High-Resolution Timer
A counter is a general term used in programming to refer to an incrementing
variable. Some systems include a
high-resolution performance counter that provides high-resolution elapsed times.
If a high-resolution performance counter exists on the system, the
QueryPerformanceFrequency function can be used to express the frequency, in counts per second. The
value of the count is processor dependent. On some processors, for example, the
count might be the cycle rate of the processor clock.
The
QueryPerformanceCounter function retrieves the current value of the high-resolution performance
counter (if one exists on the system). By calling this function at the beginning and
end of a section of code, an application essentially uses the counter as a
high-resolution timer. For example, suppose that
QueryPerformanceFrequency indicates that the frequency of the high-resolution performance counter is
50,000 counts per second. If the application calls
QueryPerformanceCounter immediately before and immediately after the section of code to be timed, the
counter values might be 1500 counts and 3500 counts, respectively. These
values would indicate that .04 seconds (2000 counts) elapsed while the code
executed.
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