The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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  * Copyright (c) 1982, 1986, 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
    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.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)time.h      8.5 (Berkeley) 5/4/95
   30  * $FreeBSD: releng/10.1/sys/sys/time.h 270240 2014-08-20 18:40:29Z davide $
   31  */
   32 
   33 #ifndef _SYS_TIME_H_
   34 #define _SYS_TIME_H_
   35 
   36 #include <sys/_timeval.h>
   37 #include <sys/types.h>
   38 #include <sys/timespec.h>
   39 
   40 struct timezone {
   41         int     tz_minuteswest; /* minutes west of Greenwich */
   42         int     tz_dsttime;     /* type of dst correction */
   43 };
   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 */
   51 
   52 #if __BSD_VISIBLE
   53 struct bintime {
   54         time_t  sec;
   55         uint64_t frac;
   56 };
   57 
   58 static __inline void
   59 bintime_addx(struct bintime *_bt, uint64_t _x)
   60 {
   61         uint64_t _u;
   62 
   63         _u = _bt->frac;
   64         _bt->frac += _x;
   65         if (_u > _bt->frac)
   66                 _bt->sec++;
   67 }
   68 
   69 static __inline void
   70 bintime_add(struct bintime *_bt, const struct bintime *_bt2)
   71 {
   72         uint64_t _u;
   73 
   74         _u = _bt->frac;
   75         _bt->frac += _bt2->frac;
   76         if (_u > _bt->frac)
   77                 _bt->sec++;
   78         _bt->sec += _bt2->sec;
   79 }
   80 
   81 static __inline void
   82 bintime_sub(struct bintime *_bt, const struct bintime *_bt2)
   83 {
   84         uint64_t _u;
   85 
   86         _u = _bt->frac;
   87         _bt->frac -= _bt2->frac;
   88         if (_u < _bt->frac)
   89                 _bt->sec--;
   90         _bt->sec -= _bt2->sec;
   91 }
   92 
   93 static __inline void
   94 bintime_mul(struct bintime *_bt, u_int _x)
   95 {
   96         uint64_t _p1, _p2;
   97 
   98         _p1 = (_bt->frac & 0xffffffffull) * _x;
   99         _p2 = (_bt->frac >> 32) * _x + (_p1 >> 32);
  100         _bt->sec *= _x;
  101         _bt->sec += (_p2 >> 32);
  102         _bt->frac = (_p2 << 32) | (_p1 & 0xffffffffull);
  103 }
  104 
  105 static __inline void
  106 bintime_shift(struct bintime *_bt, int _exp)
  107 {
  108 
  109         if (_exp > 0) {
  110                 _bt->sec <<= _exp;
  111                 _bt->sec |= _bt->frac >> (64 - _exp);
  112                 _bt->frac <<= _exp;
  113         } else if (_exp < 0) {
  114                 _bt->frac >>= -_exp;
  115                 _bt->frac |= (uint64_t)_bt->sec << (64 + _exp);
  116                 _bt->sec >>= -_exp;
  117         }
  118 }
  119 
  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))
  126 
  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)
  132 #define SBT_MAX 0x7fffffffffffffff
  133 
  134 static __inline int
  135 sbintime_getsec(sbintime_t _sbt)
  136 {
  137 
  138         return (_sbt >> 32);
  139 }
  140 
  141 static __inline sbintime_t
  142 bttosbt(const struct bintime _bt)
  143 {
  144 
  145         return (((sbintime_t)_bt.sec << 32) + (_bt.frac >> 32));
  146 }
  147 
  148 static __inline struct bintime
  149 sbttobt(sbintime_t _sbt)
  150 {
  151         struct bintime _bt;
  152 
  153         _bt.sec = _sbt >> 32;
  154         _bt.frac = _sbt << 32;
  155         return (_bt);
  156 }
  157 
  158 /*-
  159  * Background information:
  160  *
  161  * When converting between timestamps on parallel timescales of differing
  162  * resolutions it is historical and scientific practice to round down rather
  163  * than doing 4/5 rounding.
  164  *
  165  *   The date changes at midnight, not at noon.
  166  *
  167  *   Even at 15:59:59.999999999 it's not four'o'clock.
