> the kernel.  Nobody cared for Arm so far so there obviously is no kernel
> support.

Unless Russell has changed his mind recently,[1] use of SWP in userspace co=
de=20
isn't supported.
I suppose this is less of a concern if futex's work on ARM though.

But you'll need some userspace synchronisation primitive to do useful work=
=20
with threads.

TTFN
[1]	And I haven't been following linux-arm recently.
--=20
Roger.
Master of Peng Shui.  (Ancient oriental art of Penguin Arranging)
GPG Key FPR: CFF1 F383 F854 4E6A 918D  5CFF A90D E73B 88DE 0B3E

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