The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/time.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)time.h      8.5 (Berkeley) 5/4/95
   32  * $FreeBSD: stable/12/sys/sys/time.h 336914 2018-07-30 15:46:40Z asomers $
   33  */
   34 
   35 #ifndef _SYS_TIME_H_
   36 #define _SYS_TIME_H_
   37 
   38 #include <sys/_timeval.h>
   39 #include <sys/types.h>
   40 #include <sys/timespec.h>
   41 
   42 struct timezone {
   43         int     tz_minuteswest; /* minutes west of Greenwich */
   44         int     tz_dsttime;     /* type of dst correction */
   45 };
   46 #define DST_NONE        0       /* not on dst */
   47 #define DST_USA         1       /* USA style dst */
   48 #define DST_AUST        2       /* Australian style dst */
   49 #define DST_WET         3       /* Western European dst */
   50 #define DST_MET         4       /* Middle European dst */
   51 #define DST_EET         5       /* Eastern European dst */
   52 #define DST_CAN         6       /* Canada */
   53 
   54 #if __BSD_VISIBLE
   55 struct bintime {
   56         time_t  sec;
   57         uint64_t frac;
   58 };
   59 
   60 static __inline void
   61 bintime_addx(struct bintime *_bt, uint64_t _x)
   62 {
   63         uint64_t _u;
   64 
   65         _u = _bt->frac;
   66         _bt->frac += _x;
   67         if (_u > _bt->frac)
   68                 _bt->sec++;
   69 }
   70 
   71 static __inline void
   72 bintime_add(struct bintime *_bt, const struct bintime *_bt2)
   73 {
   74         uint64_t _u;
   75 
   76         _u = _bt->frac;
   77         _bt->frac += _bt2->frac;
   78         if (_u > _bt->frac)
   79                 _bt->sec++;
   80         _bt->sec += _bt2->sec;
   81 }
   82 
   83 static __inline void
   84 bintime_sub(struct bintime *_bt, const struct bintime *_bt2)
   85 {
   86         uint64_t _u;
   87 
   88         _u = _bt->frac;
   89         _bt->frac -= _bt2->frac;
   90         if (_u < _bt->frac)
   91                 _bt->sec--;
   92         _bt->sec -= _bt2->sec;
   93 }
   94 
   95 static __inline void
   96 bintime_mul(struct bintime *_bt, u_int _x)
   97 {
   98         uint64_t _p1, _p2;
   99 
  100         _p1 = (_bt->frac & 0xffffffffull) * _x;
  101         _p2 = (_bt->frac >> 32) * _x + (_p1 >> 32);
  102         _bt->sec *= _x;
  103         _bt->sec += (_p2 >> 32);
  104         _bt->frac = (_p2 << 32) | (_p1 & 0xffffffffull);
  105 }
  106 
  107 static __inline void
  108 bintime_shift(struct bintime *_bt, int _exp)
  109 {
  110 
  111         if (_exp > 0) {
  112                 _bt->sec <<= _exp;
  113                 _bt->sec |= _bt->frac >> (64 - _exp);
  114                 _bt->frac <<= _exp;
  115         } else if (_exp < 0) {
  116                 _bt->frac >>= -_exp;
  117                 _bt->frac |= (uint64_t)_bt->sec << (64 + _exp);
  118                 _bt->sec >>= -_exp;
  119         }
  120 }
  121 
  122 #define bintime_clear(a)        ((a)->sec = (a)->frac = 0)
  123 #define bintime_isset(a)        ((a)->sec || (a)->frac)
  124 #define bintime_cmp(a, b, cmp)                                          \
  125         (((a)->sec == (b)->sec) ?                                       \
  126             ((a)->frac cmp (b)->frac) :                                 \
  127             ((a)->sec cmp (b)->sec))
  128 
  129 #define SBT_1S  ((sbintime_t)1 << 32)
  130 #define SBT_1M  (SBT_1S * 60)
  131 #define SBT_1MS (SBT_1S / 1000)
  132 #define SBT_1US (SBT_1S / 1000000)
  133 #define SBT_1NS (SBT_1S / 1000000000) /* beware rounding, see nstosbt() */
  134 #define SBT_MAX 0x7fffffffffffffffLL
  135 
  136 static __inline int
  137 sbintime_getsec(sbintime_t _sbt)
  138 {
  139 
  140         return (_sbt >> 32);
  141 }
  142 
  143 static __inline sbintime_t
  144 bttosbt(const struct bintime _bt)
  145 {
  146 
  147         return (((sbintime_t)_bt.sec << 32) + (_bt.frac >> 32));
  148 }
  149 
  150 static __inline struct bintime
  151 sbttobt(sbintime_t _sbt)
  152 {
  153         struct bintime _bt;
  154 
  155         _bt.sec = _sbt >> 32;
  156         _bt.frac = _sbt << 32;
  157         return (_bt);
  158 }
  159 
  160 /*
  161  * Decimal<->sbt conversions.  Multiplying or dividing by SBT_1NS results in
  162  * large roundoff errors which sbttons() and nstosbt() avoid.  Millisecond and
  163  * microsecond functions are also provided for completeness.
