From: Richard Henderson <rth@twiddle.net>
To: Davide Libenzi <davidel@xmailserver.org>
Cc: Hubertus Franke <frankeh@watson.ibm.com>,
Robert Love <rml@tech9.net>,
Rusty Russell <rusty@rustcorp.com.au>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Fast Userspace Mutexes III.
Date: Wed, 6 Mar 2002 17:58:46 -0800 [thread overview]
Message-ID: <20020306175846.B26064@twiddle.net> (raw)
In-Reply-To: <20020304154848.A1055@elinux01.watson.ibm.com> <Pine.LNX.4.44.0203041305250.1561-100000@blue1.dev.mcafeelabs.com>
In-Reply-To: <Pine.LNX.4.44.0203041305250.1561-100000@blue1.dev.mcafeelabs.com>; from davidel@xmailserver.org on Mon, Mar 04, 2002 at 02:15:58PM -0800
On Mon, Mar 04, 2002 at 02:15:58PM -0800, Davide Libenzi wrote:
> That's great. What if the process holding the mutex dies while there're
> sleeping tasks waiting for it ?
The lock is lost. The same thing would happen with locks completely
implemented in userspace.
I don't see that the kernel should do anything about this. If a
thread is killed with predudice (i.e. without pthread_cancel) then
there are all sorts of cleanups that won't happen. Having the
kernel automatically unlock the locks doesn't help much, since
the data structures are quite likely in an inconsistent state.
r~
next prev parent reply other threads:[~2002-03-07 1:59 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
2002-03-07 1:58 ` Richard Henderson [this message]
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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