Undocumented functions of NTDLL

2OOO, 24 November

NTSYSAPI 
NTSTATUS
NTAPI


NtQueryPerformanceCounter(



  OUT PLARGE_INTEGER      PerformanceCounter,
  OUT PLARGE_INTEGER      PerformanceFrequency OPTIONAL );

• PerformanceCounter     Result is number of processor ticks after last reset.

• PerformanceFrequency     It's number of processor ticks per one second.
  
  

UpTime = PerformanceCounter / PerformanceFrequency;

Documented by:

Sven B. Schreiber

Tomasz Nowak

Library: ntdll.lib