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From: Jarek Poplawski <jarkao2@o2.pl>
To: davids@webmaster.com
Cc: larry.finger@lwfinger.net, LKML <linux-kernel@vger.kernel.org>
Subject: Re: Question regarding mutex locking
Date: Thu, 29 Nov 2007 08:56:15 +0100	[thread overview]
Message-ID: <20071129075615.GA9962@ff.dom.local> (raw)
In-Reply-To: <MDEHLPKNGKAHNMBLJOLKEEBHIIAC.davids@webmaster.com>

On 29-11-2007 03:34, David Schwartz wrote:
>> Thanks for the help. Someday, I hope to understand this stuff.
>>
>> Larry
> 
> Any code either deals with an object or it doesn't. If it doesn't deal with
> that object, it should not be acquiring locks on that object. If it does
> deal with that object, it must know the internal details of that object,
> including when and whether locks are held, or it cannot deal with that
> object sanely.
...

Maybe it'll unnecessarily complicate the thing, but since you repeat
the need to know the object - sometimes the locking is done to
synchronize something in time only, so to assure only one action is
done at a time or a few actions are done in proper order, or/and
shouldn't be broken in the meantime by other actions (so, no need
to deal with any common data).

But, of course, we can say an action could be a kind of object too.

Regards,
Jarek P.

  reply	other threads:[~2007-11-29  7:51 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <fa.C9TdvYAhY8SablNc39IpD8WDnNM@ifi.uio.no>
2007-11-28  4:53 ` Question regarding mutex locking Robert Hancock
2007-11-28  5:19   ` Larry Finger
2007-11-29  2:34     ` David Schwartz
2007-11-29  7:56       ` Jarek Poplawski [this message]
2007-11-28  4:37 Larry Finger
2007-11-28  8:10 ` Matthias Kaehlcke
2007-11-28 14:46   ` Larry Finger
2007-11-28 15:00     ` Matthias Kaehlcke
2007-11-28 15:22 ` Andreas Schwab
2007-11-28 15:41   ` Larry Finger
2007-11-28 22:45     ` Jarek Poplawski
2007-11-28 22:56       ` Jarek Poplawski
2007-11-28 23:07         ` Jarek Poplawski
2007-11-28 23:33       ` Stephen Hemminger
2007-11-29  6:40         ` Jarek Poplawski
2007-11-30  1:13 ` Bryan O'Sullivan

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