From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Andi Kleen <andi@firstfloor.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Ingo Molnar <mingo@redhat.com>,
Arjan van de Ven <arjan@infradead.org>,
Hugh Dickins <hugh@veritas.com>,
Ulrich Drepper <drepper@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH, v3] shmat: introduce flag SHM_MAP_NOT_FIXED
Date: Wed, 8 Oct 2008 11:20:37 +0100 [thread overview]
Message-ID: <20081008112037.6fa37c0b@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <20081008091112.GK7971@one.firstfloor.org>
> That is racy when multi threaded because shmat() doesn't replace, so you
> would need to munmap() inbetween and someone else could steal the area
> then. Yes you could stick a loop around it. It could livelock.
> No, it's not a good interface I would advocate.
You could just use pthread mutexes in your application. The rA'le of the
kernel is not to provide nappies for people who think programming is too
hard but to provide services that can be used to build applications.
Alan
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next prev parent reply other threads:[~2008-10-08 10:20 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-07 16:15 Kirill A. Shutemov
2008-10-07 16:31 ` KOSAKI Motohiro
2008-10-07 21:10 ` Andi Kleen
2008-10-07 21:38 ` KOSAKI Motohiro
2008-10-07 23:23 ` Andi Kleen
2008-10-07 23:05 ` Alan Cox
2008-10-07 23:20 ` Andi Kleen
2008-10-07 23:40 ` Alan Cox
2008-10-07 23:57 ` Andi Kleen
2008-10-08 8:33 ` Alan Cox
2008-10-08 8:34 ` Alan Cox
2008-10-08 8:43 ` Andi Kleen
2008-10-08 8:58 ` Alan Cox
2008-10-08 9:11 ` Andi Kleen
2008-10-08 10:20 ` Alan Cox [this message]
2008-10-08 11:02 ` Andi Kleen
2008-10-08 12:46 ` Alan Cox
2008-10-07 16:54 ` Alan Cox
2008-10-08 8:57 ` Michael Kerrisk
2008-10-08 9:35 ` Kirill A. Shutemov
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