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 
90