RtlSetTimer - NtDoc

#ifndef _NTRTL_H

NTSYSAPI
NTSTATUS
NTAPI
RtlSetTimer(
    _In_ HANDLE TimerQueueHandle,
    _Out_ PHANDLE Handle,
    _In_ WAITORTIMERCALLBACKFUNC Function,
    _In_opt_ PVOID Context,
    _In_ ULONG DueTime,
    _In_ ULONG Period,
    _In_ ULONG Flags
    );

#endif
View code on GitHub

#ifndef _NTRTL_FWD_H
// begin_forwarders
#ifndef PHNT_INLINE_NAME_FORWARDERS

#define RtlSetTimer RtlCreateTimer

#endif
// end_forwarders
#endif
View code on GitHub