  164  */
  165 static __inline int64_t
  166 sbttons(sbintime_t _sbt)
  167 {
  168 
  169         return ((1000000000 * _sbt) >> 32);
  170 }
  171 
  172 static __inline sbintime_t
  173 nstosbt(int64_t _ns)
  174 {
  175 
  176         return ((_ns * (((uint64_t)1 << 63) / 500000000)) >> 32);
  177 }
  178 
  179 static __inline int64_t
  180 sbttous(sbintime_t _sbt)
  181 {
  182 
  183         return ((1000000 * _sbt) >> 32);
  184 }
  185 
  186 static __inline sbintime_t
  187 ustosbt(int64_t _us)
  188 {
  189 
  190         return ((_us * (((uint64_t)1 << 63) / 500000)) >> 32);
  191 }
  192 
  193 static __inline int64_t
  194 sbttoms(sbintime_t _sbt)
  195 {
  196 
  197         return ((1000 * _sbt) >> 32);
  198 }
  199 
  200 static __inline sbintime_t
  201 mstosbt(int64_t _ms)
  202 {
  203 
  204         return ((_ms * (((uint64_t)1 << 63) / 500)) >> 32);
  205 }
  206 
  207 /*-
  208  * Background information:
  209  *
  210  * When converting between timestamps on parallel timescales of differing
  211  * resolutions it is historical and scientific practice to round down rather
  212  * than doing 4/5 rounding.
  213  *
  214  *   The date changes at midnight, not at noon.
  215  *
  216  *   Even at 15:59:59.999999999 it's not four'o'clock.
  217  *
  218  *   time_second ticks after N.999999999 not after N.4999999999
  219  */
  220 
  221 static __inline void
  222 bintime2timespec(const struct bintime *_bt, struct timespec *_ts)
  223 {
  224 
  225         _ts->tv_sec = _bt->sec;
  226         _ts->tv_nsec = ((uint64_t)1000000000 *
  227             (uint32_t)(_bt->frac >> 32)) >> 32;
  228 }
  229 
  230 static __inline void
  231 timespec2bintime(const struct timespec *_ts, struct bintime *_bt)
  232 {
  233 
  234         _bt->sec = _ts->tv_sec;
  235         /* 18446744073 = int(2^64 / 1000000000) */
  236         _bt->frac = _ts->tv_nsec * (uint64_t)18446744073LL;
  237 }
  238 
  239 static __inline void
  240 bintime2timeval(const struct bintime *_bt, struct timeval *_tv)
  241 {
  242 
  243         _tv->tv_sec = _bt->sec;
  244         _tv->tv_usec = ((uint64_t)1000000 * (uint32_t)(_bt->frac >> 32)) >> 32;
  245 }
  246 
  247 static __inline void
  248 timeval2bintime(const struct timeval *_tv, struct bintime *_bt)
  249 {
  250 
  251         _bt->sec = _tv->tv_sec;
  252         /* 18446744073709 = int(2^64 / 1000000) */
  253         _bt->frac = _tv->tv_usec * (uint64_t)18446744073709LL;
  254 }
  255 
  256 static __inline struct timespec
  257 sbttots(sbintime_t _sbt)
  258 {
  259         struct timespec _ts;
  260 
  261         _ts.tv_sec = _sbt >> 32;
  262         _ts.tv_nsec = sbttons((uint32_t)_sbt);
  263         return (_ts);
  264 }
  265 
  266 static __inline sbintime_t
  267 tstosbt(struct timespec _ts)
  268 {
  269 
  270         return (((sbintime_t)_ts.tv_sec << 32) + nstosbt(_ts.tv_nsec));
  271 }
  272 
  273 static __inline struct timeval
  274 sbttotv(sbintime_t _sbt)
  275 {
  276         struct timeval _tv;
  277 
  278         _tv.tv_sec = _sbt >> 32;
  279         _tv.tv_usec = sbttous((uint32_t)_sbt);
  280         return (_tv);
  281 }
  282 
  283 static __inline sbintime_t
  284 tvtosbt(struct timeval _tv)
  285 {
  286 
  287         return (((sbintime_t)_tv.tv_sec << 32) + ustosbt(_tv.tv_usec));
  288 }
  289 #endif /* __BSD_VISIBLE */
  290 
  291 #ifdef _KERNEL
  292 /*
  293  * Simple macros to convert ticks to milliseconds
  294  * or microseconds and vice-versa. The answer
  295  * will always be at least 1. Note the return
  296  * value is a uint32_t however we step up the
  297  * operations to 64 bit to avoid any overflow/underflow
  298  * problems.
