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/10.0/sys/sys/time.h 255135 2013-09-01 22:30:24Z 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 
  133 static __inline int
  134 sbintime_getsec(sbintime_t _sbt)
  135 {
  136 
  137         return (_sbt >> 32);
  138 }
  139 
  140 static __inline sbintime_t
  141 bttosbt(const struct bintime _bt)
  142 {
  143 
  144         return (((sbintime_t)_bt.sec << 32) + (_bt.frac >> 32));
  145 }
  146 
  147 static __inline struct bintime
  148 sbttobt(sbintime_t _sbt)
  149 {
  150         struct bintime _bt;
  151 
  152         _bt.sec = _sbt >> 32;
  153         _bt.frac = _sbt << 32;
  154         return (_bt);
  155 }
  156 
  157 /*-
  158  * Background information:
  159  *
  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.
  163  *
  164  *   The date changes at midnight, not at noon.
  165  *
  166  *   Even at 15:59:59.999999999 it's not four'o'clock.
  167  *
  168  *   time_second ticks after N.999999999 not after N.4999999999
  169  */
  170 
  171 static __inline void
  172 bintime2timespec(const struct bintime *_bt, struct timespec *_ts)
  173 {
  174 
  175         _ts->tv_sec = _bt->sec;
  176         _ts->tv_nsec = ((uint64_t)1000000000 *
  177             (uint32_t)(_bt->frac >> 32)) >> 32;
  178 }
  179 
  180 static __inline void
  181 timespec2bintime(const struct timespec *_ts, struct bintime *_bt)
  182 {
  183 
  184         _bt->sec = _ts->tv_sec;
  185         /* 18446744073 = int(2^64 / 1000000000) */
  186         _bt->frac = _ts->tv_nsec * (uint64_t)18446744073LL;
  187 }
  188 
  189 static __inline void
  190 bintime2timeval(const struct bintime *_bt, struct timeval *_tv)
  191 {
  192 
  193         _tv->tv_sec = _bt->sec;
  194         _tv->tv_usec = ((uint64_t)1000000 * (uint32_t)(_bt->frac >> 32)) >> 32;
  195 }
  196 
  197 static __inline void
  198 timeval2bintime(const struct timeval *_tv, struct bintime *_bt)
  199 {
  200 
  201         _bt->sec = _tv->tv_sec;
  202         /* 18446744073709 = int(2^64 / 1000000) */
  203         _bt->frac = _tv->tv_usec * (uint64_t)18446744073709LL;
  204 }
  205 
  206 static __inline struct timespec
  207 sbttots(sbintime_t _sbt)
  208 {
  209         struct timespec _ts;
  210 
  211         _ts.tv_sec = _sbt >> 32;
  212         _ts.tv_nsec = ((uint64_t)1000000000 * (uint32_t)_sbt) >> 32;
  213         return (_ts);
  214 }
  215 
  216 static __inline sbintime_t
  217 tstosbt(struct timespec _ts)
  218 {
  219 
  220         return (((sbintime_t)_ts.tv_sec << 32) +
  221             (_ts.tv_nsec * (((uint64_t)1 << 63) / 500000000) >> 32));
  222 }
  223 
  224 static __inline struct timeval
  225 sbttotv(sbintime_t _sbt)
  226 {
  227         struct timeval _tv;
  228 
  229         _tv.tv_sec = _sbt >> 32;
  230         _tv.tv_usec = ((uint64_t)1000000 * (uint32_t)_sbt) >> 32;
  231         return (_tv);
  232 }
  233 
  234 static __inline sbintime_t
  235 tvtosbt(struct timeval _tv)
  236 {
  237 
  238         return (((sbintime_t)_tv.tv_sec << 32) +
  239             (_tv.tv_usec * (((uint64_t)1 << 63) / 500000) >> 32));
  240 }
  241 #endif /* __BSD_VISIBLE */
  242 
  243 #ifdef _KERNEL
  244 
  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)                                           \
  253         do {                                                            \
  254                 (vvp)->tv_sec += (uvp)->tv_sec;                         \
  255                 (vvp)->tv_nsec += (uvp)->tv_nsec;                       \
  256                 if ((vvp)->tv_nsec >= 1000000000) {                     \
  257                         (vvp)->tv_sec++;                                \
  258                         (vvp)->tv_nsec -= 1000000000;                   \
  259                 }                                                       \
  260         } while (0)
  261 #define timespecsub(vvp, uvp)                                           \
  262         do {                                                            \
  263                 (vvp)->tv_sec -= (uvp)->tv_sec;                         \
  264                 (vvp)->tv_nsec -= (uvp)->tv_nsec;                       \
  265                 if ((vvp)->tv_nsec < 0) {                               \
  266                         (vvp)->tv_sec--;                                \
  267                         (vvp)->tv_nsec += 1000000000;                   \
  268                 }                                                       \
  269         } while (0)
  270 
  271 /* Operations on timevals. */
  272 
  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))
  279 
  280 /* timevaladd and timevalsub are not inlined */
  281 
  282 #endif /* _KERNEL */
  283 
  284 #ifndef _KERNEL                 /* NetBSD/OpenBSD compatible interfaces */
  285 
  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)                                         \
  293         do {                                                            \
  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) {                        \
  297                         (vvp)->tv_sec++;                                \
  298                         (vvp)->tv_usec -= 1000000;                      \
  299                 }                                                       \
  300         } while (0)
  301 #define timersub(tvp, uvp, vvp)                                         \
  302         do {                                                            \
  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) {                               \
  306                         (vvp)->tv_sec--;                                \
  307                         (vvp)->tv_usec += 1000000;                      \
  308                 }                                                       \
  309         } while (0)
  310 #endif
  311 
  312 /*
  313  * Names of the interval timers, and structure
  314  * defining a timer setting.
