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 #include <apitest.h>
   9
  10 #define WIN32_NO_STATUS
  11 #include <ndk/ketypes.h>
  12 #include <ndk/kefuncs.h>
  13
  14 #include <stdio.h>
  15
  16 START_TEST(TimerResolution)
  17 {
  18     NTSTATUS Status;
  19     ULONG CurrentResolution;
  20     ULONG MinimumResolution;
  21     ULONG MaximumResolution;
  22     ULONG CurrentResolution2;
  23
  24     /* Get the current timer resolution */
  25     Status = NtSetTimerResolution(0,        /* Ignored */
  26                                   FALSE,    /* Don't change resolution */
  27                                   &CurrentResolution);
  28
  29     /*
  30      * If the timer resolution hasn't been changed for this process,
  31      * it returns STATUS_TIMER_RESOLUTION_NOT_SET
  32      */
  33     ok_hex(Status, STATUS_TIMER_RESOLUTION_NOT_SET);
  34
  35     /*
  36      * Get the timer resolution limits and current timer resolution
  37      * using a different method
  38      */
  39     Status = NtQueryTimerResolution(&MinimumResolution,
  40                                     &MaximumResolution,
  41                                     &CurrentResolution2);
  42
  43     /* This function should always return STATUS_SUCCESS */
  44     ok_hex(Status, STATUS_SUCCESS);
  45
  46     /* The MinimumResolution should be higher than the MaximumResolution */
  47     ok(MinimumResolution >= MaximumResolution, "MaximumResolution higher than MinimumResolution!\n");
  48
  49     /* These two values should be the same */
  50     ok_hex(CurrentResolution, CurrentResolution2);
  51
  52     /*
  53      * Even if you give it invalid values,
  54      * NtSetTimerResolution will return STATUS_SUCCESS,
  55      * but it will not change the resolution.
  56      */
  57     Status = NtSetTimerResolution(MinimumResolution + 1,
  58                                   TRUE,
  59                                   &CurrentResolution);
  60     ok_hex(Status, STATUS_SUCCESS);
  61     printf("Current resolution: %lu ; minimum resolution: %lu\n", CurrentResolution, MinimumResolution);
  62     ok(CurrentResolution <= MinimumResolution, "Current resolution: %lu became too high! (minimum resolution: %lu)\n", CurrentResolution, MinimumResolution);
  63
  64     Status = NtSetTimerResolution(MaximumResolution - 1,
  65                                   TRUE,
  66                                   &CurrentResolution);
  67     ok_hex(Status, STATUS_SUCCESS);
  68     printf("Current resolution: %lu ; maximum resolution: %lu\n", CurrentResolution, MaximumResolution);
  69     ok(CurrentResolution >= MaximumResolution, "Current resolution: %lu became too low! (maximum resolution: %lu)\n", CurrentResolution, MaximumResolution);
  70
  71     /* Get the current timer resolution */
  72     Status = NtSetTimerResolution(0,        /* Ignored */
  73                                   FALSE,    /* Don't change resolution */
  74                                   &CurrentResolution);
  75
  76     /* Since we have changed the resolution earlier, it returns STATUS_SUCCESS. */
  77     ok_hex(Status, STATUS_SUCCESS);
  78
  79     /* Get the current timer resolution again */
  80     Status = NtSetTimerResolution(0,        /* Ignored */
  81                                   FALSE,    /* Don't change resolution */
  82                                   &CurrentResolution);
  83
  84     /* The resolution is not changed now, so it should return STATUS_TIMER_RESOLUTION_NOT_SET */
  85     ok_hex(Status, STATUS_TIMER_RESOLUTION_NOT_SET);
  86 }