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 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
