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

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Message-ID: <20080109105304.GI15450@devserv.devel.redhat.com>
Date:	Wed, 9 Jan 2008 05:53:04 -0500
From:	Jakub Jelinek <jakub@...hat.com>
To:	tom@...aga.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Possible 2.6.24-rc7 issue w/respect to pthreads

On Wed, Jan 09, 2008 at 02:35:32AM -0800, tom@...aga.com wrote:
> 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.

Your testcase is buggy.  Detached threads aren't joinable, you can't call
pthread_join on them.

	Jakub
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