From: Robert Dewar <robert_dewar@my-deja.com>
Subject: Re: Ada Protected Object Turorial #2: Overview of Tasks
Date: 1999/12/21
Date: 1999-12-21T00:00:00+00:00 [thread overview]
Message-ID: <83n9ml$89o$1@nnrp1.deja.com> (raw)
In-Reply-To: 385E9343.1D23B0C5@averstar.com
In article <385E9343.1D23B0C5@averstar.com>,
Tucker Taft <stt@averstar.com> wrote:
> Note that most "production quality" database systems operate
> under the presumption that the power cord can be unplugged
> at any moment. Abort is somewhat less catastrophic than
> that...
Or they run on machines with multiple power cords and multiple
disks, where no one can unplug anything successfully :-)
Clearly if you have a full commit rollback system, then you
can indeed rollback on an abort, but still I find the legitimate
uses of ATC very few. Almost always it is better to have a high
priority task preempt to perform the time critical stuff, and
then cleanly abort the lower priority stuff by polling.
Sent via Deja.com http://www.deja.com/
Before you buy.
next prev parent reply other threads:[~1999-12-21 0:00 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-12-18 0:00 Ada Protected Object Turorial #2: Overview of Tasks James S. Rogers
1999-12-19 0:00 ` Robert Dewar
1999-12-20 0:00 ` Tucker Taft
1999-12-21 0:00 ` Robert Dewar [this message]
1999-12-21 0:00 ` Robert I. Eachus
1999-12-22 0:00 ` Robert A Duff
1999-12-23 0:00 ` Robert Dewar
1999-12-23 0:00 ` Robert A Duff
1999-12-23 0:00 ` Robert Dewar
1999-12-27 0:00 ` Robert A Duff
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