From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Timing Block of GNAT code in milliseconds
Date: Sat, 30 Apr 2005 11:47:54 +0200
Date: 2005-04-30T11:47:49+02:00 [thread overview]
Message-ID: <9483czsw2g3h.1rxbqjt63e13m$.dlg@40tude.net> (raw)
In-Reply-To: qLednUYN74JmCu_fRVn-iA@comcast.com
On Fri, 29 Apr 2005 15:24:27 -0500, tmoran@acm.org wrote:
>> 2. Real_Time.Clock time is valid no longer next system boot.
> Why? You could surely have a single black box located, say, in Greenwich
> England, which could be queried for time over the internet.
So it will be until next black box boot. (:-))
> Then you make
> a body for Real_Time.Clock that does that query to provide a time. All of
> your programs on all of your distributed programs use the same library so
> they query the same box and get the same time. The duration of a call to
> such a Real_Time.Clock might be long and might be variable, but that's
> true to some extent just running on a single multi-tasking machine. If
> you want something faster and less variable, have each machine read from a
> time continually transmitted over a fiber optic cable from a central
> source. There's no requirement that Ada.Real_Time use whatever low
> quality clock is provided by the particular computer it's running on.
> That just happens to be simpler, and adequate for most uses.
There are enough time service departments all over the world to create a
new one (per each application.) Why not to follow international standards?
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2005-04-30 9:47 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-21 13:28 Timing Block of GNAT code in milliseconds markp
2005-04-21 18:00 ` tmoran
2005-04-21 18:53 ` markp
2005-04-21 19:40 ` Marc A. Criley
2005-04-21 19:44 ` Simon Wright
2005-04-22 1:00 ` Steve
2005-04-23 5:39 ` Simon Wright
2005-04-23 17:49 ` Steve
2005-04-24 18:57 ` Simon Wright
2005-04-24 20:05 ` Dmitry A. Kazakov
2005-04-25 22:56 ` Randy Brukardt
2005-04-28 20:26 ` Simon Wright
2005-04-29 8:11 ` Dmitry A. Kazakov
2005-04-29 18:25 ` tmoran
2005-04-29 19:19 ` Dmitry A. Kazakov
2005-04-29 20:24 ` tmoran
2005-04-30 9:47 ` Dmitry A. Kazakov [this message]
2005-04-29 20:52 ` Randy Brukardt
2005-04-30 10:02 ` Dmitry A. Kazakov
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