tests/unit/test-timed-average.c

   1 /*
   2  * Timed average computation tests
   3  *
   4  * Copyright Nodalink, EURL. 2014
   5  *
   6  * Authors:
   7  *  Benoît Canet     <benoit.canet@nodalink.com>
   8  *
   9  * This work is licensed under the terms of the GNU LGPL, version 2 or later.
  10  * See the COPYING.LIB file in the top-level directory.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include "sysemu/cpu-timers.h"
  15 #include "qemu/timed-average.h"
  16
  17 /* This is the clock for QEMU_CLOCK_VIRTUAL */
  18 static int64_t my_clock_value;
  19
  20 int64_t cpu_get_clock(void)
  21 {
  22     return my_clock_value;
  23 }
  24
  25 static void account(TimedAverage *ta)
  26 {
  27     timed_average_account(ta, 1);
  28     timed_average_account(ta, 5);
  29     timed_average_account(ta, 2);
  30     timed_average_account(ta, 4);
  31     timed_average_account(ta, 3);
  32 }
  33
  34 static void test_average(void)
  35 {
  36     TimedAverage ta;
  37     uint64_t result;
  38     int i;
  39
  40     /* we will compute some average on a period of 1 second */
  41     timed_average_init(&ta, QEMU_CLOCK_VIRTUAL, NANOSECONDS_PER_SECOND);
  42
  43     result = timed_average_min(&ta);
  44     g_assert(result == 0);
  45     result = timed_average_avg(&ta);
  46     g_assert(result == 0);
  47     result = timed_average_max(&ta);
  48     g_assert(result == 0);
  49
  50     for (i = 0; i < 100; i++) {
  51         account(&ta);
  52         result = timed_average_min(&ta);
  53         g_assert(result == 1);
  54         result = timed_average_avg(&ta);
  55         g_assert(result == 3);
  56         result = timed_average_max(&ta);
  57         g_assert(result == 5);
  58         my_clock_value += NANOSECONDS_PER_SECOND / 10;
  59     }
  60
  61     my_clock_value += NANOSECONDS_PER_SECOND * 100;
  62
  63     result = timed_average_min(&ta);
  64     g_assert(result == 0);
  65     result = timed_average_avg(&ta);
  66     g_assert(result == 0);
  67     result = timed_average_max(&ta);
  68     g_assert(result == 0);
  69
  70     for (i = 0; i < 100; i++) {
  71         account(&ta);
  72         result = timed_average_min(&ta);
  73         g_assert(result == 1);
  74         result = timed_average_avg(&ta);
  75         g_assert(result == 3);
  76         result = timed_average_max(&ta);
  77         g_assert(result == 5);
  78         my_clock_value += NANOSECONDS_PER_SECOND / 10;
  79     }
  80 }
  81
  82 int main(int argc, char **argv)
  83 {
  84     /* tests in the same order as the header function declarations */
  85     g_test_init(&argc, &argv, NULL);
  86     g_test_add_func("/timed-average/average", test_average);
  87     return g_test_run();
  88 }
  89