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88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/* xtime -- extended-resolution integer time stamps
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Copyright (C) 2005 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Written by Paul Eggert. */
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#ifndef XTIME_H_
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#define XTIME_H_ 1
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/* xtime_t is a signed type used for time stamps. It is an integer
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type that is a count of nanoseconds -- except for obsolescent hosts
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without sufficiently-wide integers, where it is a count of
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seconds. */
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#if HAVE_LONG_LONG
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typedef long long int xtime_t;
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# define XTIME_PRECISION 1000000000LL
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#else
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# include <limits.h>
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typedef long int xtime_t;
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# if LONG_MAX >> 31 >> 31 == 0
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# define XTIME_PRECISION 1L
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# else
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# define XTIME_PRECISION 1000000000L
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# endif
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#endif
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/* Return an extended time value that contains S seconds and NS
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nanoseconds, without any overflow checking. */
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static inline xtime_t
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xtime_make (xtime_t s, int ns)
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{
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if (XTIME_PRECISION == 1)
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return s;
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else
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return XTIME_PRECISION * s + ns;
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}
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/* Return the number of seconds in T, which must be nonnegative. */
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static inline xtime_t
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xtime_nonnegative_sec (xtime_t t)
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{
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return t / XTIME_PRECISION;
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}
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/* Return the number of seconds in T. */
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static inline xtime_t
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xtime_sec (xtime_t t)
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{
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return (XTIME_PRECISION == 1
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? t
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: t < 0
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? (t + XTIME_PRECISION - 1) / XTIME_PRECISION - 1
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: xtime_nonnegative_sec (t));
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}
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/* Return the number of nanoseconds in T, which must be nonnegative. */
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static inline int
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xtime_nonnegative_nsec (xtime_t t)
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{
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return t % XTIME_PRECISION;
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}
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/* Return the number of nanoseconds in T. */
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static inline int
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xtime_nsec (xtime_t t)
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{
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int ns = t % XTIME_PRECISION;
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if (ns < 0)
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ns += XTIME_PRECISION;
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return ns;
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}
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#endif
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