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Import the gethrxtime module from gnulib.

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gnulib 9e117ae955a5c6a0406140e62b76c3ef50e3bc2b.

* lib/gethrxtime.c, lib/gethrxtime.h, lib/gettime.c, lib/timespec.c,
lib/timespec.h, lib/xtime.h, m4/clock_time.m4, m4/gethrxtime.m4,
m4/gettime.m4, m4/timespec.m4: New files.
* m4/gnulib-cache.m4, m4/gnulib-comp.m4, lib/Makefile.am: Adjust.
This commit is contained in:
Alexandre Duret-Lutz 2012-10-08 21:59:59 +02:00
parent d7e8684d38
commit 756319739b
13 changed files with 510 additions and 2 deletions
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86
lib/xtime.h Normal file
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/* xtime -- extended-resolution integer time stamps
Copyright (C) 2005-2006, 2009-2012 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Paul Eggert. */
#ifndef XTIME_H_
# define XTIME_H_ 1
/* xtime_t is a signed type used for time stamps. It is an integer
type that is a count of nanoseconds -- except for obsolescent hosts
without sufficiently-wide integers, where it is a count of
seconds. */
# if HAVE_LONG_LONG_INT
typedef long long int xtime_t;
# define XTIME_PRECISION 1000000000
# else
# include <limits.h>
typedef long int xtime_t;
# if LONG_MAX >> 31 >> 31 == 0
# define XTIME_PRECISION 1
# else
# define XTIME_PRECISION 1000000000
# endif
# endif
/* Return an extended time value that contains S seconds and NS
nanoseconds, without any overflow checking. */
static inline xtime_t
xtime_make (xtime_t s, long int ns)
{
if (XTIME_PRECISION == 1)
return s;
else
return XTIME_PRECISION * s + ns;
}
/* Return the number of seconds in T, which must be nonnegative. */
static inline xtime_t
xtime_nonnegative_sec (xtime_t t)
{
return t / XTIME_PRECISION;
}
/* Return the number of seconds in T. */
static inline xtime_t
xtime_sec (xtime_t t)
{
return (XTIME_PRECISION == 1
? t
: t < 0
? (t + XTIME_PRECISION - 1) / XTIME_PRECISION - 1
: xtime_nonnegative_sec (t));
}
/* Return the number of nanoseconds in T, which must be nonnegative. */
static inline long int
xtime_nonnegative_nsec (xtime_t t)
{
return t % XTIME_PRECISION;
}
/* Return the number of nanoseconds in T. */
static inline long int
xtime_nsec (xtime_t t)
{
long int ns = t % XTIME_PRECISION;
if (ns < 0)
ns += XTIME_PRECISION;
return ns;
}
#endif