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.
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12 * documentation and/or other materials provided with the distribution.
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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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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;
78 _bt->sec += _bt2->sec;
82 bintime_sub(struct bintime *_bt, const struct bintime *_bt2)
87 _bt->frac -= _bt2->frac;
90 _bt->sec -= _bt2->sec;
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);
106 bintime_shift(struct bintime *_bt, int _exp)
111 _bt->sec |= _bt->frac >> (64 - _exp);
113 } else if (_exp < 0) {
115 _bt->frac |= (uint64_t)_bt->sec << (64 + _exp);
120 #define bintime_clear(a) ((a)->sec = (a)->frac = 0)
121 #define bintime_isset(a) ((a)->sec || (a)->frac)
122 #define bintime_cmp(a, b, cmp) \
123 (((a)->sec == (b)->sec) ? \
124 ((a)->frac cmp (b)->frac) : \
125 ((a)->sec cmp (b)->sec))
127 #define SBT_1S ((sbintime_t)1 << 32)
128 #define SBT_1M (SBT_1S * 60)
129 #define SBT_1MS (SBT_1S / 1000)
130 #define SBT_1US (SBT_1S / 1000000)
131 #define SBT_1NS (SBT_1S / 1000000000)
134 sbintime_getsec(sbintime_t _sbt)
140 static __inline sbintime_t
141 bttosbt(const struct bintime _bt)
144 return (((sbintime_t)_bt.sec << 32) + (_bt.frac >> 32));
147 static __inline struct bintime
148 sbttobt(sbintime_t _sbt)
152 _bt.sec = _sbt >> 32;
153 _bt.frac = _sbt << 32;
158 * Background information:
160 * When converting between timestamps on parallel timescales of differing
161 * resolutions it is historical and scientific practice to round down rather
162 * than doing 4/5 rounding.
164 * The date changes at midnight, not at noon.
166 * Even at 15:59:59.999999999 it's not four'o'clock.
168 * time_second ticks after N.999999999 not after N.4999999999
172 bintime2timespec(const struct bintime *_bt, struct timespec *_ts)
175 _ts->tv_sec = _bt->sec;
176 _ts->tv_nsec = ((uint64_t)1000000000 *
177 (uint32_t)(_bt->frac >> 32)) >> 32;
181 timespec2bintime(const struct timespec *_ts, struct bintime *_bt)
184 _bt->sec = _ts->tv_sec;
185 /* 18446744073 = int(2^64 / 1000000000) */
186 _bt->frac = _ts->tv_nsec * (uint64_t)18446744073LL;
190 bintime2timeval(const struct bintime *_bt, struct timeval *_tv)
193 _tv->tv_sec = _bt->sec;
194 _tv->tv_usec = ((uint64_t)1000000 * (uint32_t)(_bt->frac >> 32)) >> 32;
198 timeval2bintime(const struct timeval *_tv, struct bintime *_bt)
201 _bt->sec = _tv->tv_sec;
202 /* 18446744073709 = int(2^64 / 1000000) */
203 _bt->frac = _tv->tv_usec * (uint64_t)18446744073709LL;
206 static __inline struct timespec
207 sbttots(sbintime_t _sbt)
211 _ts.tv_sec = _sbt >> 32;
212 _ts.tv_nsec = ((uint64_t)1000000000 * (uint32_t)_sbt) >> 32;
216 static __inline sbintime_t
217 tstosbt(struct timespec _ts)
220 return (((sbintime_t)_ts.tv_sec << 32) +
221 (_ts.tv_nsec * (((uint64_t)1 << 63) / 500000000) >> 32));
224 static __inline struct timeval
225 sbttotv(sbintime_t _sbt)
229 _tv.tv_sec = _sbt >> 32;
230 _tv.tv_usec = ((uint64_t)1000000 * (uint32_t)_sbt) >> 32;
234 static __inline sbintime_t
235 tvtosbt(struct timeval _tv)
238 return (((sbintime_t)_tv.tv_sec << 32) +
239 (_tv.tv_usec * (((uint64_t)1 << 63) / 500000) >> 32));
241 #endif /* __BSD_VISIBLE */
245 /* Operations on timespecs */
