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EngQueryPerformanceCounter function (winddi.h)

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The EngQueryPerformanceCounter function queries the performance counter.

Syntax

ENGAPI VOID EngQueryPerformanceCounter(
  [out] LONGLONG *pPerformanceCount
);

Parameters

[out] pPerformanceCount

Pointer to a location that receives the performance counter value, in hertz.

Return value

None

Remarks

EngQueryPerformanceCounter always returns a 64-bit integer that represents the number of ticks per second. The count begins accumulating when the system is booted.

A driver should call this routine sparingly. Frequent calls to EngQueryPerformanceCounter can degrade the I/O performance for the calling driver and for the system as a whole.

Requirements

Requirement Value
Minimum supported client Available in Windows 2000 and later versions of the Windows operating systems.
Target Platform Universal
Header winddi.h (include Winddi.h)
Library Win32k.lib
DLL Win32k.sys

See also

EngQueryPerformanceFrequency