From: William Kempf (williamkempf_at_[hidden])
Date: 2002-07-01 06:55:23
>From: "Simon J. Julier" <sjulier_at_[hidden]>
>A colleague of mine (Reinhold Behringer at RSC) drew my attention to the
>fact that there is a problem with the Windows implementation of
>xtime_get(.) because it uses GetSystemTimeAsFileTime. There are two
>documented problems with this Win32 API function:
>1. The Windows system timer runs between 10ms and 55ms, depending on the
>version of Windows used
>me_5h2d.asp). Reinhold tells me that the value returned by
>GetSystemTimeAsFileTime seems to update at the same rate.
This one I consider a non-issue. The xtime stuff does not promise any kind
of granularity, so a 10-55ms variation on different Windows platforms is not
a "violation" of the implied contract here.
>2. "If GetSystemTimeAsFileTime() is called at the precise split second
>during which the date changes from one day to the next (12:00:00.000 AM),
>the API may return a value indicating 12:00 AM for the previous day."
>http://support.microsoft.com/default.aspx?scid=kb;EN-US;q224423). This bug
>affects Windows 9x and Me.
This is a little more troubling, but it seems fairly unlikely to be an
actual issue. I'll check the KB article for work arounds (probably just
call it twice if it reports 12:00 AM) and apply them for the next release.
>Has anybody looked at these issues?
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