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From: Pascal Obry
Newsgroups: comp.lang.ada
Subject: Re: Clock drift in gnat 3.13p on Windows
Date: 26 Jan 2001 23:24:40 +0100
Organization: Home - http://perso.wanadoo.fr/pascal.obry
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Date: 2001-01-26T22:27:10+00:00
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cts@kampong.aedinc.net ((null)) writes:
> I have an Ada application compiled with gnat 3.13p. It runs on NT
> or Windows 2000 PC that gets periodic clock updates via NTP.
>
> When the program first starts up Ada.Calendar.Clock, Ada.Real_Time.Clock
> and Win32.Winbase.GetLocalTime all agree on the time. After the
> program has run for a few hours and the PC has gotten a few NTP
> time updates, GNAT's idea of the current time is off by a second
> or two.
Well GNAT is using the High Performance Counter under NT to achieve high
resolution but this counter is certainly not updated by NTP updates...
> I'd like to periodically update the GNAT runtime system's idea of
> the current time. Would it be sufficient to periodically adjust
> the value of Base_Clock and Base_Ticks in System.OS_Primitives?
Well, looking at the implementation it should work :)
But you'll have to break the encapsulation of Base_Clock...
Pascal.
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