ntoskrnl/tests/TestTimer.c

   1 #include <stdio.h>
   2 #include <conio.h>
   3 #include <windows.h>
   4
   5 void main ( int argc, char** argv, char** environ )
   6 {
   7  LARGE_INTEGER liFrequency;
   8  LARGE_INTEGER liStartTime;
   9  LARGE_INTEGER liCurrentTime;
  10
  11  QueryPerformanceFrequency ( &liFrequency );
  12  printf ( "HIGH RESOLUTION PERFOMANCE COUNTER Frequency = %I64d CLOCKS IN SECOND\n",
  13              liFrequency.QuadPart );
  14
  15
  16  if (liFrequency.QuadPart == 0)
  17  {
  18         printf("Your computer does not support High Resolution Performance counter\n");
  19         return;
  20  }
  21
  22  printf ( "Press <ENTER> to start test...\n" );
  23  getchar();
  24
  25  printf ( "\nPress any key to quit test\n\n" );
  26  QueryPerformanceCounter ( &liStartTime );
  27  for (;;)
  28  {
  29         QueryPerformanceCounter ( &liCurrentTime );
  30         printf("Elapsed Time : %8.6f mSec\r",
  31           ((double)( (liCurrentTime.QuadPart - liStartTime.QuadPart)* (double)1000.0/(double)liFrequency.QuadPart )) );
  32         if (_kbhit())
  33                 break;
  34  }
  35
  36
  37 }