ExQueryTimerResolution - NtDoc
Native API online documentation, based on the System Informer
(formerly Process Hacker) phnt
headers
// wdm.h
VOID ExQueryTimerResolution(
[out] PULONG MaximumTime,
[out] PULONG MinimumTime,
[out] PULONG CurrentTime
);
View the official Windows Driver Kit DDI referenceNo description available.
The ExQueryTimerResolution routine reports the range of timer resolutions that are supported by the system clock.
MaximumTime [out]A pointer to a location to which the routine writes the maximum time interval, in 100-nanosecond units, between successive ticks of the system clock. A tick is an interrupt caused by the system clock timer.
MinimumTime [out]A pointer to a location to which the routine writes the minimum time interval, in 100-nanosecond units, between successive ticks of the system clock.
CurrentTime [out]A pointer to a location to which the routine writes the current time interval, in 100-nanosecond units, between successive ticks of the system clock.
If your driver calls the ExSetTimerResolution routine to change the time interval between successive system clock interrupts, the driver can first call ExQueryTimerResolution to determine the range of intervals supported by the system clock.
When your driver calls a routine such as KeSetTimerEx to set a timer, the accuracy of the timer depends on the resolution of the system clock. For more information, see Timer Accuracy.