2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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29 * @(#)time.h 8.5 (Berkeley) 5/4/95
36 #include <sys/_timeval.h>
37 #include <sys/types.h>
38 #include <sys/timespec.h>
41 int tz_minuteswest; /* minutes west of Greenwich */
42 int tz_dsttime; /* type of dst correction */
44 #define DST_NONE 0 /* not on dst */
45 #define DST_USA 1 /* USA style dst */
46 #define DST_AUST 2 /* Australian style dst */
47 #define DST_WET 3 /* Western European dst */
48 #define DST_MET 4 /* Middle European dst */
49 #define DST_EET 5 /* Eastern European dst */
50 #define DST_CAN 6 /* Canada */
59 bintime_addx(struct bintime *bt, uint64_t x)
70 bintime_add(struct bintime *bt, const struct bintime *bt2)
75 bt->frac += bt2->frac;
82 bintime_sub(struct bintime *bt, const struct bintime *bt2)
87 bt->frac -= bt2->frac;
94 bintime_mul(struct bintime *bt, u_int x)
98 p1 = (bt->frac & 0xffffffffull) * x;
99 p2 = (bt->frac >> 32) * x + (p1 >> 32);
101 bt->sec += (p2 >> 32);
102 bt->frac = (p2 << 32) | (p1 & 0xffffffffull);
105 #define bintime_clear(a) ((a)->sec = (a)->frac = 0)
106 #define bintime_isset(a) ((a)->sec || (a)->frac)
107 #define bintime_cmp(a, b, cmp) \
108 (((a)->sec == (b)->sec) ? \
109 ((a)->frac cmp (b)->frac) : \
110 ((a)->sec cmp (b)->sec))
112 #define SBT_1S ((sbintime_t)1 << 32)
113 #define SBT_1M (SBT_1S * 60)
114 #define SBT_1MS (SBT_1S / 1000)
115 #define SBT_1US (SBT_1S / 1000000)
116 #define SBT_1NS (SBT_1S / 1000000000)
119 sbintime_getsec(sbintime_t sbt)
125 static __inline sbintime_t
126 bttosbt(const struct bintime bt)
129 return (((sbintime_t)bt.sec << 32) + (bt.frac >> 32));
132 static __inline struct bintime
133 sbttobt(sbintime_t sbt)
143 * Background information:
145 * When converting between timestamps on parallel timescales of differing
146 * resolutions it is historical and scientific practice to round down rather
147 * than doing 4/5 rounding.
149 * The date changes at midnight, not at noon.
151 * Even at 15:59:59.999999999 it's not four'o'clock.
153 * time_second ticks after N.999999999 not after N.4999999999
157 bintime2timespec(const struct bintime *bt, struct timespec *ts)
160 ts->tv_sec = bt->sec;
161 ts->tv_nsec = ((uint64_t)1000000000 * (uint32_t)(bt->frac >> 32)) >> 32;
165 timespec2bintime(const struct timespec *ts, struct bintime *bt)
168 bt->sec = ts->tv_sec;
169 /* 18446744073 = int(2^64 / 1000000000) */
170 bt->frac = ts->tv_nsec * (uint64_t)18446744073LL;
174 bintime2timeval(const struct bintime *bt, struct timeval *tv)
177 tv->tv_sec = bt->sec;
178 tv->tv_usec = ((uint64_t)1000000 * (uint32_t)(bt->frac >> 32)) >> 32;
182 timeval2bintime(const struct timeval *tv, struct bintime *bt)
185 bt->sec = tv->tv_sec;
186 /* 18446744073709 = int(2^64 / 1000000) */
