74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
|
/* gethrxtime -- get high resolution real time
|
||
|
|
|
||
|
|
Copyright (C) 2005-2007, 2009-2020 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 <https://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
/* Written by Paul Eggert. */
|
||
|
|
|
||
|
|
#include <config.h>
|
||
|
|
|
||
|
|
#define GETHRXTIME_INLINE _GL_EXTERN_INLINE
|
||
|
|
#include "gethrxtime.h"
|
||
|
|
|
||
|
|
#if ! (HAVE_ARITHMETIC_HRTIME_T && HAVE_DECL_GETHRTIME)
|
||
|
|
|
||
|
|
#include <sys/time.h>
|
||
|
|
#include "timespec.h"
|
||
|
|
|
||
|
|
/* Get the current time, as a count of the number of nanoseconds since
|
||
|
|
an arbitrary epoch (e.g., the system boot time). Prefer a
|
||
|
|
high-resolution clock that is not subject to resetting or
|
||
|
|
drifting. */
|
||
|
|
|
||
|
|
xtime_t
|
||
|
|
gethrxtime (void)
|
||
|
|
{
|
||
|
|
# if HAVE_NANOUPTIME
|
||
|
|
{
|
||
|
|
struct timespec ts;
|
||
|
|
nanouptime (&ts);
|
||
|
|
return xtime_make (ts.tv_sec, ts.tv_nsec);
|
||
|
|
}
|
||
|
|
# else
|
||
|
|
|
||
|
|
# if defined CLOCK_MONOTONIC && HAVE_CLOCK_GETTIME
|
||
|
|
{
|
||
|
|
struct timespec ts;
|
||
|
|
if (clock_gettime (CLOCK_MONOTONIC, &ts) == 0)
|
||
|
|
return xtime_make (ts.tv_sec, ts.tv_nsec);
|
||
|
|
}
|
||
|
|
# endif
|
||
|
|
|
||
|
|
# if HAVE_MICROUPTIME
|
||
|
|
{
|
||
|
|
struct timeval tv;
|
||
|
|
microuptime (&tv);
|
||
|
|
return xtime_make (tv.tv_sec, 1000 * tv.tv_usec);
|
||
|
|
}
|
||
|
|
|
||
|
|
# else
|
||
|
|
/* No monotonically increasing clocks are available; fall back on a
|
||
|
|
clock that might jump backwards, since it's the best we can do. */
|
||
|
|
{
|
||
|
|
struct timespec ts;
|
||
|
|
gettime (&ts);
|
||
|
|
return xtime_make (ts.tv_sec, ts.tv_nsec);
|
||
|
|
}
|
||
|
|
# endif
|
||
|
|
# endif
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|