  299  */
  300 #define TICKS_2_MSEC(t) max(1, (uint32_t)(hz == 1000) ? \
  301           (t) : (((uint64_t)(t) * (uint64_t)1000)/(uint64_t)hz))
  302 #define TICKS_2_USEC(t) max(1, (uint32_t)(hz == 1000) ? \
  303           ((t) * 1000) : (((uint64_t)(t) * (uint64_t)1000000)/(uint64_t)hz))
  304 #define MSEC_2_TICKS(m) max(1, (uint32_t)((hz == 1000) ? \
  305           (m) : ((uint64_t)(m) * (uint64_t)hz)/(uint64_t)1000))
  306 #define USEC_2_TICKS(u) max(1, (uint32_t)((hz == 1000) ? \
  307          ((u) / 1000) : ((uint64_t)(u) * (uint64_t)hz)/(uint64_t)1000000))
  308 
  309 #endif
  310 /* Operations on timespecs */
  311 #define timespecclear(tvp)      ((tvp)->tv_sec = (tvp)->tv_nsec = 0)
  312 #define timespecisset(tvp)      ((tvp)->tv_sec || (tvp)->tv_nsec)
  313 #define timespeccmp(tvp, uvp, cmp)                                      \
  314         (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
  315             ((tvp)->tv_nsec cmp (uvp)->tv_nsec) :                       \
  316             ((tvp)->tv_sec cmp (uvp)->tv_sec))
  317 
  318 #define timespecadd(tsp, usp, vsp)                                      \
  319         do {                                                            \
  320                 (vsp)->tv_sec = (tsp)->tv_sec + (usp)->tv_sec;          \
  321                 (vsp)->tv_nsec = (tsp)->tv_nsec + (usp)->tv_nsec;       \
  322                 if ((vsp)->tv_nsec >= 1000000000L) {                    \
  323                         (vsp)->tv_sec++;                                \
  324                         (vsp)->tv_nsec -= 1000000000L;                  \
  325                 }                                                       \
  326         } while (0)
  327 #define timespecsub(tsp, usp, vsp)                                      \
  328         do {                                                            \
  329                 (vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec;          \
  330                 (vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec;       \
  331                 if ((vsp)->tv_nsec < 0) {                               \
  332                         (vsp)->tv_sec--;                                \
  333                         (vsp)->tv_nsec += 1000000000L;                  \
  334                 }                                                       \
  335         } while (0)
  336 
  337 #ifdef _KERNEL
  338 
  339 /* Operations on timevals. */
  340 
  341 #define timevalclear(tvp)               ((tvp)->tv_sec = (tvp)->tv_usec = 0)
  342 #define timevalisset(tvp)               ((tvp)->tv_sec || (tvp)->tv_usec)
  343 #define timevalcmp(tvp, uvp, cmp)                                       \
  344         (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
  345             ((tvp)->tv_usec cmp (uvp)->tv_usec) :                       \
  346             ((tvp)->tv_sec cmp (uvp)->tv_sec))
  347 
  348 /* timevaladd and timevalsub are not inlined */
  349 
  350 #endif /* _KERNEL */
  351 
  352 #ifndef _KERNEL                 /* NetBSD/OpenBSD compatible interfaces */
  353 
  354 #define timerclear(tvp)         ((tvp)->tv_sec = (tvp)->tv_usec = 0)
  355 #define timerisset(tvp)         ((tvp)->tv_sec || (tvp)->tv_usec)
  356 #define timercmp(tvp, uvp, cmp)                                 \
  357         (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
  358             ((tvp)->tv_usec cmp (uvp)->tv_usec) :                       \
  359             ((tvp)->tv_sec cmp (uvp)->tv_sec))
  360 #define timeradd(tvp, uvp, vvp)                                         \
  361         do {                                                            \
  362                 (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec;          \
  363                 (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec;       \
  364                 if ((vvp)->tv_usec >= 1000000) {                        \
  365                         (vvp)->tv_sec++;                                \
  366                         (vvp)->tv_usec -= 1000000;                      \
  367                 }                                                       \
  368         } while (0)
  369 #define timersub(tvp, uvp, vvp)                                         \
  370         do {                                                            \
  371                 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;          \
  372                 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;       \
  373                 if ((vvp)->tv_usec < 0) {                               \
  374                         (vvp)->tv_sec--;                                \
  375                         (vvp)->tv_usec += 1000000;                      \
  376                 }                                                       \
  377         } while (0)
  378 #endif
  379 
  380 /*
  381  * Names of the interval timers, and structure
  382  * defining a timer setting.
