linux-kernel - Re: Possible 2.6.24-rc7 issue w/respect to pthreads

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Message-ID: <4784A74B.3040807@pengutronix.de>
Date:	Wed, 09 Jan 2008 11:51:55 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	tom@...aga.com
CC:	linux-kernel@...r.kernel.org
Subject: Re: Possible 2.6.24-rc7 issue w/respect to pthreads

tom@...aga.com wrote:
> To Whom It May Concern,
> 
> 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.)
> 
> The behavior is as follows:
> 
> 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 has
> terminated.

Quoting the man page of pthread_detach():

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

regard - Marc
-- 
 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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