linux-kernel - Re: main thread pthread_exit/sys

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Date:	Mon, 2 Feb 2009 18:39:15 -0800
From:	Kaz Kylheku <kkylheku@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>
Subject: Re: main thread pthread_exit/sys_exit bug!

On Mon, Feb 2, 2009 at 12:39 PM, Kaz Kylheku <kkylheku@...il.com> wrote:
> On Mon, Feb 2, 2009 at 12:17 PM, Ulrich Drepper <drepper@...hat.com> wrote:
>> The userlevel context of the
>> thread is not usable anymore.  It will have run all kinds of
>> destructors.  The current behavior is AFAIK that the main thread won't
>> react to any signal anymore.  That is absolutely required.
>
> Hey Ulrich,
>
> Thanks for articulating that requirement. I think it can be met by
> extending the patch a little bit.

I've now done that.

The exiting thread leader, if there are still other
threads alive, gets its own private signal handler array in which
every action is set to SIG_IGN, using the ignore_signals
function.

I experimented with blocking signals, but that approach
breaks the test case of being able to attach GDB to the
exiting thread.

As part of the patch, I found it convenient to extend the
incomplete sys_unshare functionality w.r.t. signal handlers,
rather than reinvent the wheel.

Cheers ...

http://sourceware.org/bugzilla/attachment.cgi?id=3702
http://sourceware.org/bugzilla/attachment.cgi?id=3705
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