From: "Stephen C. Tweedie" <sct@redhat.com>
To: James Simmons <jsimmons@edgeglobal.com>
Cc: "Stephen C. Tweedie" <sct@redhat.com>, Linux MM <linux-mm@kvack.org>
Subject: Re: MMIO regions
Date: Mon, 4 Oct 1999 17:11:07 +0100 (BST) [thread overview]
Message-ID: <14328.53659.36975.874284@dukat.scot.redhat.com> (raw)
In-Reply-To: <Pine.LNX.4.10.9910041146560.8080-100000@imperial.edgeglobal.com>
Hi,
On Mon, 4 Oct 1999 11:52:50 -0400 (EDT), James Simmons
<jsimmons@edgeglobal.com> said:
>> The kernel doesn't impose any limits against this. If you want to make
>> this impossible, then you need to add locking to the driver itself to
>> prevent multiple processes from conflicting.
> And if the process holding the locks dies then no other process can access
> this resource. Also if the program forgets to release the lock you end up
> with other process never being able to access this piece of hardware.
There are any number of ways to recover from this. SysV semaphores, for
example, allow you to specify UNDO when you down a semaphore, and the
semaphore will be restored automatically on process death.
--Stephen
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next prev parent reply other threads:[~1999-10-04 16:11 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-10-04 14:38 James Simmons
1999-10-04 15:31 ` Stephen C. Tweedie
1999-10-04 15:52 ` James Simmons
1999-10-04 16:02 ` Benjamin C.R. LaHaise
1999-10-04 17:27 ` James Simmons
1999-10-04 17:56 ` Benjamin C.R. LaHaise
1999-10-04 18:26 ` James Simmons
1999-10-04 19:19 ` Stephen C. Tweedie
1999-10-06 20:15 ` James Simmons
1999-10-11 17:09 ` Stephen C. Tweedie
1999-10-11 17:26 ` Jeff Garzik
1999-10-11 23:14 ` James Simmons
1999-10-11 17:57 ` James Simmons
1999-10-04 16:11 ` Stephen C. Tweedie [this message]
1999-10-04 18:29 ` James Simmons
1999-10-04 19:35 ` Stephen C. Tweedie
1999-10-07 19:40 ` James Simmons
1999-10-10 11:24 ` Rik Faith
1999-10-10 14:03 ` Eric W. Biederman
1999-10-10 18:46 ` Rik Faith
1999-10-11 0:21 ` James Simmons
1999-10-11 10:59 ` Rik Faith
1999-10-11 3:38 ` Eric W. Biederman
1999-10-10 14:21 ` James Simmons
1999-10-11 17:22 ` Stephen C. Tweedie
1999-10-04 16:58 ` Marcus Sundberg
1999-10-04 18:27 ` James Simmons
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