  315  */
  316 #define ITIMER_REAL     0
  317 #define ITIMER_VIRTUAL  1
  318 #define ITIMER_PROF     2
  319 
  320 struct itimerval {
  321         struct  timeval it_interval;    /* timer interval */
  322         struct  timeval it_value;       /* current value */
  323 };
  324 
  325 /*
  326  * Getkerninfo clock information structure
  327  */
  328 struct clockinfo {
  329         int     hz;             /* clock frequency */
  330         int     tick;           /* micro-seconds per hz tick */
  331         int     spare;
  332         int     stathz;         /* statistics clock frequency */
  333         int     profhz;         /* profiling clock frequency */
  334 };
  335 
  336 /* These macros are also in time.h. */
  337 #ifndef CLOCK_REALTIME
  338 #define CLOCK_REALTIME  0
  339 #define CLOCK_VIRTUAL   1
  340 #define CLOCK_PROF      2
  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
  352 #endif
  353 
  354 #ifndef TIMER_ABSTIME
  355 #define TIMER_RELTIME   0x0     /* relative timer */
  356 #define TIMER_ABSTIME   0x1     /* absolute timer */
  357 #endif
  358 
  359 #if __BSD_VISIBLE
  360 #define CPUCLOCK_WHICH_PID      0
  361 #define CPUCLOCK_WHICH_TID      1
  362 #endif
  363 
  364 #ifdef _KERNEL
  365 
  366 /*
  367  * Kernel to clock driver interface.
  368  */
  369 void    inittodr(time_t base);
  370 void    resettodr(void);
  371 
  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;
  386 
  387 /*
  388  * Functions for looking at our clock: [get]{bin,nano,micro}[up]time()
  389  *
  390  * Functions without the "get" prefix returns the best timestamp
  391  * we can produce in the given format.
  392  *
  393  * "bin"   == struct bintime  == seconds + 64 bit fraction of seconds.
  394  * "nano"  == struct timespec == seconds + nanoseconds.
  395  * "micro" == struct timeval  == seconds + microseconds.
  396  *
  397  * Functions containing "up" returns time relative to boot and
  398  * should be used for calculating time intervals.
  399  *
  400  * Functions without "up" returns GMT time.
  401  *
  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" !)
  406  */
  407 
  408 void    binuptime(struct bintime *bt);
  409 void    nanouptime(struct timespec *tsp);
  410 void    microuptime(struct timeval *tvp);
  411 
  412 static __inline sbintime_t
  413 sbinuptime(void)
  414 {
  415         struct bintime _bt;
  416 
  417         binuptime(&_bt);
  418         return (bttosbt(_bt));
  419 }
  420 
  421 void    bintime(struct bintime *bt);
  422 void    nanotime(struct timespec *tsp);
  423 void    microtime(struct timeval *tvp);
  424 
  425 void    getbinuptime(struct bintime *bt);
  426 void    getnanouptime(struct timespec *tsp);
  427 void    getmicrouptime(struct timeval *tvp);
  428 
  429 static __inline sbintime_t
  430 getsbinuptime(void)
  431 {
  432         struct bintime _bt;
  433 
  434         getbinuptime(&_bt);
  435         return (bttosbt(_bt));
  436 }
  437 
  438 void    getbintime(struct bintime *bt);
  439 void    getnanotime(struct timespec *tsp);
  440 void    getmicrotime(struct timeval *tvp);
  441 
  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);
  450 
  451 #define TC_DEFAULTPERC          5
  452 
  453 #define BT2FREQ(bt)                                                     \
  454         (((uint64_t)0x8000000000000000 + ((bt)->frac >> 2)) /           \
  455             ((bt)->frac >> 1))
  456 
  457 #define SBT2FREQ(sbt)   ((SBT_1S + ((sbt) >> 1)) / (sbt))
  458 
  459 #define FREQ2BT(freq, bt)                                               \
  460 {                                                                       \
  461         (bt)->sec = 0;                                                  \
  462         (bt)->frac = ((uint64_t)0x8000000000000000  / (freq)) << 1;     \
  463 }
  464 
  465 #define TIMESEL(sbt, sbt2)                                              \
  466         (((sbt2) >= sbt_timethreshold) ?                                \
  467             ((*(sbt) = getsbinuptime()), 1) : ((*(sbt) = sbinuptime()), 0))
  468 
  469 #else /* !_KERNEL */
  470 #include <time.h>
  471 
  472 #include <sys/cdefs.h>
  473 #include <sys/select.h>
  474 
  475 __BEGIN_DECLS
  476 int     setitimer(int, const struct itimerval *, struct itimerval *);
  477 int     utimes(const char *, const struct timeval *);
  478 
  479 #if __BSD_VISIBLE
  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 *);
  486 #endif
  487 
  488 #if __XSI_VISIBLE
  489 int     getitimer(int, struct itimerval *);
  490 int     gettimeofday(struct timeval *, struct timezone *);
  491 #endif
  492 
  493 __END_DECLS
  494 
  495 #endif /* !_KERNEL */
  496 
  497 #endif /* !_SYS_TIME_H_ */

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