128 lines
4.4 KiB
C
128 lines
4.4 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 2005,2008 Oracle. All rights reserved.
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*
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* $Id: clock.h 63573 2008-05-23 21:43:21Z trent.nelson $
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*/
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/*
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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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* 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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* FreeBSD: src/sys/sys/time.h,v 1.65 2004/04/07 04:19:49 imp Exp
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*/
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#ifndef _DB_CLOCK_H_
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#define _DB_CLOCK_H_
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/*
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* This declaration is POSIX-compatible. Because there are lots of different
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* time.h include file patterns out there, it's easier to declare our own name
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* in all cases than to try and discover if a system has a struct timespec.
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* For the same reason, and because we'd have to #include <sys/time.h> in db.h,
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* we don't export any timespec structures in the DB API, even in places where
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* it would make sense, like the replication statistics information.
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*/
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typedef struct {
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time_t tv_sec; /* seconds */
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long tv_nsec; /* nanoseconds */
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} db_timespec;
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/* Operations on timespecs */
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#undef timespecclear
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#define timespecclear(tvp) ((tvp)->tv_sec = (tvp)->tv_nsec = 0)
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#undef timespecisset
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#define timespecisset(tvp) ((tvp)->tv_sec || (tvp)->tv_nsec)
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#undef timespeccmp
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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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#undef timespecadd
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/*
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* Note that using timespecadd to add to yourself (i.e. doubling)
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* must be supported.
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*/
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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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#undef timespecsub
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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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#undef timespecset
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#define timespecset(vvp, sec, nsec) \
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do { \
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(vvp)->tv_sec = (time_t)(sec); \
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(vvp)->tv_nsec = (long)(nsec); \
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} while (0)
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#define DB_TIMEOUT_TO_TIMESPEC(t, vvp) \
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do { \
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(vvp)->tv_sec = (time_t)((t) / 1000000); \
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(vvp)->tv_nsec = (long)(((t) % 1000000) * 1000); \
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} while (0)
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#define DB_TIMESPEC_TO_TIMEOUT(t, vvp, prec) \
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do { \
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t = (u_long)((vvp)->tv_sec * 1000000); \
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t += (u_long)((vvp)->tv_nsec / 1000); \
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/* Add in 1 usec for lost nsec precision if wanted. */ \
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if (prec) \
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t++; \
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} while (0)
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#define TIMESPEC_ADD_DB_TIMEOUT(vvp, t) \
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do { \
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db_timespec __tmp; \
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DB_TIMEOUT_TO_TIMESPEC(t, &__tmp); \
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timespecadd((vvp), &__tmp); \
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} while (0)
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#if defined(__cplusplus)
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}
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#endif
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#endif /* !_DB_CLOCK_H_ */
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