linux-kernel - Re: while_each_thread() under rcu_read

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Message-ID: <4C23A90A.9040303@genband.com>
Date:	Thu, 24 Jun 2010 12:50:50 -0600
From:	Chris Friesen <chris.friesen@...band.com>
To:	paulmck@...ux.vnet.ibm.com
CC:	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Don Zickus <dzickus@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Jerome Marchand <jmarchan@...hat.com>,
	Mandeep Singh Baines <msb@...gle.com>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: while_each_thread() under rcu_read_lock() is broken?

On 06/24/2010 12:07 PM, Paul E. McKenney wrote:

> 3.	The thread-group leader might do pthread_exit(), removing itself
> 	from the thread group -- and might do so while the hapless reader
> 	is referencing that thread.
> 
> 	But isn't this prohibited?  Or is it really legal to do a
> 	pthread_create() to create a new thread and then have the
> 	parent thread call pthread_exit()?  Not something I would
> 	consider trying in my own code!  Well, I might, just to
> 	be perverse, but...  ;-)

I believe SUS allows the main thread to explicitly call pthread_exit(),
leaving the other threads to run.  If the main() routine just returns
then it implicitly calls exit().

Chris

-- 
Chris Friesen
Software Developer
GENBAND
chris.friesen@...band.com
www.genband.com
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