187 bt->frac = tv->tv_usec * (uint64_t)18446744073709LL;
190 static __inline struct timespec
191 sbttots(sbintime_t sbt)
195 ts.tv_sec = sbt >> 32;
196 ts.tv_nsec = ((uint64_t)1000000000 * (uint32_t)sbt) >> 32;
200 static __inline sbintime_t
201 tstosbt(struct timespec ts)
204 return (((sbintime_t)ts.tv_sec << 32) +
205 (ts.tv_nsec * (((uint64_t)1 << 63) / 500000000) >> 32));
208 static __inline struct timeval
209 sbttotv(sbintime_t sbt)
213 tv.tv_sec = sbt >> 32;
214 tv.tv_usec = ((uint64_t)1000000 * (uint32_t)sbt) >> 32;
218 static __inline sbintime_t
219 tvtosbt(struct timeval tv)
222 return (((sbintime_t)tv.tv_sec << 32) +
223 (tv.tv_usec * (((uint64_t)1 << 63) / 500000) >> 32));
225 #endif /* __BSD_VISIBLE */
229 /* Operations on timespecs */
230 #define timespecclear(tvp) ((tvp)->tv_sec = (tvp)->tv_nsec = 0)
231 #define timespecisset(tvp) ((tvp)->tv_sec || (tvp)->tv_nsec)
232 #define timespeccmp(tvp, uvp, cmp) \
233 (((tvp)->tv_sec == (uvp)->tv_sec) ? \
234 ((tvp)->tv_nsec cmp (uvp)->tv_nsec) : \
235 ((tvp)->tv_sec cmp (uvp)->tv_sec))
236 #define timespecadd(vvp, uvp) \
238 (vvp)->tv_sec += (uvp)->tv_sec; \
239 (vvp)->tv_nsec += (uvp)->tv_nsec; \
240 if ((vvp)->tv_nsec >= 1000000000) { \
242 (vvp)->tv_nsec -= 1000000000; \
245 #define timespecsub(vvp, uvp) \
247 (vvp)->tv_sec -= (uvp)->tv_sec; \
248 (vvp)->tv_nsec -= (uvp)->tv_nsec; \
249 if ((vvp)->tv_nsec < 0) { \
251 (vvp)->tv_nsec += 1000000000; \
255 /* Operations on timevals. */
257 #define timevalclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
258 #define timevalisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
259 #define timevalcmp(tvp, uvp, cmp) \
260 (((tvp)->tv_sec == (uvp)->tv_sec) ? \
261 ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
262 ((tvp)->tv_sec cmp (uvp)->tv_sec))
264 /* timevaladd and timevalsub are not inlined */
268 #ifndef _KERNEL /* NetBSD/OpenBSD compatible interfaces */
270 #define timerclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
271 #define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
272 #define timercmp(tvp, uvp, cmp) \
273 (((tvp)->tv_sec == (uvp)->tv_sec) ? \
274 ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
275 ((tvp)->tv_sec cmp (uvp)->tv_sec))
276 #define timeradd(tvp, uvp, vvp) \
278 (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec; \
279 (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
280 if ((vvp)->tv_usec >= 1000000) { \
282 (vvp)->tv_usec -= 1000000; \
285 #define timersub(tvp, uvp, vvp) \
287 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
288 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
289 if ((vvp)->tv_usec < 0) { \
291 (vvp)->tv_usec += 1000000; \
297 * Names of the interval timers, and structure
298 * defining a timer setting.
