rostests/apitests/ntdll/Timer.c

   1 /*
   2  * PROJECT:         ReactOS API tests
   3  * LICENSE:         GPL - See COPYING in the top level directory
   4  * PURPOSE:         Test for NtQueryTimerResolution and NtSetTimerResolution.
   5  * PROGRAMMER:      Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
   6  */
   7
   8 #define WIN32_NO_STATUS
   9 #include <wine/test.h>
  10 #include <ndk/ketypes.h>
  11 #include <ndk/kefuncs.h>
  12
  13 #include <stdio.h>
  14
  15 START_TEST(TimerResolution)
  16 {
  17     NTSTATUS Status;
  18     ULONG CurrentResolution;
  19     ULONG MinimumResolution;
  20     ULONG MaximumResolution;
  21     ULONG CurrentResolution2;
  22
  23     /* Get the current timer resolution */
  24     Status = NtSetTimerResolution(0,        /* Ignored */
  25                                   FALSE,    /* Don't change resolution */
  26                                   &CurrentResolution);
  27
  28     /*
  29      * When not setting the resolution, it always
  30      * returns STATUS_TIMER_RESOLUTION_NOT_SET
  31      */
  32     ok_hex(Status, STATUS_TIMER_RESOLUTION_NOT_SET);
  33
  34     /*
  35      * Get the timer resolution limits and current timer resolution
  36      * using a different method
  37      */
  38     Status = NtQueryTimerResolution(&MinimumResolution,
  39                                     &MaximumResolution,
  40                                     &CurrentResolution2);
  41
  42     /* This function should always return STATUS_SUCCESS */
  43     ok_hex(Status, STATUS_SUCCESS);
  44
  45     /* These two values should be the same */
  46     ok_hex(CurrentResolution, CurrentResolution2);
  47
  48     /*
  49      * Even if you give it invalid values,
  50      * NtSetTimerResolution will return STATUS_SUCCESS,
  51      * but it will not change the resolution.
  52      */
  53     Status = NtSetTimerResolution(MinimumResolution - 1,
  54                                   TRUE,
  55                                   &CurrentResolution);
  56     ok_hex(Status, STATUS_SUCCESS);
  57     printf("Current resolution: %d ; minimum resolution: %d\n", CurrentResolution, MinimumResolution);
  58     ok(CurrentResolution >= MinimumResolution, "Current resolution: %d became too low! (minimum resolution: %d)\n", CurrentResolution, MinimumResolution);
  59
  60     Status = NtSetTimerResolution(MaximumResolution + 1,
  61                                   TRUE,
  62                                   &CurrentResolution);
  63     ok_hex(Status, STATUS_SUCCESS);
  64     printf("Current resolution: %d ; maximum resolution: %d\n", CurrentResolution, MaximumResolution);
  65     ok(CurrentResolution <= MaximumResolution, "Current resolution: %d became too high! (maximum resolution: %d)\n", CurrentResolution, MaximumResolution);
  66 }