246 #define timespecclear(tvp) ((tvp)->tv_sec = (tvp)->tv_nsec = 0)
247 #define timespecisset(tvp) ((tvp)->tv_sec || (tvp)->tv_nsec)
248 #define timespeccmp(tvp, uvp, cmp) \
249 (((tvp)->tv_sec == (uvp)->tv_sec) ? \
250 ((tvp)->tv_nsec cmp (uvp)->tv_nsec) : \
251 ((tvp)->tv_sec cmp (uvp)->tv_sec))
252 #define timespecadd(vvp, uvp) \
254 (vvp)->tv_sec += (uvp)->tv_sec; \
255 (vvp)->tv_nsec += (uvp)->tv_nsec; \
256 if ((vvp)->tv_nsec >= 1000000000) { \
258 (vvp)->tv_nsec -= 1000000000; \
261 #define timespecsub(vvp, uvp) \
263 (vvp)->tv_sec -= (uvp)->tv_sec; \
264 (vvp)->tv_nsec -= (uvp)->tv_nsec; \
265 if ((vvp)->tv_nsec < 0) { \
267 (vvp)->tv_nsec += 1000000000; \
271 /* Operations on timevals. */
273 #define timevalclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
274 #define timevalisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
275 #define timevalcmp(tvp, uvp, cmp) \
276 (((tvp)->tv_sec == (uvp)->tv_sec) ? \
277 ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
278 ((tvp)->tv_sec cmp (uvp)->tv_sec))
280 /* timevaladd and timevalsub are not inlined */
284 #ifndef _KERNEL /* NetBSD/OpenBSD compatible interfaces */
286 #define timerclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
287 #define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
288 #define timercmp(tvp, uvp, cmp) \
289 (((tvp)->tv_sec == (uvp)->tv_sec) ? \
290 ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
291 ((tvp)->tv_sec cmp (uvp)->tv_sec))
292 #define timeradd(tvp, uvp, vvp) \
294 (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec; \
295 (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
296 if ((vvp)->tv_usec >= 1000000) { \
298 (vvp)->tv_usec -= 1000000; \
301 #define timersub(tvp, uvp, vvp) \
303 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
304 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
305 if ((vvp)->tv_usec < 0) { \
307 (vvp)->tv_usec += 1000000; \
313 * Names of the interval timers, and structure
314 * defining a timer setting.
316 #define ITIMER_REAL 0
317 #define ITIMER_VIRTUAL 1
318 #define ITIMER_PROF 2
321 struct timeval it_interval; /* timer interval */
322 struct timeval it_value; /* current value */
326 * Getkerninfo clock information structure
329 int hz; /* clock frequency */
330 int tick; /* micro-seconds per hz tick */
332 int stathz; /* statistics clock frequency */
333 int profhz; /* profiling clock frequency */
336 /* These macros are also in time.h. */
337 #ifndef CLOCK_REALTIME
338 #define CLOCK_REALTIME 0
339 #define CLOCK_VIRTUAL 1
341 #define CLOCK_MONOTONIC 4
342 #define CLOCK_UPTIME 5 /* FreeBSD-specific. */
343 #define CLOCK_UPTIME_PRECISE 7 /* FreeBSD-specific. */
344 #define CLOCK_UPTIME_FAST 8 /* FreeBSD-specific. */
345 #define CLOCK_REALTIME_PRECISE 9 /* FreeBSD-specific. */
346 #define CLOCK_REALTIME_FAST 10 /* FreeBSD-specific. */
347 #define CLOCK_MONOTONIC_PRECISE 11 /* FreeBSD-specific. */
348 #define CLOCK_MONOTONIC_FAST 12 /* FreeBSD-specific. */
349 #define CLOCK_SECOND 13 /* FreeBSD-specific. */
350 #define CLOCK_THREAD_CPUTIME_ID 14
351 #define CLOCK_PROCESS_CPUTIME_ID 15
354 #ifndef TIMER_ABSTIME
355 #define TIMER_RELTIME 0x0 /* relative timer */
356 #define TIMER_ABSTIME 0x1 /* absolute timer */
360 #define CPUCLOCK_WHICH_PID 0
361 #define CPUCLOCK_WHICH_TID 1
367 * Kernel to clock driver interface.