300 #define ITIMER_REAL 0
301 #define ITIMER_VIRTUAL 1
302 #define ITIMER_PROF 2
305 struct timeval it_interval; /* timer interval */
306 struct timeval it_value; /* current value */
310 * Getkerninfo clock information structure
313 int hz; /* clock frequency */
314 int tick; /* micro-seconds per hz tick */
316 int stathz; /* statistics clock frequency */
317 int profhz; /* profiling clock frequency */
320 /* These macros are also in time.h. */
321 #ifndef CLOCK_REALTIME
322 #define CLOCK_REALTIME 0
323 #define CLOCK_VIRTUAL 1
325 #define CLOCK_MONOTONIC 4
326 #define CLOCK_UPTIME 5 /* FreeBSD-specific. */
327 #define CLOCK_UPTIME_PRECISE 7 /* FreeBSD-specific. */
328 #define CLOCK_UPTIME_FAST 8 /* FreeBSD-specific. */
329 #define CLOCK_REALTIME_PRECISE 9 /* FreeBSD-specific. */
330 #define CLOCK_REALTIME_FAST 10 /* FreeBSD-specific. */
331 #define CLOCK_MONOTONIC_PRECISE 11 /* FreeBSD-specific. */
332 #define CLOCK_MONOTONIC_FAST 12 /* FreeBSD-specific. */
333 #define CLOCK_SECOND 13 /* FreeBSD-specific. */
334 #define CLOCK_THREAD_CPUTIME_ID 14
335 #define CLOCK_PROCESS_CPUTIME_ID 15
338 #ifndef TIMER_ABSTIME
339 #define TIMER_RELTIME 0x0 /* relative timer */
340 #define TIMER_ABSTIME 0x1 /* absolute timer */
344 #define CPUCLOCK_WHICH_PID 0
345 #define CPUCLOCK_WHICH_TID 1
351 * Kernel to clock driver interface.
353 void inittodr(time_t base);
354 void resettodr(void);
356 extern volatile time_t time_second;
357 extern volatile time_t time_uptime;
358 extern struct bintime boottimebin;
359 extern struct timeval boottime;
362 * Functions for looking at our clock: [get]{bin,nano,micro}[up]time()
364 * Functions without the "get" prefix returns the best timestamp
365 * we can produce in the given format.
367 * "bin" == struct bintime == seconds + 64 bit fraction of seconds.
368 * "nano" == struct timespec == seconds + nanoseconds.
369 * "micro" == struct timeval == seconds + microseconds.
371 * Functions containing "up" returns time relative to boot and
372 * should be used for calculating time intervals.
374 * Functions without "up" returns GMT time.
376 * Functions with the "get" prefix returns a less precise result
377 * much faster than the functions without "get" prefix and should
378 * be used where a precision of 1/hz seconds is acceptable or where
379 * performance is priority. (NB: "precision", _not_ "resolution" !)
382 void binuptime(struct bintime *bt);
383 void nanouptime(struct timespec *tsp);
384 void microuptime(struct timeval *tvp);
386 static __inline sbintime_t
392 return (bttosbt(bt));
395 void bintime(struct bintime *bt);
396 void nanotime(struct timespec *tsp);
397 void microtime(struct timeval *tvp);
399 void getbinuptime(struct bintime *bt);
400 void getnanouptime(struct timespec *tsp);
401 void getmicrouptime(struct timeval *tvp);
403 static __inline sbintime_t
409 return (bttosbt(bt));
412 void getbintime(struct bintime *bt);
413 void getnanotime(struct timespec *tsp);
414 void getmicrotime(struct timeval *tvp);
416 /* Other functions */
417 int itimerdecr(struct itimerval *itp, int usec);
418 int itimerfix(struct timeval *tv);
419 int ppsratecheck(struct timeval *, int *, int);
420 int ratecheck(struct timeval *, const struct timeval *);
421 void timevaladd(struct timeval *t1, const struct timeval *t2);
422 void timevalsub(struct timeval *t1, const struct timeval *t2);
423 int tvtohz(struct timeval *tv);
427 #include <sys/cdefs.h>
428 #include <sys/select.h>
431 int setitimer(int, const struct itimerval *, struct itimerval *);
432 int utimes(const char *, const struct timeval *);
435 int adjtime(const struct timeval *, struct timeval *);
436 int clock_getcpuclockid2(id_t, int, clockid_t *);
437 int futimes(int, const struct timeval *);
438 int futimesat(int, const char *, const struct timeval [2]);
439 int lutimes(const char *, const struct timeval *);
440 int settimeofday(const struct timeval *, const struct timezone *);
444 int getitimer(int, struct itimerval *);
445 int gettimeofday(struct timeval *, struct timezone *);
450 #endif /* !_KERNEL */
452 #endif /* !_SYS_TIME_H_ */