297 lines
9.6 KiB
C
297 lines
9.6 KiB
C
/*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)time.h 8.5 (Berkeley) 5/4/95
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* $Id: time.h,v 1.30 1998/06/07 08:40:53 phk Exp $
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*/
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#ifndef _SYS_TIME_H_
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#define _SYS_TIME_H_
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#include <sys/types.h>
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/*
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* Structure returned by gettimeofday(2) system call,
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* and used in other calls.
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*/
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struct timeval {
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long tv_sec; /* seconds */
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long tv_usec; /* and microseconds */
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};
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#ifndef _TIMESPEC_DECLARED
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#define _TIMESPEC_DECLARED
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struct timespec {
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time_t tv_sec; /* seconds */
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long tv_nsec; /* and nanoseconds */
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};
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#endif
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#define TIMEVAL_TO_TIMESPEC(tv, ts) { \
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(ts)->tv_sec = (tv)->tv_sec; \
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(ts)->tv_nsec = (tv)->tv_usec * 1000; \
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}
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#define TIMESPEC_TO_TIMEVAL(tv, ts) { \
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(tv)->tv_sec = (ts)->tv_sec; \
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(tv)->tv_usec = (ts)->tv_nsec / 1000; \
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}
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struct timezone {
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int tz_minuteswest; /* minutes west of Greenwich */
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int tz_dsttime; /* type of dst correction */
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};
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#define DST_NONE 0 /* not on dst */
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#define DST_USA 1 /* USA style dst */
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#define DST_AUST 2 /* Australian style dst */
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#define DST_WET 3 /* Western European dst */
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#define DST_MET 4 /* Middle European dst */
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#define DST_EET 5 /* Eastern European dst */
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#define DST_CAN 6 /* Canada */
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/*
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* Structure used to interface to the machine dependent hardware support
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* for timekeeping.
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*
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* A timecounter is a (hard or soft) binary counter which has two properties:
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* * it runs at a fixed, known frequency.
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* * it must not roll over in less than (1 + delta)/HZ seconds. "delta"
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* is expected to be less than 20 msec, but no hard data has been
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* collected on this. 16 bit at 5 MHz (31 msec) is known to work.
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*
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* get_timecount() reads the counter.
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*
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* counter_mask removes unimplemented bits from the count value.
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*
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* frequency is the counter frequency in hz.
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*
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* name is a short mnemonic name for this counter.
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*
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* cost is a measure of how long time it takes to read the counter.
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*
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* adjustment [PPM << 16] which means that the smallest unit of correction
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* you can apply amounts to 481.5 usec/year.
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*
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* scale_micro [2^32 * usec/tick].
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* scale_nano_i [ns/tick].
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* scale_nano_f [(ns/2^32)/tick].
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*
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* offset_count is the contents of the counter which corresponds to the
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* rest of the offset_* values.
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*
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* offset_sec [s].
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* offset_micro [usec].
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* offset_nano [ns/2^32] is misnamed, the real unit is .23283064365...
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* attoseconds (10E-18) and before you ask: yes, they are in fact
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* called attoseconds, it comes from "atten" for 18 in Danish/Swedish.
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*
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* Each timecounter must supply an array of three timecounters, this is needed
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* to guarantee atomicity in the code. Index zero is used to transport
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* modifications, for instance done with sysctl, into the timecounter being
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* used in a safe way. Such changes may be adopted with a delay of up to 1/HZ,
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* index one & two are used alternately for the actual timekeeping.
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*
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* `other' points to the opposite "work" timecounter, ie, in index one it
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* points to index two and vice versa
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*
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* `tweak' points to index zero.
