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From: "David Xu" <davidxu@freebsd.org>
To: "Daniel Eischen" <eischen@pcnet1.pcnet.com>,
	"David Xu" <davidxu@viatech.com.cn>
References: <Pine.GSO.4.10.10304271048300.20259-100000@pcnet1.pcnet.com>
Date: Mon, 28 Apr 2003 08:12:24 +0800
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cc: freebsd-threads@freebsd.org
Subject: Re: pthread_join
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In thr_cleanup(),  joinee accesses joiner without holding joiner's sched =
lock,
it is possible when joinee accesses joiner, the joiner may disappear =
(canceled).

if ((joiner->state =3D=3D PS_JOIN) &&
		    (joiner->join_status.thread =3D=3D thread)) {
			joiner->join_status.thread =3D NULL;

David Xu

----- Original Message -----=20
From: "Daniel Eischen" <eischen@pcnet1.pcnet.com>
To: "David Xu" <davidxu@viatech.com.cn>
Cc: <freebsd-threads@freebsd.org>
Sent: Sunday, April 27, 2003 11:02 PM
Subject: Re: pthread_join


> On Sun, 27 Apr 2003, David Xu wrote:
> > I found I can not get the following race fixed:
> > Thread A is a joiner of  thread B, thread C calls pthread_cancel on =
A,
> > because of multipile scheduler locks,  I can not get the race fixed. =

> > Is it possible we just use a single scheduler lock to simplify =
things a bit?
>=20
> Hmm, you mean if thread A is already joined on B?  I don't see the
> race.  Everything looks right.  We don't take multiple scheduling
> locks at the same time, so everything should work.
>=20
> --=20
> Dan Eischen
>=20
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>=20