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X-WM-Posted-At: avacado.atomice.net; Thu, 9 May 02 00:23:50 +0100
Message-ID: <018001c1f6e7$6924c420$0100a8c0@advent02>
From: "Chris January" <chris AT atomice DOT net>
To: <cygwin AT cygwin DOT com>
References: <15547 DOT 16136 DOT 163472 DOT 840007 AT bea DOT com><20020415214133 DOT GA19612 AT redhat DOT com> <15577 DOT 12319 DOT 622365 DOT 566799 AT bea DOT com>
Subject: Re: [PATCH] gettimeofday time travels
Date: Thu, 9 May 2002 00:23:50 +0100
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>  > >How about the attached quick and dirty fix?
>  >
>  > I'm sorry but I don't think a quick and dirty fix is justified if
>  > there are other alternatives. I haven't seen any other alternatives
>  > discussed yet.
>
> No other alternatives have been proposed. I'm aware of a couple of
> other XEmacs'ers who are plagued by this (we love our uptime).
>
> I don't believe my patch to be dirtier than the implementation (no
> offence intended!). Please reconsider it.
On Windows  NT, you can use the ZwQuerySystemInformation internal call with
the SystemTimeOfDayInformation structure to get the current time of day at a
greater resolution than you can with the Performance counters. I'm not sure
about the granularity though - that's something that would have to be
tested. However the value doesn't suffer from time-travelling problems. If
indeed the granularity is too coarse, you could still use the value to check
that the QueryPerformanceCounters value is sane (which is what I believe
this discussion was originally about).

Regards
Chris



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