1 /*
2 * Copyright (c) 2002, Intel Corporation. All rights reserved.
3 * Created by: julie.n.fleischer REMOVE-THIS AT intel DOT com
4 * This file is licensed under the GPL license. For the full content
5 * of this license, see the COPYING file at the top level of this
6 * source tree.
7 *
8 * Test that clock() returns a clock_t containing the processor time
9 * since a specific point in time.
10 * Dividing the return value by CLOCKS_PER_SEC gives time in seconds.
11 *
12 * 12/17/02 - Checking in correction made by
13 * jim.houston REMOVE-THIS AT attbi DOT com
14 * Test needed to do something as opposed to idle sleep to
15 * get the CPU time to increase.
16 */
17 #include <time.h>
18 #include <stdio.h>
19 #include <unistd.h>
20 #include "posixtest.h"
21
22 #define LARGENUMBER 8000000
main(void)23 int main(void)
24 {
25 clock_t c1, c2;
26 double sec1, sec2;
27 int i;
28
29 c1 = clock();
30 sec1 = c1 / CLOCKS_PER_SEC;
31
32 for (i = 0; i < LARGENUMBER; i++) {
33 // keep busy so CPU time increases
34 clock();
35 }
36
37 c2 = clock();
38 sec2 = c2 / CLOCKS_PER_SEC;
39
40 if (sec2 > sec1) {
41 printf("Times T1=%.2f, T2=%.2f\n", sec1, sec2);
42 printf("Test PASSED\n");
43 return PTS_PASS;
44 } else {
45 if (sec2 < sec1) {
46 /*
47 * probably wrapping happened; however, since
48 * we do not know the wrap value, results are
49 * undefined
50 */
51 printf("TEST AGAIN: Times probably wrapped\n");
52 return PTS_UNRESOLVED;
53 } else {
54 printf("Error with processor times T1=%.2f, T2=%.2f\n",
55 sec1, sec2);
56 return PTS_FAIL;
57 }
58 }
59
60 return PTS_UNRESOLVED;
61 }
62