RtQueryPerformanceFrequency

RtQueryPerformanceFrequency retrieves the frequency of the high-resolution performance counter (based on the processor’s time-stamp counter, TSC). The frequency cannot change while the system is running.

Syntax

BOOL RtQueryPerformanceFrequency(
    LARGE_INTEGER* lpFrequency);

Parameters

lpFrequency

Pointer to a variable that receives the performance-counter frequency, in counts per second.

Return Value

If the function succeeds, it returns a non-zero value. If the function fails, it returns 0 (zero). To get extended error information, call GetLastError.

Remarks

In a process, QueryPerformanceFrequency is the same as RtQueryPerformanceFrequency. QueryPerformanceCounter is the same as RtQueryPerformanceCounter.

See Also:

• RtQueryPerformanceCounter