Message-ID: <4784A74B.3040807@pengutronix.de>
Date: Wed, 09 Jan 2008 11:51:55 +0100
From: Marc Kleine-Budde <mkl@pengutronix.de>
Organization: pengutronix
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To: tom@kavaga.com
CC: linux-kernel@vger.kernel.org
References: <39848.76.189.45.79.1199874932.squirrel@webmail.kavaga.com>
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Subject: Re: Possible 2.6.24-rc7 issue w/respect to pthreads
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tom@kavaga.com wrote:
> To Whom It May Concern,
>=20
> After I patched my 2.6.23 kernel to 2.6.24-rc7 this morning, I noticed
> some odd behavior with respect to POSIX threads in a test program I had=

> written (originally to test epoll.)
>=20
> The behavior is as follows:
>=20
> 1.  main() creates a new thread of execution with pthread_create
> 2.  thread_func() immediately calls pthread_detach(), which is supposed=
 to
> ensure that thread resources are cleaned up when the thread terminates.=

> 3.  The spawned thread sleeps and then prints a message "got here"
> 4.  The main thread calls pthread_join().  According to the POSIX
> documentation, this should suspend execution until the spawned thread h=
as
> terminated.

Quoting the man page of pthread_detach():

After pthread_detach completes, subsequent attempts to perform
pthread_join on th will fail.

regard - Marc
--=20
 Marc Kleine-Budde              Phone: +49-231-2826-924
 Pengutronix - Linux Solutions for Science and Industry
 Vertretung West/Dortmund     http://www.pengutronix.de


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