  383  */
  384 #define ITIMER_REAL     0
  385 #define ITIMER_VIRTUAL  1
  386 #define ITIMER_PROF     2
  387 
  388 struct itimerval {
  389         struct  timeval it_interval;    /* timer interval */
  390         struct  timeval it_value;       /* current value */
  391 };
  392 
  393 /*
  394  * Getkerninfo clock information structure
  395  */
  396 struct clockinfo {
  397         int     hz;             /* clock frequency */
  398         int     tick;           /* micro-seconds per hz tick */
  399         int     spare;
  400         int     stathz;         /* statistics clock frequency */
  401         int     profhz;         /* profiling clock frequency */
  402 };
  403 
  404 /* These macros are also in time.h. */
  405 #ifndef CLOCK_REALTIME
  406 #define CLOCK_REALTIME  0
  407 #define CLOCK_VIRTUAL   1
  408 #define CLOCK_PROF      2
  409 #define CLOCK_MONOTONIC 4
  410 #define CLOCK_UPTIME    5               /* FreeBSD-specific. */
  411 #define CLOCK_UPTIME_PRECISE    7       /* FreeBSD-specific. */
  412 #define CLOCK_UPTIME_FAST       8       /* FreeBSD-specific. */
  413 #define CLOCK_REALTIME_PRECISE  9       /* FreeBSD-specific. */
  414 #define CLOCK_REALTIME_FAST     10      /* FreeBSD-specific. */
  415 #define CLOCK_MONOTONIC_PRECISE 11      /* FreeBSD-specific. */
  416 #define CLOCK_MONOTONIC_FAST    12      /* FreeBSD-specific. */
  417 #define CLOCK_SECOND    13              /* FreeBSD-specific. */
  418 #define CLOCK_THREAD_CPUTIME_ID 14
  419 #define CLOCK_PROCESS_CPUTIME_ID        15
  420 #endif
  421 
  422 #ifndef TIMER_ABSTIME
  423 #define TIMER_RELTIME   0x0     /* relative timer */
  424 #define TIMER_ABSTIME   0x1     /* absolute timer */
  425 #endif
  426 
  427 #if __BSD_VISIBLE
  428 #define CPUCLOCK_WHICH_PID      0
  429 #define CPUCLOCK_WHICH_TID      1
  430 #endif
  431 
  432 #ifdef _KERNEL
  433 
  434 /*
  435  * Kernel to clock driver interface.
  436  */
  437 void    inittodr(time_t base);
  438 void    resettodr(void);
  439 
  440 extern volatile time_t  time_second;
  441 extern volatile time_t  time_uptime;
  442 extern struct bintime tc_tick_bt;
  443 extern sbintime_t tc_tick_sbt;
  444 extern struct bintime tick_bt;
  445 extern sbintime_t tick_sbt;
  446 extern int tc_precexp;
  447 extern int tc_timepercentage;
  448 extern struct bintime bt_timethreshold;
  449 extern struct bintime bt_tickthreshold;
  450 extern sbintime_t sbt_timethreshold;
  451 extern sbintime_t sbt_tickthreshold;
  452 
  453 extern volatile int rtc_generation;
  454 
  455 /*
  456  * Functions for looking at our clock: [get]{bin,nano,micro}[up]time()
  457  *
  458  * Functions without the "get" prefix returns the best timestamp
  459  * we can produce in the given format.
  460  *
  461  * "bin"   == struct bintime  == seconds + 64 bit fraction of seconds.
