From 8ffec2a3aba6f114784e11f89ef1d57a096ae540 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 19:39:29 +0200 Subject: Adding upstream version 8.32. Signed-off-by: Daniel Baumann --- lib/gethrxtime.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 lib/gethrxtime.c (limited to 'lib/gethrxtime.c') diff --git a/lib/gethrxtime.c b/lib/gethrxtime.c new file mode 100644 index 0000000..6a7dc19 --- /dev/null +++ b/lib/gethrxtime.c @@ -0,0 +1,73 @@ +/* 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 . */ + +/* Written by Paul Eggert. */ + +#include + +#define GETHRXTIME_INLINE _GL_EXTERN_INLINE +#include "gethrxtime.h" + +#if ! (HAVE_ARITHMETIC_HRTIME_T && HAVE_DECL_GETHRTIME) + +#include +#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 -- cgit v1.2.3