From: Edgar Toernig <froese@gmx.de>
To: Robert Love <rml@tech9.net>
Cc: Davide Libenzi <davidel@xmailserver.org>,
Hubertus Franke <frankeh@watson.ibm.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Fast Userspace Mutexes III.
Date: Tue, 05 Mar 2002 05:30:54 +0100 [thread overview]
Message-ID: <3C8449FE.830F881F@gmx.de> (raw)
In-Reply-To: <Pine.LNX.4.44.0203041305250.1561-100000@blue1.dev.mcafeelabs.com> <1015293007.882.87.camel@phantasy>
Robert Love wrote:
>
> On Mon, 2002-03-04 at 17:15, Davide Libenzi wrote:
>
> > That's great. What if the process holding the mutex dies while there're
> > sleeping tasks waiting for it ?
>
> I can't find an answer in the code (meaning the lock is lost...) and no
> one has yet answered. Davide, have you noticed anything?
>
> I think this needs a proper solution..
You can't do very much. The futex holder has probably damaged some
data. The only thing you could do is to kill all current and future
waiters too. But the "future waiters" is difficult. The process
may hold other locks the kernel does not know anything about.
The only thing one could do is to kill all processes that share a
MAP_SEM page with a dying process.
Ciao, ET.
next prev parent reply other threads:[~2002-03-05 4:34 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-04 3:55 [PATCH] Fast Userspace Mutexes III Rusty Russell
2002-03-04 19:49 ` Robert Love
2002-03-04 20:13 ` Davide Libenzi
2002-03-04 20:20 ` Matthew Kirkwood
2002-03-04 20:48 ` Hubertus Franke
2002-03-04 22:15 ` Davide Libenzi
2002-03-05 1:50 ` Robert Love
2002-03-05 2:53 ` Davide Libenzi
2002-03-05 3:45 ` Rusty Russell
2002-03-05 3:55 ` Davide Libenzi
2002-03-05 6:11 ` Rusty Russell
2002-03-05 17:23 ` Davide Libenzi
2002-03-05 15:09 ` Hubertus Franke
2002-03-05 4:30 ` Edgar Toernig [this message]
2002-03-07 1:58 ` Richard Henderson
2002-03-07 2:10 ` Davide Libenzi
2002-03-05 4:48 ` Rusty Russell
2002-03-05 15:15 ` Hubertus Franke
2002-03-06 1:31 ` Rusty Russell
2002-03-05 1:34 ` Rusty Russell
2002-03-07 1:52 ` Richard Henderson
2002-03-07 3:39 ` Rusty Russell
2002-03-07 8:48 ` Richard Henderson
2002-03-07 9:17 ` Rusty Russell
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