| clock.c (1574) | clock.c (6167) |
|---|---|
| 1/* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright --- 26 unchanged lines hidden (view full) --- 35static char sccsid[] = "@(#)clock.c 8.1 (Berkeley) 6/4/93"; 36#endif /* LIBC_SCCS and not lint */ 37 38#include <sys/param.h> 39#include <sys/time.h> 40#include <sys/resource.h> 41 42/* | 1/* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright --- 26 unchanged lines hidden (view full) --- 35static char sccsid[] = "@(#)clock.c 8.1 (Berkeley) 6/4/93"; 36#endif /* LIBC_SCCS and not lint */ 37 38#include <sys/param.h> 39#include <sys/time.h> 40#include <sys/resource.h> 41 42/* |
| 43 * Convert usec to clock ticks; could do (usec * CLK_TCK) / 1000000, | 43 * Convert usec to clock ticks; could do (usec * CLOCKS_PER_SEC) / 1000000, |
| 44 * but this would overflow if we switch to nanosec. 45 */ | 44 * but this would overflow if we switch to nanosec. 45 */ |
| 46#define CONVTCK(r) (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK)) | 46#define CONVTCK(r) ((r).tv_sec * CLOCKS_PER_SEC \ 47 + (r).tv_usec / (1000000 / CLOCKS_PER_SEC)) |
| 47 48clock_t 49clock() 50{ 51 struct rusage ru; 52 53 if (getrusage(RUSAGE_SELF, &ru)) 54 return ((clock_t) -1); 55 return((clock_t)((CONVTCK(ru.ru_utime) + CONVTCK(ru.ru_stime)))); 56} | 48 49clock_t 50clock() 51{ 52 struct rusage ru; 53 54 if (getrusage(RUSAGE_SELF, &ru)) 55 return ((clock_t) -1); 56 return((clock_t)((CONVTCK(ru.ru_utime) + CONVTCK(ru.ru_stime)))); 57} |