diff options
Diffstat (limited to 'gnulib/lib/gethrxtime.c')
m--------- | gnulib | 0 | ||||
-rw-r--r-- | gnulib/lib/gethrxtime.c | 68 |
2 files changed, 68 insertions, 0 deletions
diff --git a/gnulib b/gnulib deleted file mode 160000 -Subproject 443bc5ffcf7429e557f4a371b0661abe98ddbc1 diff --git a/gnulib/lib/gethrxtime.c b/gnulib/lib/gethrxtime.c new file mode 100644 index 0000000..3886752 --- /dev/null +++ b/gnulib/lib/gethrxtime.c @@ -0,0 +1,68 @@ +/* gethrxtime -- get high resolution real time + + Copyright (C) 2005-2007, 2009-2011 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> + +#include "gethrxtime.h" + +#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 +} |