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*
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*/
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struct timecounter;
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typedef unsigned timecounter_get_t __P((struct timecounter *));
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struct timecounter {
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/* These fields must be initialized by the driver. */
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timecounter_get_t *get_timecount;
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unsigned counter_mask;
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u_int32_t frequency;
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char *name;
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void *priv;
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/* These fields will be managed by the generic code. */
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int cost;
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int32_t adjustment;
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u_int32_t scale_micro;
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u_int32_t scale_nano_i;
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u_int32_t scale_nano_f;
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unsigned offset_count;
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u_int32_t offset_sec;
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u_int32_t offset_micro;
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u_int64_t offset_nano;
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struct timeval microtime;
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struct timespec nanotime;
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struct timecounter *other;
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struct timecounter *tweak;
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};
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#ifdef KERNEL
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/* Operations on timespecs */
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#define timespecclear(tvp) ((tvp)->tv_sec = (tvp)->tv_nsec = 0)
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#define timespecisset(tvp) ((tvp)->tv_sec || (tvp)->tv_nsec)
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#define timespeccmp(tvp, uvp, cmp) \
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(((tvp)->tv_sec == (uvp)->tv_sec) ? \
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((tvp)->tv_nsec cmp (uvp)->tv_nsec) : \
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((tvp)->tv_sec cmp (uvp)->tv_sec))
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#define timespecadd(vvp, uvp) \
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do { \
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(vvp)->tv_sec += (uvp)->tv_sec; \
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(vvp)->tv_nsec += (uvp)->tv_nsec; \
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if ((vvp)->tv_nsec >= 1000000000) { \
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(vvp)->tv_sec++; \
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(vvp)->tv_nsec -= 1000000000; \
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} \
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} while (0)
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#define timespecsub(vvp, uvp) \
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do { \
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(vvp)->tv_sec -= (uvp)->tv_sec; \
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(vvp)->tv_nsec -= (uvp)->tv_nsec; \
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if ((vvp)->tv_nsec < 0) { \
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(vvp)->tv_sec--; \
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(vvp)->tv_nsec += 1000000000; \
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} \
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} while (0)
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/* Operations on timevals. */
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#define timevalclear(tvp) (tvp)->tv_sec = (tvp)->tv_usec = 0
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#define timevalisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
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#define timevalcmp(tvp, uvp, cmp) \
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(((tvp)->tv_sec == (uvp)->tv_sec) ? \
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((tvp)->tv_usec cmp (uvp)->tv_usec) : \
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((tvp)->tv_sec cmp (uvp)->tv_sec))
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/* timevaladd and timevalsub are not inlined */
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#endif /* KERNEL */
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#ifndef KERNEL /* NetBSD/OpenBSD compatable interfaces */
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#define timerclear(tvp) (tvp)->tv_sec = (tvp)->tv_usec = 0
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#define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
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#define timercmp(tvp, uvp, cmp) \
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(((tvp)->tv_sec == (uvp)->tv_sec) ? \
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((tvp)->tv_usec cmp (uvp)->tv_usec) : \
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((tvp)->tv_sec cmp (uvp)->tv_sec))
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#define timeradd(tvp, uvp, vvp) \
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do { \
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(vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec; \
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(vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
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if ((vvp)->tv_usec >= 1000000) { \
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(vvp)->tv_sec++; \
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(vvp)->tv_usec -= 1000000; \
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} \
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} while (0)
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#define timersub(tvp, uvp, vvp) \
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do { \
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(vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
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(vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
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if ((vvp)->tv_usec < 0) { \
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(vvp)->tv_sec--; \
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(vvp)->tv_usec += 1000000; \
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} \
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} while (0)
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#endif
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/*
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* Names of the interval timers, and structure
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* defining a timer setting.
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*/
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#define ITIMER_REAL 0
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#define ITIMER_VIRTUAL 1
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#define ITIMER_PROF 2
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struct itimerval {
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struct timeval it_interval; /* timer interval */
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struct timeval it_value; /* current value */
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};
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/*
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* Getkerninfo clock information structure
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*/
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struct clockinfo {
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int hz; /* clock frequency */
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int tick; /* micro-seconds per hz tick */
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int tickadj; /* clock skew rate for adjtime() */
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int stathz; /* statistics clock frequency */
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int profhz; /* profiling clock frequency */
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};
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/* CLOCK_REALTIME and TIMER_ABSTIME are supposed to be in time.h */
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#ifndef CLOCK_REALTIME
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#define CLOCK_REALTIME 0
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#endif
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#define CLOCK_VIRTUAL 1
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#define CLOCK_PROF 2
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#define TIMER_RELTIME 0x0 /* relative timer */
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#ifndef TIMER_ABSTIME
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#define TIMER_ABSTIME 0x1 /* absolute timer */
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#endif
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#ifdef KERNEL
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extern struct timecounter *timecounter;
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extern time_t time_second;
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void getmicrouptime __P((struct timeval *tv));
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void getmicrotime __P((struct timeval *tv));
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void getnanouptime __P((struct timespec *tv));
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void getnanotime __P((struct timespec *tv));
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void init_timecounter __P((struct timecounter *tc));
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int itimerdecr __P((struct itimerval *itp, int usec));
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int itimerfix __P((struct timeval *tv));
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void microuptime __P((struct timeval *tv));
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void microtime __P((struct timeval *tv));
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void nanouptime __P((struct timespec *ts));
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void nanotime __P((struct timespec *ts));
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void set_timecounter __P((struct timespec *ts));
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void timevaladd __P((struct timeval *, struct timeval *));
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void timevalsub __P((struct timeval *, struct timeval *));
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int tvtohz __P((struct timeval *));
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#else /* !KERNEL */
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#include <time.h>
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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int adjtime __P((const struct timeval *, struct timeval *));
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int getitimer __P((int, struct itimerval *));
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int gettimeofday __P((struct timeval *, struct timezone *));
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int setitimer __P((int, const struct itimerval *, struct itimerval *));
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int settimeofday __P((const struct timeval *, const struct timezone *));
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int utimes __P((const char *, const struct timeval *));
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__END_DECLS
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#endif /* !KERNEL */
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#endif /* !_SYS_TIME_H_ */
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