Undocumented functions of NTDLL

2OO1, 25 February



NtSetIntervalProfile
NtSetIntervalProfile

NTSYSAPI 
NTSTATUS
NTAPI

NtSetIntervalProfile(


  IN ULONG                Interval,
  IN KPROFILE_SOURCE      Source );



Function NtSetIntervalProfile sets delay between performance counter's ticks. Setting profile's interval has global effect for all running processes.

User can set interval only for software performance counters. To determine if counter is software or not, call NtQueryIntervalProfile. If returned interval is zero, queried counter is hardware counter (build in CPU).


  • Interval
    •     New interval, in ms.
  • Source
    •     Performance counter's identifier, defined in KPROFILE_SOURCE enumeration type.


    Documented by:
    Tomasz Nowak



    Requirements:
    Library: ntdll.lib


    See also:
    KPROFILE_SOURCE
    NtCreateProfile
    NtQueryIntervalProfile