  462  * "nano"  == struct timespec == seconds + nanoseconds.
  463  * "micro" == struct timeval  == seconds + microseconds.
  464  *
  465  * Functions containing "up" returns time relative to boot and
  466  * should be used for calculating time intervals.
  467  *
  468  * Functions without "up" returns UTC time.
  469  *
  470  * Functions with the "get" prefix returns a less precise result
  471  * much faster than the functions without "get" prefix and should
  472  * be used where a precision of 1/hz seconds is acceptable or where
  473  * performance is priority. (NB: "precision", _not_ "resolution" !)
  474  */
  475 
  476 void    binuptime(struct bintime *bt);
  477 void    nanouptime(struct timespec *tsp);
  478 void    microuptime(struct timeval *tvp);
  479 
  480 static __inline sbintime_t
  481 sbinuptime(void)
  482 {
  483         struct bintime _bt;
  484 
  485         binuptime(&_bt);
  486         return (bttosbt(_bt));
  487 }
  488 
  489 void    bintime(struct bintime *bt);
  490 void    nanotime(struct timespec *tsp);
  491 void    microtime(struct timeval *tvp);
  492 
  493 void    getbinuptime(struct bintime *bt);
  494 void    getnanouptime(struct timespec *tsp);
  495 void    getmicrouptime(struct timeval *tvp);
  496 
  497 static __inline sbintime_t
  498 getsbinuptime(void)
  499 {
  500         struct bintime _bt;
  501 
  502         getbinuptime(&_bt);
  503         return (bttosbt(_bt));
  504 }
  505 
  506 void    getbintime(struct bintime *bt);
  507 void    getnanotime(struct timespec *tsp);
  508 void    getmicrotime(struct timeval *tvp);
  509 
  510 void    getboottime(struct timeval *boottime);
  511 void    getboottimebin(struct bintime *boottimebin);
  512 
  513 /* Other functions */
  514 int     itimerdecr(struct itimerval *itp, int usec);
  515 int     itimerfix(struct timeval *tv);
  516 int     ppsratecheck(struct timeval *, int *, int);
  517 int     ratecheck(struct timeval *, const struct timeval *);
  518 void    timevaladd(struct timeval *t1, const struct timeval *t2);
  519 void    timevalsub(struct timeval *t1, const struct timeval *t2);
  520 int     tvtohz(struct timeval *tv);
  521 
  522 #define TC_DEFAULTPERC          5
  523 
  524 #define BT2FREQ(bt)                                                     \
  525         (((uint64_t)0x8000000000000000 + ((bt)->frac >> 2)) /           \
  526             ((bt)->frac >> 1))
  527 
  528 #define SBT2FREQ(sbt)   ((SBT_1S + ((sbt) >> 1)) / (sbt))
  529 
  530 #define FREQ2BT(freq, bt)                                               \
  531 {                                                                       \
  532         (bt)->sec = 0;                                                  \
  533         (bt)->frac = ((uint64_t)0x8000000000000000  / (freq)) << 1;     \
  534 }
  535 
  536 #define TIMESEL(sbt, sbt2)                                              \
  537         (((sbt2) >= sbt_timethreshold) ?                                \
  538             ((*(sbt) = getsbinuptime()), 1) : ((*(sbt) = sbinuptime()), 0))
  539 
  540 #else /* !_KERNEL */
  541 #include <time.h>
  542 
  543 #include <sys/cdefs.h>
  544 #include <sys/select.h>
  545 
  546 __BEGIN_DECLS
  547 int     setitimer(int, const struct itimerval *, struct itimerval *);
  548 int     utimes(const char *, const struct timeval *);
  549 
  550 #if __BSD_VISIBLE
  551 int     adjtime(const struct timeval *, struct timeval *);
  552 int     clock_getcpuclockid2(id_t, int, clockid_t *);
  553 int     futimes(int, const struct timeval *);
  554 int     futimesat(int, const char *, const struct timeval [2]);
  555 int     lutimes(const char *, const struct timeval *);
  556 int     settimeofday(const struct timeval *, const struct timezone *);
  557 #endif
  558 
  559 #if __XSI_VISIBLE
  560 int     getitimer(int, struct itimerval *);
  561 int     gettimeofday(struct timeval *, struct timezone *);
  562 #endif
  563 
  564 __END_DECLS
  565 
  566 #endif /* !_KERNEL */
  567 
  568 #endif /* !_SYS_TIME_H_ */

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