From: "Warren W. Gay VE3WWG" <ve3wwg@cogeco.ca>
Subject: Re: stupid question: how can I finish a program?
Date: Thu, 29 Aug 2002 15:17:51 -0400
Date: 2002-08-29T15:17:51-04:00 [thread overview]
Message-ID: <3D6E735F.2080400@cogeco.ca> (raw)
In-Reply-To: MN6naJHBaAtm@eisner.encompasserve.org
Larry Kilgallen wrote:
> In article <3D6E507E.7010805@cogeco.ca>, "Warren W. Gay VE3WWG" <ve3wwg@cogeco.ca> writes:
>
>
>>Even in "proper O/S" there are occaisions where cleanup is needed,
>>but not automatically done by the O/S. Here are 3 examples of
>>this, that can happen on [pick your] UNIX:
>>
>> - Allocated _SHARED_ memory
>> - Created message queues (IPC)
>> - Create semaphores
>>
>>The reason these are not automatically cleaned up by the O/S is that
>>sometimes you want them to persist beyond the creating process'
>>lifetime (because they are shared by other processes).
>
> VMS tends toward making those go away when the last accessing program
> exists. At least for the first one there is an option to make it really
> permanent, but I don't think I have ever really wanted that.
UNIX does support the idea of a SEM_UNDO operation, where semaphores
are "undone" if the process is blown away. However, even that is
not necessarily the right thing to do (do you want to unlock a botched
shared memory region and hope for the best?)
>>This depends upon the application designer (not the O/S). The temp file
>>is indeed automatically cleaned up by the O/S if the application writer
>>uses the correct calls or does it correctly himself.
>
> On top of all those other requirements, you want correct programming ?
Is there any other kind of Ada programmer? ;-)
--
Warren W. Gay VE3WWG
http://home.cogeco.ca/~ve3wwg
next prev parent reply other threads:[~2002-08-29 19:17 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <c923f575.0208130627.479e0b3d@posting.google.com>
2002-08-13 14:37 ` stupid question: how can I finish a program? chris.danx
2002-08-13 23:53 ` Robert C. Leif
2002-08-14 2:07 ` Wes Groleau
2002-08-14 5:53 ` Robert C. Leif
2002-08-14 13:30 ` Wes Groleau
2002-08-14 13:56 ` Marin D. Condic
2002-08-17 15:58 ` Robert Dewar
2002-08-14 19:18 ` Simon Wright
2002-08-15 14:02 ` Wes Groleau
2002-08-15 1:47 ` Robert Dewar
2002-08-15 5:14 ` Michael Bode
2002-08-17 14:28 ` Alfred Hilscher
2002-08-15 5:17 ` tmoran
2002-08-15 18:41 ` Robert Dewar
2002-08-14 13:53 ` Marin D. Condic
2002-08-15 17:39 ` tmoran
2002-08-16 13:46 ` Marin D. Condic
2002-08-17 14:26 ` Warren W. Gay VE3WWG
2002-08-22 19:16 ` tmoran
2002-08-22 20:54 ` Marin D. Condic
2002-08-25 2:22 ` Robert Dewar
2002-08-26 15:59 ` Marin D. Condic
2002-08-27 21:59 ` Robert A Duff
2002-08-28 20:40 ` Dmitry A.Kazakov
2002-08-28 13:59 ` Robert A Duff
2002-08-28 16:55 ` Darren New
2002-08-28 18:36 ` Larry Kilgallen
2002-08-28 22:22 ` Robert A Duff
2002-08-28 22:30 ` Darren New
2002-08-28 23:16 ` Robert A Duff
2002-08-29 16:49 ` Warren W. Gay VE3WWG
2002-08-29 18:55 ` Larry Kilgallen
2002-08-29 19:17 ` Warren W. Gay VE3WWG [this message]
2002-08-30 8:09 ` Ole-Hjalmar Kristensen
2002-08-31 20:39 ` Warren W. Gay VE3WWG
2002-08-29 16:35 ` Dennis Lee Bieber
2002-08-29 22:48 ` Dmitry A.Kazakov
2002-08-29 15:18 ` Robert A Duff
2002-08-30 4:29 ` Dmitry A.Kazakov
2002-08-29 16:53 ` Warren W. Gay VE3WWG
2002-08-29 19:03 ` Robert C. Leif
2002-08-29 19:25 ` Warren W. Gay VE3WWG
2002-08-29 20:42 ` Larry Kilgallen
2002-08-29 20:22 ` Robert A Duff
2002-08-30 20:59 ` Simon Wright
2002-08-28 14:33 ` Marin D. Condic
2002-08-28 22:15 ` Larry Kilgallen
2002-08-29 15:30 ` Robert A Duff
2002-08-29 22:16 ` Dmitry A.Kazakov
2002-08-29 13:17 ` Marin D. Condic
2002-08-29 19:32 ` Robert A Duff
2002-08-31 2:40 ` Dmitry A.Kazakov
2002-08-31 0:10 ` Toshitaka Kumano
2002-09-02 21:02 ` Dmitry A.Kazakov
2002-08-29 16:59 ` Warren W. Gay VE3WWG
2002-08-29 18:26 ` Marin D. Condic
2002-08-13 14:38 ` David C. Hoos
2002-08-13 20:08 ` Adam Beneschan
2002-08-14 6:41 ` Emil Moholth
2002-08-14 14:00 ` Marin D. Condic
2002-08-14 7:37 ` Martin Dowie
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