Mercurial > gnulib
view lib/gethrxtime.c @ 17249:e542fd46ad6f
maint: update all copyright year number ranges
Run "make update-copyright". Compare to commit 1602f0a from last year.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Tue, 01 Jan 2013 00:50:58 +0000 |
parents | fe213f3f2c57 |
children | 344018b6e5d7 |
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/* gethrxtime -- get high resolution real time Copyright (C) 2005-2007, 2009-2013 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. */ #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