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Article #11221

Re: Finegrain Sleep

#11221
From: Graham Reeds
Date: Fri, 20 Feb 2004 10:12
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"Steve Aletto" <steve_alettoANTI@SPAMhotmail.com> wrote in message
news:4035bee9@newsgroups.borland.com...
> > GetTickCount() has a resolution of 10 or 15ms depending on
> windows version.
> > I this the poster needs something in the microsecond
> range.
> >
> > GetSystemTimeAsFileTime() has a resolution of
> 100-nanoseconds
>
> Good remark, but I think the call to the function itself
> introduces a delay longer than the pause you wish. That's
> why I think also GetSystemTimeAsFileTime() can't give a
> _precision_ of 100ns although the _resolution_ is 100ns. And
> I'm quite sure a call to GetSystemTimeAsFileTime() requires
> a longer time then a call to GetTickCount().

I'm currently trying out QueryPerformanceCounter() and having a state
machine to quickly switch between the states depending on the time.  Seems
to be working, and doesn't use 3 threads (the GUI, data-in, data-out).

Thanks for the suggestions, but why does GetSystemTimeAsFileTime() give
100ns intervals.  We use UTC here and I am pretty sure that UTC is
1microsecond - or is that 100ns?  It's too early in the morning and I
haven't had enough sleep:-(

--

Graham Reeds,
grahamr@omnieng.co.uk | http://omnieng.co.uk
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From: "Graham Reeds" <grahamr@omnieng.co.uk>
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Subject: Re: Finegrain Sleep
Date: Fri, 20 Feb 2004 10:12:35 -0000
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