Mercurial > gnulib
view lib/xtime.h @ 39916:dbcdcd1db895
timevar: use gethrxtime to get wall clock time
clock_gettime is not portable. gethrxtime takes the best available
option to get the wall clock time, including clock_gettime (monotonic
clock), and gettime (non monotonic).
Also, using xtime_t instead of float preserves the precision.
Suggested by Bruno Haible.
* lib/xtime.h (xtime_make): Handle overflows of nanoseconds.
* modules/timevar (Depends-on): We need gethrxtime.
We no longer use times().
(Link): Update.
* lib/timevar.h (timevar_time_def): Use xtime_t.
* lib/timevar.c (set_to_current_time): Use gethrxtime.
(timevar_print): Instead of checking whether the timings themselves
are large enough for the timevar to be printed, check the percentages.
author | Akim Demaille <akim.demaille@gmail.com> |
---|---|
date | Fri, 12 Oct 2018 06:46:09 +0200 |
parents | 10eb9086bea0 |
children | b06060465f09 |
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/* xtime -- extended-resolution integer timestamps Copyright (C) 2005-2006, 2009-2018 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. */ #ifndef XTIME_H_ #define XTIME_H_ 1 #ifndef _GL_INLINE_HEADER_BEGIN #error "Please include config.h first." #endif _GL_INLINE_HEADER_BEGIN #ifndef XTIME_INLINE # define XTIME_INLINE _GL_INLINE #endif /* xtime_t is a signed type used for timestamps. 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 #ifdef __cplusplus extern "C" { #endif /* Return an extended time value that contains S seconds and NS nanoseconds. */ XTIME_INLINE xtime_t xtime_make (xtime_t s, long int ns) { const long int giga = 1000 * 1000 * 1000; s += ns / giga; ns %= giga; if (XTIME_PRECISION == 1) return s; else return XTIME_PRECISION * s + ns; } /* Return the number of seconds in T, which must be nonnegative. */ XTIME_INLINE xtime_t xtime_nonnegative_sec (xtime_t t) { return t / XTIME_PRECISION; } /* Return the number of seconds in T. */ XTIME_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. */ XTIME_INLINE long int xtime_nonnegative_nsec (xtime_t t) { return t % XTIME_PRECISION; } /* Return the number of nanoseconds in T. */ XTIME_INLINE long int xtime_nsec (xtime_t t) { long int ns = t % XTIME_PRECISION; if (ns < 0) ns += XTIME_PRECISION; return ns; } #ifdef __cplusplus } #endif #endif