89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
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/* xtime -- extended-resolution integer timestamps
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Copyright (C) 2005-2006, 2009-2020 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Paul Eggert. */
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#ifndef XTIME_H_
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#define XTIME_H_ 1
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#ifndef _GL_INLINE_HEADER_BEGIN
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#error "Please include config.h first."
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#endif
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_GL_INLINE_HEADER_BEGIN
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#ifndef XTIME_INLINE
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# define XTIME_INLINE _GL_INLINE
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#endif
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/* xtime_t is a signed type used for timestamps. It is an integer
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type that is a count of nanoseconds. */
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typedef long long int xtime_t;
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#define XTIME_PRECISION 1000000000
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Return an extended time value that contains S seconds and NS
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nanoseconds. S and NS should be nonnegative; otherwise, integer
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overflow can occur even if the result is in range. */
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XTIME_INLINE xtime_t
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xtime_make (xtime_t s, long int ns)
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{
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return XTIME_PRECISION * s + ns;
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}
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/* The following functions split an extended time value:
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T = XTIME_PRECISION * xtime_sec (T) + xtime_nsec (T)
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with 0 <= xtime_nsec (T) < XTIME_PRECISION. */
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/* Return the number of seconds in T, which must be nonnegative. */
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XTIME_INLINE xtime_t
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xtime_nonnegative_sec (xtime_t t)
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{
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return t / XTIME_PRECISION;
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}
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/* Return the number of seconds in T. */
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XTIME_INLINE xtime_t
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xtime_sec (xtime_t t)
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{
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return (t + (t < 0)) / XTIME_PRECISION - (t < 0);
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}
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/* Return the number of nanoseconds in T, which must be nonnegative. */
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XTIME_INLINE long int
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xtime_nonnegative_nsec (xtime_t t)
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{
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return t % XTIME_PRECISION;
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}
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/* Return the number of nanoseconds in T. */
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XTIME_INLINE long int
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xtime_nsec (xtime_t t)
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{
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long int ns = t % XTIME_PRECISION;
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if (ns < 0)
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ns += XTIME_PRECISION;
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return ns;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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