  168  *
  169  *   time_second ticks after N.999999999 not after N.4999999999
  170  */
  171 
  172 static __inline void
  173 bintime2timespec(const struct bintime *_bt, struct timespec *_ts)
  174 {
  175 
  176         _ts->tv_sec = _bt->sec;
  177         _ts->tv_nsec = ((uint64_t)1000000000 *
  178             (uint32_t)(_bt->frac >> 32)) >> 32;
  179 }
  180 
  181 static __inline void
  182 timespec2bintime(const struct timespec *_ts, struct bintime *_bt)
  183 {
  184 
  185         _bt->sec = _ts->tv_sec;
  186         /* 18446744073 = int(2^64 / 1000000000) */
  187         _bt->frac = _ts->tv_nsec * (uint64_t)18446744073LL;
  188 }
  189 
  190 static __inline void
  191 bintime2timeval(const struct bintime *_bt, struct timeval *_tv)
  192 {
  193 
  194         _tv->tv_sec = _bt->sec;
  195         _tv->tv_usec = ((uint64_t)1000000 * (uint32_t)(_bt->frac >> 32)) >> 32;
  196 }
  197 
  198 static __inline void
  199 timeval2bintime(const struct timeval *_tv, struct bintime *_bt)
  200 {
  201 
  202         _bt->sec = _tv->tv_sec;
  203         /* 18446744073709 = int(2^64 / 1000000) */
  204         _bt->frac = _tv->tv_usec * (uint64_t)18446744073709LL;
  205 }
  206 
  207 static __inline struct timespec
  208 sbttots(sbintime_t _sbt)
  209 {
  210         struct timespec _ts;
  211 
  212         _ts.tv_sec = _sbt >> 32;
  213         _ts.tv_nsec = ((uint64_t)1000000000 * (uint32_t)_sbt) >> 32;
  214         return (_ts);
  215 }
  216 
  217 static __inline sbintime_t
  218 tstosbt(struct timespec _ts)
  219 {
  220 
  221         return (((sbintime_t)_ts.tv_sec << 32) +
  222             (_ts.tv_nsec * (((uint64_t)1 << 63) / 500000000) >> 32));
  223 }
  224 
  225 static __inline struct timeval
  226 sbttotv(sbintime_t _sbt)
  227 {
  228         struct timeval _tv;
  229 
  230         _tv.tv_sec = _sbt >> 32;
  231         _tv.tv_usec = ((uint64_t)1000000 * (uint32_t)_sbt) >> 32;
  232         return (_tv);
  233 }
  234 
  235 static __inline sbintime_t
  236 tvtosbt(struct timeval _tv)
  237 {
  238 
  239         return (((sbintime_t)_tv.tv_sec << 32) +
  240             (_tv.tv_usec * (((uint64_t)1 << 63) / 500000) >> 32));
  241 }
  242 #endif /* __BSD_VISIBLE */
  243 
  244 #ifdef _KERNEL
  245 
  246 /* Operations on timespecs */
  247 #define timespecclear(tvp)      ((tvp)->tv_sec = (tvp)->tv_nsec = 0)
  248 #define timespecisset(tvp)      ((tvp)->tv_sec || (tvp)->tv_nsec)
  249 #define timespeccmp(tvp, uvp, cmp)                                      \
  250         (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
  251             ((tvp)->tv_nsec cmp (uvp)->tv_nsec) :                       \
  252             ((tvp)->tv_sec cmp (uvp)->tv_sec))
  253 #define timespecadd(vvp, uvp)                                           \
  254         do {                                                            \
  255                 (vvp)->tv_sec += (uvp)->tv_sec;                         \
  256                 (vvp)->tv_nsec += (uvp)->tv_nsec;                       \
  257                 if ((vvp)->tv_nsec >= 1000000000) {                     \
  258                         (vvp)->tv_sec++;                                \
  259                         (vvp)->tv_nsec -= 1000000000;                   \
  260                 }                                                       \
  261         } while (0)
  262 #define timespecsub(vvp, uvp)                                           \
  263         do {                                                            \
  264                 (vvp)->tv_sec -= (uvp)->tv_sec;                         \
  265                 (vvp)->tv_nsec -= (uvp)->tv_nsec;                       \
  266                 if ((vvp)->tv_nsec < 0) {                               \
  267                         (vvp)->tv_sec--;                                \
  268                         (vvp)->tv_nsec += 1000000000;                   \
  269                 }                                                       \
  270         } while (0)
  271 
  272 /* Operations on timevals. */
  273 
  274 #define timevalclear(tvp)               ((tvp)->tv_sec = (tvp)->tv_usec = 0)
  275 #define timevalisset(tvp)               ((tvp)->tv_sec || (tvp)->tv_usec)
  276 #define timevalcmp(tvp, uvp, cmp)                                       \
  277         (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
  278             ((tvp)->tv_usec cmp (uvp)->tv_usec) :                       \
  279             ((tvp)->tv_sec cmp (uvp)->tv_sec))
  280 
  281 /* timevaladd and timevalsub are not inlined */
  282 
  283 #endif /* _KERNEL */
  284 
  285 #ifndef _KERNEL                 /* NetBSD/OpenBSD compatible interfaces */