369 void inittodr(time_t base);
370 void resettodr(void);
372 extern volatile time_t time_second;
373 extern volatile time_t time_uptime;
374 extern struct bintime boottimebin;
375 extern struct timeval boottime;
376 extern struct bintime tc_tick_bt;
377 extern sbintime_t tc_tick_sbt;
378 extern struct bintime tick_bt;
379 extern sbintime_t tick_sbt;
380 extern int tc_precexp;
381 extern int tc_timepercentage;
382 extern struct bintime bt_timethreshold;
383 extern struct bintime bt_tickthreshold;
384 extern sbintime_t sbt_timethreshold;
385 extern sbintime_t sbt_tickthreshold;
388 * Functions for looking at our clock: [get]{bin,nano,micro}[up]time()
390 * Functions without the "get" prefix returns the best timestamp
391 * we can produce in the given format.
393 * "bin" == struct bintime == seconds + 64 bit fraction of seconds.
394 * "nano" == struct timespec == seconds + nanoseconds.
395 * "micro" == struct timeval == seconds + microseconds.
397 * Functions containing "up" returns time relative to boot and
398 * should be used for calculating time intervals.
400 * Functions without "up" returns GMT time.
402 * Functions with the "get" prefix returns a less precise result
403 * much faster than the functions without "get" prefix and should
404 * be used where a precision of 1/hz seconds is acceptable or where
405 * performance is priority. (NB: "precision", _not_ "resolution" !)
408 void binuptime(struct bintime *bt);
409 void nanouptime(struct timespec *tsp);
410 void microuptime(struct timeval *tvp);
412 static __inline sbintime_t
418 return (bttosbt(_bt));
421 void bintime(struct bintime *bt);
422 void nanotime(struct timespec *tsp);
423 void microtime(struct timeval *tvp);
425 void getbinuptime(struct bintime *bt);
426 void getnanouptime(struct timespec *tsp);
427 void getmicrouptime(struct timeval *tvp);
429 static __inline sbintime_t
435 return (bttosbt(_bt));
438 void getbintime(struct bintime *bt);
439 void getnanotime(struct timespec *tsp);
440 void getmicrotime(struct timeval *tvp);
442 /* Other functions */
443 int itimerdecr(struct itimerval *itp, int usec);
444 int itimerfix(struct timeval *tv);
445 int ppsratecheck(struct timeval *, int *, int);
446 int ratecheck(struct timeval *, const struct timeval *);
447 void timevaladd(struct timeval *t1, const struct timeval *t2);
448 void timevalsub(struct timeval *t1, const struct timeval *t2);
449 int tvtohz(struct timeval *tv);
451 #define TC_DEFAULTPERC 5
453 #define BT2FREQ(bt) \
454 (((uint64_t)0x8000000000000000 + ((bt)->frac >> 2)) / \
457 #define SBT2FREQ(sbt) ((SBT_1S + ((sbt) >> 1)) / (sbt))
459 #define FREQ2BT(freq, bt) \
462 (bt)->frac = ((uint64_t)0x8000000000000000 / (freq)) << 1; \
465 #define TIMESEL(sbt, sbt2) \
466 (((sbt2) >= sbt_timethreshold) ? \
467 ((*(sbt) = getsbinuptime()), 1) : ((*(sbt) = sbinuptime()), 0))
472 #include <sys/cdefs.h>
473 #include <sys/select.h>
476 int setitimer(int, const struct itimerval *, struct itimerval *);
477 int utimes(const char *, const struct timeval *);
480 int adjtime(const struct timeval *, struct timeval *);
481 int clock_getcpuclockid2(id_t, int, clockid_t *);
482 int futimes(int, const struct timeval *);
483 int futimesat(int, const char *, const struct timeval [2]);
484 int lutimes(const char *, const struct timeval *);
485 int settimeofday(const struct timeval *, const struct timezone *);
489 int getitimer(int, struct itimerval *);
490 int gettimeofday(struct timeval *, struct timezone *);
495 #endif /* !_KERNEL */
497 #endif /* !_SYS_TIME_H_ */