[Vm-dev] Fwd: [Pharo-project] System time
Levente Uzonyi
leves at elte.hu
Wed May 4 02:10:43 UTC 2011
On Tue, 3 May 2011, Eliot Miranda wrote:
> Its because on linux & mac the clock is derived from gettimeofday which is
> wall time but on Windows it is derived from timeGetTime which isn't. The
> problem is the lack of a high-resolution wall time on Windows.
> GetSystemTimeAsFileTime et al have something like 16 ms resolution whereas
> timeGetTime has 1ms resolution.
On vista the accuracy of GetLocalTime (which is a "friend" of
GetSystemTimeAsFileTime) seems to be 1ms. E.g.:
s := Set new.
[ s size < 10 ] whileTrue: [ s add: Win32SystemTime localDateAndTime ].
s sorted
Output:
{2011-05-04T04:03:40.049+02:00 . 2011-05-04T04:03:40.05+02:00 .
2011-05-04T04:03:40.051+02:00 . 2011-05-04T04:03:40.052+02:00 .
2011-05-04T04:03:40.053+02:00 . 2011-05-04T04:03:40.054+02:00 .
2011-05-04T04:03:40.055+02:00 . 2011-05-04T04:03:40.056+02:00 .
2011-05-04T04:03:40.057+02:00 . 2011-05-04T04:03:40.058+02:00}
Levente
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