  286 
  287 #define timerclear(tvp)         ((tvp)->tv_sec = (tvp)->tv_usec = 0)
  288 #define timerisset(tvp)         ((tvp)->tv_sec || (tvp)->tv_usec)
  289 #define timercmp(tvp, uvp, cmp)                                 \
  290         (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
  291             ((tvp)->tv_usec cmp (uvp)->tv_usec) :                       \
  292             ((tvp)->tv_sec cmp (uvp)->tv_sec))
  293 #define timeradd(tvp, uvp, vvp)                                         \
  294         do {                                                            \
  295                 (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec;          \
  296                 (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec;       \
  297                 if ((vvp)->tv_usec >= 1000000) {                        \
  298                         (vvp)->tv_sec++;                                \
  299                         (vvp)->tv_usec -= 1000000;                      \
  300                 }                                                       \
  301         } while (0)
  302 #define timersub(tvp, uvp, vvp)                                         \
  303         do {                                                            \
  304                 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;          \
  305                 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;       \
  306                 if ((vvp)->tv_usec < 0) {                               \
  307                         (vvp)->tv_sec--;                                \
  308                         (vvp)->tv_usec += 1000000;                      \
  309                 }                                                       \
  310         } while (0)
  311 #endif
  312 
  313 /*
  314  * Names of the interval timers, and structure
  315  * defining a timer setting.
  316  */
  317 #define ITIMER_REAL     0
  318 #define ITIMER_VIRTUAL  1
  319 #define ITIMER_PROF     2
  320 
  321 struct itimerval {
  322         struct  timeval it_interval;    /* timer interval */
  323         struct  timeval it_value;       /* current value */
  324 };
  325 
  326 /*
  327  * Getkerninfo clock information structure
  328  */
  329 struct clockinfo {
  330         int     hz;             /* clock frequency */
  331         int     tick;           /* micro-seconds per hz tick */
  332         int     spare;
  333         int     stathz;         /* statistics clock frequency */
  334         int     profhz;         /* profiling clock frequency */
  335 };
  336 
  337 /* These macros are also in time.h. */
  338 #ifndef CLOCK_REALTIME
  339 #define CLOCK_REALTIME  0
  340 #define CLOCK_VIRTUAL   1
  341 #define CLOCK_PROF      2
  342 #define CLOCK_MONOTONIC 4
  343 #define CLOCK_UPTIME    5               /* FreeBSD-specific. */
  344 #define CLOCK_UPTIME_PRECISE    7       /* FreeBSD-specific. */
  345 #define CLOCK_UPTIME_FAST       8       /* FreeBSD-specific. */
  346 #define CLOCK_REALTIME_PRECISE  9       /* FreeBSD-specific. */
  347 #define CLOCK_REALTIME_FAST     10      /* FreeBSD-specific. */
  348 #define CLOCK_MONOTONIC_PRECISE 11      /* FreeBSD-specific. */
  349 #define CLOCK_MONOTONIC_FAST    12      /* FreeBSD-specific. */
  350 #define CLOCK_SECOND    13              /* FreeBSD-specific. */
  351 #define CLOCK_THREAD_CPUTIME_ID 14
  352 #define CLOCK_PROCESS_CPUTIME_ID        15
  353 #endif
  354 
  355 #ifndef TIMER_ABSTIME
  356 #define TIMER_RELTIME   0x0     /* relative timer */
  357 #define TIMER_ABSTIME   0x1     /* absolute timer */
  358 #endif
  359 
  360 #if __BSD_VISIBLE
  361 #define CPUCLOCK_WHICH_PID      0
  362 #define CPUCLOCK_WHICH_TID      1
  363 #endif
  364 
  365 #ifdef _KERNEL
  366 
  367 /*
  368  * Kernel to clock driver interface.
  369  */
  370 void    inittodr(time_t base);
  371 void    resettodr(void);
  372 
  373 extern volatile time_t  time_second;
  374 extern volatile time_t  time_uptime;
  375 extern struct bintime boottimebin;
  376 extern struct timeval boottime;
  377 extern struct bintime tc_tick_bt;
  378 extern sbintime_t tc_tick_sbt;
  379 extern struct bintime tick_bt;
  380 extern sbintime_t tick_sbt;
  381 extern int tc_precexp;
  382 extern int tc_timepercentage;
  383 extern struct bintime bt_timethreshold;
  384 extern struct bintime bt_tickthreshold;
  385 extern sbintime_t sbt_timethreshold;
  386 extern sbintime_t sbt_tickthreshold;
  387 
  388 /*
  389  * Functions for looking at our clock: [get]{bin,nano,micro}[up]time()
  390  *
  391  * Functions without the "get" prefix returns the best timestamp
  392  * we can produce in the given format.
