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 <time.h>
21 #include "posixtest.h"
22
23 #define BUSY_LOOP_SECONDS 5
24
main(void)25 int main(void)
26 {
27 clock_t c1, c2;
28 double sec1, sec2;
29 time_t end;
30
31 c1 = clock();
32 sec1 = c1 / CLOCKS_PER_SEC;
33
34 end = time(NULL) + BUSY_LOOP_SECONDS;
35
36 while (end >= time(NULL)) {
37 clock();
38 }
39
40 c2 = clock();
41 sec2 = c2 / CLOCKS_PER_SEC;
42
43 if (sec2 > sec1) {
44 printf("Times T1=%.2f, T2=%.2f\n", sec1, sec2);
45 printf("Test PASSED\n");
46 return PTS_PASS;
47 } else {
48 if (sec2 < sec1) {
49 /*
50 * probably wrapping happened; however, since
51 * we do not know the wrap value, results are
52 * undefined
53 */
54 printf("TEST AGAIN: Times probably wrapped\n");
55 return PTS_UNRESOLVED;
56 } else {
57 printf("Error with processor times T1=%.2f, T2=%.2f\n",
58 sec1, sec2);
59 return PTS_FAIL;
60 }
61 }
62
63 return PTS_UNRESOLVED;
64 }
65