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From: Simon Wright <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: real_time.clock is not monotonic
Date: Thu, 22 Feb 2007 10:34:37 +0000
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Date: 2007-02-22T10:34:37+00:00
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Duncan Sands <baldrick@free.fr> writes:

>>         ("rdtsc" & ASCII.LF & ASCII.HT &
>
> I think the user needs to have appropriate permissions
> for this to work.  In any case, the linux kernel time
> support is getting a massive rework as we speak, so
> hopefully everything will be perfect soon :)

Works for ordinary users on Windows (certainly up to 2K) and on all
the Linuxes I've tried it on (up to Ubunto DD).

Much better of course to use OS facilities.

But my primary interest was for a high resolution clock (1e-5 seconds
or better), the monotonicity was incidental.

I see that on Windows we have that already, lucky for those of us who
have Windows as their development and target platform.

On SPARC Solaris, there certainly are permission issues wrt the
equivalent feature. I haven't tried rtdsc on x86 Solaris.