  393  *
  394  * "bin"   == struct bintime  == seconds + 64 bit fraction of seconds.
  395  * "nano"  == struct timespec == seconds + nanoseconds.
  396  * "micro" == struct timeval  == seconds + microseconds.
  397  *
  398  * Functions containing "up" returns time relative to boot and
  399  * should be used for calculating time intervals.
  400  *
  401  * Functions without "up" returns GMT time.
  402  *
  403  * Functions with the "get" prefix returns a less precise result
  404  * much faster than the functions without "get" prefix and should
  405  * be used where a precision of 1/hz seconds is acceptable or where
  406  * performance is priority. (NB: "precision", _not_ "resolution" !)
  407  */
  408 
  409 void    binuptime(struct bintime *bt);
  410 void    nanouptime(struct timespec *tsp);
  411 void    microuptime(struct timeval *tvp);
  412 
  413 static __inline sbintime_t
  414 sbinuptime(void)
  415 {
  416         struct bintime _bt;
  417 
  418         binuptime(&_bt);
  419         return (bttosbt(_bt));
  420 }
  421 
  422 void    bintime(struct bintime *bt);
  423 void    nanotime(struct timespec *tsp);
  424 void    microtime(struct timeval *tvp);
  425 
  426 void    getbinuptime(struct bintime *bt);
  427 void    getnanouptime(struct timespec *tsp);
  428 void    getmicrouptime(struct timeval *tvp);
  429 
  430 static __inline sbintime_t
  431 getsbinuptime(void)
  432 {
  433         struct bintime _bt;
  434 
  435         getbinuptime(&_bt);
  436         return (bttosbt(_bt));
  437 }
  438 
  439 void    getbintime(struct bintime *bt);
  440 void    getnanotime(struct timespec *tsp);
  441 void    getmicrotime(struct timeval *tvp);
  442 
  443 /* Other functions */
  444 int     itimerdecr(struct itimerval *itp, int usec);
  445 int     itimerfix(struct timeval *tv);
  446 int     ppsratecheck(struct timeval *, int *, int);
  447 int     ratecheck(struct timeval *, const struct timeval *);
  448 void    timevaladd(struct timeval *t1, const struct timeval *t2);
  449 void    timevalsub(struct timeval *t1, const struct timeval *t2);
  450 int     tvtohz(struct timeval *tv);
  451 
  452 #define TC_DEFAULTPERC          5
  453 
  454 #define BT2FREQ(bt)                                                     \
  455         (((uint64_t)0x8000000000000000 + ((bt)->frac >> 2)) /           \
  456             ((bt)->frac >> 1))
  457 
  458 #define SBT2FREQ(sbt)   ((SBT_1S + ((sbt) >> 1)) / (sbt))
  459 
  460 #define FREQ2BT(freq, bt)                                               \
  461 {                                                                       \
  462         (bt)->sec = 0;                                                  \
  463         (bt)->frac = ((uint64_t)0x8000000000000000  / (freq)) << 1;     \
  464 }
  465 
  466 #define TIMESEL(sbt, sbt2)                                              \
  467         (((sbt2) >= sbt_timethreshold) ?                                \
  468             ((*(sbt) = getsbinuptime()), 1) : ((*(sbt) = sbinuptime()), 0))
  469 
  470 #else /* !_KERNEL */
  471 #include <time.h>
  472 
  473 #include <sys/cdefs.h>
  474 #include <sys/select.h>
  475 
  476 __BEGIN_DECLS
  477 int     setitimer(int, const struct itimerval *, struct itimerval *);
  478 int     utimes(const char *, const struct timeval *);
  479 
  480 #if __BSD_VISIBLE
  481 int     adjtime(const struct timeval *, struct timeval *);
  482 int     clock_getcpuclockid2(id_t, int, clockid_t *);
  483 int     futimes(int, const struct timeval *);
  484 int     futimesat(int, const char *, const struct timeval [2]);
  485 int     lutimes(const char *, const struct timeval *);
  486 int     settimeofday(const struct timeval *, const struct timezone *);
  487 #endif
  488 
  489 #if __XSI_VISIBLE
  490 int     getitimer(int, struct itimerval *);
  491 int     gettimeofday(struct timeval *, struct timezone *);
  492 #endif
  493 
  494 __END_DECLS
  495 
  496 #endif /* !_KERNEL */
  497 
  498 #endif /* !_SYS_TIME_H_ */

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