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From: Martin Wirth <Martin.Wirth@dlr.de>
To: frankeh@watson.ibm.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Lightweight userspace semphores
Date: Wed, 27 Feb 2002 09:43:45 +0100	[thread overview]
Message-ID: <3C7C9C41.5080400@dlr.de> (raw)

Hi Hubertus,

I just had a quick look on your semaphore code. As far as I can see you 
do no re-check of the userspace semaphore counter while going to sleep 
on your kernel semaphore. But this way you may loose synchronization 
between the kernel semaphore and the user-space semaphore counter if 
more than two processes are involved. Or did I miss some tricky form
of how you avoided this problem?

Martin Wirth


             reply	other threads:[~2002-02-27  8:44 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-02-27  8:43 Martin Wirth [this message]
2002-02-27 15:24 ` [PATCH] Lightweight userspace semphores Hubertus Franke
2002-02-27 17:17   ` Martin Wirth
2002-02-27 19:04     ` Hubertus Franke
     [not found]       ` <3C7FDF76.9040903@dlr.de>
2002-03-02 14:08         ` [PATCH] Lightweight userspace semaphores Hubertus Franke
2002-03-03 22:13           ` [Lse-tech] " Paul Jackson
2002-03-04  6:13             ` Rusty Russell
2002-03-04 16:07             ` Hubertus Franke

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