QueryPerformanceCounter

Description

Retrieves the current value of the high-resolution performance counter.

Syntax

n = QueryPerformanceCounter

Returns

Number

Parameters

Name	Type	Optional	Meaning

Remarks

Important notes

QueryPerformanceCounter and QueryPerformanceFrequency offer a bit better resolution, but have different issues. For example in Windows XP, all AMD Athlon X2 dual core CPUs return the PC of either of the cores "randomly" (the PC sometimes jumps a bit backwards), unless you specially install AMD dual core driver package to fix the issue. We haven't noticed any other dual+ core CPUs having similar issues (p4 dual, p4 ht, core2 dual, core2 quad, phenom quad).

More info: http://www.virtualdub.org/blog/pivot/entry.php?id=106

Restrictions