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Diffstat (limited to 'gl/timespec.h')
-rw-r--r-- | gl/timespec.h | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/gl/timespec.h b/gl/timespec.h deleted file mode 100644 index a5eca79..0000000 --- a/gl/timespec.h +++ /dev/null @@ -1,112 +0,0 @@ -/* timespec -- System time interface - - Copyright (C) 2000, 2002, 2004-2005, 2007, 2009-2017 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/>. */ - -#if ! defined TIMESPEC_H -# define TIMESPEC_H - -# include <time.h> - -#ifndef _GL_INLINE_HEADER_BEGIN - #error "Please include config.h first." -#endif -_GL_INLINE_HEADER_BEGIN -#ifndef _GL_TIMESPEC_INLINE -# define _GL_TIMESPEC_INLINE _GL_INLINE -#endif - -/* Resolution of timespec timestamps (in units per second), and log - base 10 of the resolution. */ - -enum { TIMESPEC_RESOLUTION = 1000000000 }; -enum { LOG10_TIMESPEC_RESOLUTION = 9 }; - -/* Return a timespec with seconds S and nanoseconds NS. */ - -_GL_TIMESPEC_INLINE struct timespec -make_timespec (time_t s, long int ns) -{ - struct timespec r; - r.tv_sec = s; - r.tv_nsec = ns; - return r; -} - -/* Return negative, zero, positive if A < B, A == B, A > B, respectively. - - For each timestamp T, this code assumes that either: - - * T.tv_nsec is in the range 0..999999999; or - * T.tv_sec corresponds to a valid leap second on a host that supports - leap seconds, and T.tv_nsec is in the range 1000000000..1999999999; or - * T.tv_sec is the minimum time_t value and T.tv_nsec is -1; or - T.tv_sec is the maximum time_t value and T.tv_nsec is 2000000000. - This allows for special struct timespec values that are less or - greater than all possible valid timestamps. - - In all these cases, it is safe to subtract two tv_nsec values and - convert the result to integer without worrying about overflow on - any platform of interest to the GNU project, since all such - platforms have 32-bit int or wider. - - Replacing "(int) (a.tv_nsec - b.tv_nsec)" with something like - "a.tv_nsec < b.tv_nsec ? -1 : a.tv_nsec > b.tv_nsec" would cause - this function to work in some cases where the above assumption is - violated, but not in all cases (e.g., a.tv_sec==1, a.tv_nsec==-2, - b.tv_sec==0, b.tv_nsec==999999999) and is arguably not worth the - extra instructions. Using a subtraction has the advantage of - detecting some invalid cases on platforms that detect integer - overflow. - - The (int) cast avoids a gcc -Wconversion warning. */ - -_GL_TIMESPEC_INLINE int _GL_ATTRIBUTE_PURE -timespec_cmp (struct timespec a, struct timespec b) -{ - return (a.tv_sec < b.tv_sec ? -1 - : a.tv_sec > b.tv_sec ? 1 - : (int) (a.tv_nsec - b.tv_nsec)); -} - -/* Return -1, 0, 1, depending on the sign of A. A.tv_nsec must be - nonnegative. */ -_GL_TIMESPEC_INLINE int _GL_ATTRIBUTE_PURE -timespec_sign (struct timespec a) -{ - return a.tv_sec < 0 ? -1 : a.tv_sec || a.tv_nsec; -} - -struct timespec timespec_add (struct timespec, struct timespec) - _GL_ATTRIBUTE_CONST; -struct timespec timespec_sub (struct timespec, struct timespec) - _GL_ATTRIBUTE_CONST; -struct timespec dtotimespec (double) - _GL_ATTRIBUTE_CONST; - -/* Return an approximation to A, of type 'double'. */ -_GL_TIMESPEC_INLINE double -timespectod (struct timespec a) -{ - return a.tv_sec + a.tv_nsec / 1e9; -} - -void gettime (struct timespec *); -int settime (struct timespec const *); - -_GL_INLINE_HEADER_END - -#endif |