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 */