/* xtime -- extended-resolution integer time stamps Copyright (C) 2005, 2006 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 2, 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, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ /* Written by Paul Eggert. */ #ifndef XTIME_H_ # define XTIME_H_ 1 /* xtime_t is a signed type used for time stamps. 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 typedef long int xtime_t; # if LONG_MAX >> 31 >> 31 == 0 # define XTIME_PRECISION 1 # else # define XTIME_PRECISION 1000000000 # endif # endif /* Return an extended time value that contains S seconds and NS nanoseconds, without any overflow checking. */ static inline xtime_t xtime_make (xtime_t s, long int ns) { if (XTIME_PRECISION == 1) return s; else return XTIME_PRECISION * s + ns; } /* Return the number of seconds in T, which must be nonnegative. */ static inline xtime_t xtime_nonnegative_sec (xtime_t t) { return t / XTIME_PRECISION; } /* Return the number of seconds in T. */ static 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. */ static inline long int xtime_nonnegative_nsec (xtime_t t) { return t % XTIME_PRECISION; } /* Return the number of nanoseconds in T. */ static inline long int xtime_nsec (xtime_t t) { long int ns = t % XTIME_PRECISION; if (ns < 0) ns += XTIME_PRECISION; return ns; } #endif