From: Roland McGrath <roland@redhat.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Ingo Molnar <mingo@elte.hu>, Petr Vandrovec <vandrove@vc.cvut.cz>,
Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@zip.com.au>
Subject: Re: [patch] Re: Problem with exiting threads under NPTL
Date: Mon, 15 Dec 2003 15:04:48 -0800 [thread overview]
Message-ID: <200312152304.hBFN4mxq024943@magilla.sf.frob.com> (raw)
In-Reply-To: Linus Torvalds's message of Sunday, 14 December 2003 14:32:55 -0800 <Pine.LNX.4.58.0312141420070.1481@home.osdl.org>
> On Sun, 14 Dec 2003, Ingo Molnar wrote:
> >
> > are you sure this can happen? eligible_child() does this:
>
> Interesting. That code should have been enough, but we've later on added
> extra code into wait_task_zombie to check _exactly_ the same case because
> we saw problems.
>
> Hmm.. Maybe that was to protect against concurrent wait4()'ers (which can
> happen - the wait case only takes the read lock). Threads can wait for
> each others children, after all.
My recollection about the wait_task_* changes was that they were mostly to
address races between concurrent wait4 calls.
next prev parent reply other threads:[~2003-12-15 23:04 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-14 5:25 Petr Vandrovec
2003-12-14 15:02 ` Martin Schlemmer
2003-12-14 19:38 ` [patch] " Ingo Molnar
2003-12-14 20:38 ` Linus Torvalds
2003-12-14 20:45 ` Linus Torvalds
2003-12-14 21:02 ` Ingo Molnar
2003-12-15 15:04 ` Jörn Engel
2003-12-14 21:06 ` Ingo Molnar
2003-12-14 22:10 ` Linus Torvalds
2003-12-14 22:17 ` Ingo Molnar
2003-12-14 22:32 ` Linus Torvalds
2003-12-15 23:04 ` Roland McGrath [this message]
2003-12-14 22:28 ` Ingo Molnar
2003-12-14 22:45 ` Linus Torvalds
2003-12-14 23:08 ` Ingo Molnar
2003-12-15 6:31 ` dan carpenter
2003-12-15 11:43 ` Ingo Molnar
2003-12-15 13:07 ` dan carpenter
2003-12-15 15:11 ` Linus Torvalds
2003-12-15 23:15 ` Roland McGrath
2003-12-15 8:54 ` Arjan van de Ven
2003-12-15 22:55 ` Roland McGrath
2003-12-15 23:06 ` Roland McGrath
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