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/*
* Ouroboros - Copyright (C) 2016 - 2024
*
* Time utilities
*
* Dimitri Staessens <dimitri@ouroboros.rocks>
* Sander Vrijders <sander@ouroboros.rocks>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#ifndef OUROBOROS_LIB_TIME_H
#define OUROBOROS_LIB_TIME_H
#ifdef MILLION
#undef MILLION
#endif
#ifdef BILLION
#undef BILLION
#endif
#define MILLION 1000000L
#define BILLION 1000000000L
#include <time.h>
#include <sys/time.h>
#define TIMESPEC_INIT_S(s) {(s), 0}
#define TIMESPEC_INIT_MS(ms) {(ms) / 1000, ((ms) % 1000) * MILLION}
#define TIMESPEC_INIT_US(us) {(us) / MILLION, ((us) % MILLION) * 1000}
#define TIMESPEC_INIT_NS(ns) {(ns) / BILLION, ((ns) % BILLION)}
#define TIMEVAL_INIT_S(s) {(s), 0}
#define TIMEVAL_INIT_MS(ms) {(ms) / 1000, ((ms) % 1000) * 1000}
#define TIMEVAL_INIT_US(us) {(us) / MILLION, ((us) % MILLION)}
/* functions for timespecs */
#define ts_diff_ns(t0, tx) (((tx)->tv_sec - (t0)->tv_sec) * BILLION \
+ ((tx)->tv_nsec - (t0)->tv_nsec))
#define ts_diff_us(t0, tx) (((tx)->tv_sec - (t0)->tv_sec) * MILLION \
+ ((tx)->tv_nsec - (t0)->tv_nsec) / 1000L)
#define ts_diff_ms(t0, tx) (((tx)->tv_sec - (t0)->tv_sec) * 1000L \
+ ((tx)->tv_nsec - (t0)->tv_nsec) / MILLION)
/* functions for timevals are the same */
#define tv_diff_us(t0, tx) (((tx)->tv_sec - (t0)->tv_sec) * MILLION \
+ ((tx)->tv_usec - (t0)->tv_usec) / 1000L)
#define tv_diff_ms(t0, tx) (((tx)->tv_sec - (t0)->tv_sec) * 1000L \
+ ((tx)->tv_usec - (t0)->tv_usec) / MILLION)
/* functions for timespecs */
#define ts_add(t, intv, res) \
do { \
time_t nanos = 0; \
nanos = (t)->tv_nsec + (intv)->tv_nsec; \
(res)->tv_sec = (t)->tv_sec + (intv)->tv_sec; \
while (nanos >= BILLION) { \
nanos -= BILLION; \
++((res)->tv_sec); \
} \
(res)->tv_nsec = nanos; \
} while (0);
#define ts_diff(t, intv, res) \
do { \
time_t nanos = 0; \
nanos = (t)->tv_nsec - (intv)->tv_nsec; \
(res)->tv_sec = (t)->tv_sec - (intv)->tv_sec; \
while (nanos < 0) { \
nanos += BILLION; \
--((res)->tv_sec); \
} \
(res)->tv_nsec = nanos; \
} while (0);
/* functions for timevals */
#define tv_add(t, intv, res) \
do { \
time_t micros = 0; \
micros = (t)->tv_usec + (intv)->tv_usec; \
(res)->tv_sec = (t)->tv_sec + (intv)->tv_sec; \
while (micros >= MILLION) { \
micros -= MILLION; \
++((res)->tv_sec); \
} \
(res)->tv_usec = micros; \
} while (0);
#define tv_diff(t, intv, res) \
do { \
time_t micros = 0; \
micros = (t)->tv_usec - (intv)->tv_usec; \
(res)->tv_sec = (t)->tv_sec - (intv)->tv_sec; \
while (micros < 0) { \
micros += MILLION; \
--((res)->tv_sec); \
} \
(res)->tv_usec = micros; \
} while (0);
/* copying a timeval into a timespec */
#define tv_to_ts(tv, ts) \
do { \
(ts)->tv_sec = (tv)->tv_sec; \
(ts)->tv_nsec = (tv)->tv_usec * 1000L; \
} while (0);
/* copying a timespec into a timeval (loss of resolution) */
#define ts_to_tv(ts, tv) \
do { \
(tv)->tv_sec = (ts)->tv_sec; \
(tv)->tv_usec = (ts)->tv_nsec / 1000L; \
} while (0);
#endif /* OUROBOROS_LIB_TIME_H */
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