2 * This file is part of DisOrder.
3 * Copyright (C) 2007-2009, 2013 Richard Kettlewell
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 /** @file lib/timeval.h
19 * @brief Arithmetic on timeval structures
28 static inline struct timeval tvsub(const struct timeval a,
29 const struct timeval b) {
32 r.tv_sec = a.tv_sec - b.tv_sec;
33 r.tv_usec = a.tv_usec - b.tv_usec;
38 if(r.tv_usec > 999999) {
45 static inline struct timeval tvadd(const struct timeval a,
46 const struct timeval b) {
49 r.tv_sec = a.tv_sec + b.tv_sec;
50 r.tv_usec = a.tv_usec + b.tv_usec;
55 if(r.tv_usec > 999999) {
62 static inline double tvdouble(const struct timeval a) {
63 return a.tv_sec + a.tv_usec / 1000000.0;
66 static inline int64_t tvsub_us(const struct timeval a,
67 const struct timeval b) {
68 return (((uint64_t)a.tv_sec * 1000000 + a.tv_usec)
69 - ((uint64_t)b.tv_sec * 1000000 + b.tv_usec));
72 /** @brief Great-than comparison for timevals */
73 static inline int tvgt(const struct timeval *a, const struct timeval *b) {
74 if(a->tv_sec > b->tv_sec)
76 if(a->tv_sec == b->tv_sec
77 && a->tv_usec > b->tv_usec)
83 comparison for timevals */
84 static inline int tvlt(const struct timeval *a, const struct timeval *b) {
85 if(a->tv_sec < b->tv_sec)
87 if(a->tv_sec == b->tv_sec
88 && a->tv_usec < b->tv_usec)
93 /** @brief Greater-than-or-equal comparison for timevals */
94 static inline int tvge(const struct timeval *a, const struct timeval *b) {
98 /** @brief Less-than-or-equal comparison for timevals */
99 static inline int tvle(const struct timeval *a, const struct timeval *b) {
103 /** @brief Return the sum of two timespecs */
104 static inline struct timespec tsadd(const struct timespec a,
105 const struct timespec b) {
108 r.tv_sec = a.tv_sec + b.tv_sec;
109 r.tv_nsec = a.tv_nsec + b.tv_nsec;
111 r.tv_nsec += 1000000;
114 if(r.tv_nsec > 999999) {
115 r.tv_nsec -= 1000000;
121 /** @brief Subtract one timespec from another */
122 static inline struct timespec tssub(const struct timespec a,
123 const struct timespec b) {
126 r.tv_sec = a.tv_sec - b.tv_sec;
127 r.tv_nsec = a.tv_nsec - b.tv_nsec;
129 r.tv_nsec += 1000000;
132 if(r.tv_nsec > 999999) {
133 r.tv_nsec -= 1000000;
139 /** @brief Convert a timespec to a double */
140 static inline double ts_to_double(const struct timespec ts) {
141 return ts.tv_sec + ts.tv_nsec / 1000000000.0;
144 /** @brief Convert a double to a timespec */
145 static inline struct timespec double_to_ts(double n) {
150 r.tv_nsec = 1000000000 * f;
154 #endif /* TIMEVAL_H */