#ifndef _NTEXAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)

/**
 * The NtQueryTimerResolution routine retrieves the range and current value of the system interrupt timer.
 *
 * \param MaximumTime The maximum timer resolution, in 100-nanosecond units.
 * \param MinimumTime The minimum timer resolution, in 100-nanosecond units.
 * \param CurrentTime The current timer resolution, in 100-nanosecond units.
 * \return NTSTATUS Successful or errant status.
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtQueryTimerResolution(
    _Out_ PULONG MaximumTime,
    _Out_ PULONG MinimumTime,
    _Out_ PULONG CurrentTime
    );

#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwQueryTimerResolution(
    _Out_ PULONG MaximumTime,
    _Out_ PULONG MinimumTime,
    _Out_ PULONG CurrentTime
    );

#endif
View code on GitHub

NtDoc

No description available.

Edit description on GitHub

NTinternals.net (undocumented.ntinternals.net)

Function NtQueryTimerResolution returns resolution of system Timer in context of calling process. See also description of NtSetTimerResolution.

MinimumResolution

Means highest possible delay (in 100-ns units) between timer events.

MaximumResolution

Means lowest possible delay (in 100-ns units) between timer events.

CurrentResolution

Current timer resolution, in 100-ns units.

Documented by

Tomasz Nowak