VOID EngQueryPerformanceCounter(
| LONGLONG *pPerformanceCount | |
| ); |
EngQueryPerformanceCounter queries the performance counter.
Parameters
pPerformanceCount
Pointer to a location in which the performance counter value, in hertz, is returned.
Comments
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.
See Also