| 1 | /* |
| 2 | * This file is part of DisOrder. |
| 3 | * Copyright (C) 2007-2009, 2013 Richard Kettlewell |
| 4 | * |
| 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. |
| 9 | * |
| 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. |
| 14 | * |
| 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/>. |
| 17 | */ |
| 18 | /** @file lib/timeval.h |
| 19 | * @brief Arithmetic on timeval structures |
| 20 | */ |
| 21 | #ifndef TIMEVAL_H |
| 22 | #define TIMEVAL_H |
| 23 | |
| 24 | #include <time.h> |
| 25 | #include <sys/time.h> |
| 26 | #include <math.h> |
| 27 | |
| 28 | static inline struct timeval tvsub(const struct timeval a, |
| 29 | const struct timeval b) { |
| 30 | struct timeval r; |
| 31 | |
| 32 | r.tv_sec = a.tv_sec - b.tv_sec; |
| 33 | r.tv_usec = a.tv_usec - b.tv_usec; |
| 34 | if(r.tv_usec < 0) { |
| 35 | r.tv_usec += 1000000; |
| 36 | r.tv_sec--; |
| 37 | } |
| 38 | if(r.tv_usec > 999999) { |
| 39 | r.tv_usec -= 1000000; |
| 40 | r.tv_sec++; |
| 41 | } |
| 42 | return r; |
| 43 | } |
| 44 | |
| 45 | static inline struct timeval tvadd(const struct timeval a, |
| 46 | const struct timeval b) { |
| 47 | struct timeval r; |
| 48 | |
| 49 | r.tv_sec = a.tv_sec + b.tv_sec; |
| 50 | r.tv_usec = a.tv_usec + b.tv_usec; |
| 51 | if(r.tv_usec < 0) { |
| 52 | r.tv_usec += 1000000; |
| 53 | r.tv_sec--; |
| 54 | } |
| 55 | if(r.tv_usec > 999999) { |
| 56 | r.tv_usec -= 1000000; |
| 57 | r.tv_sec++; |
| 58 | } |
| 59 | return r; |
| 60 | } |
| 61 | |
| 62 | static inline double tvdouble(const struct timeval a) { |
| 63 | return a.tv_sec + a.tv_usec / 1000000.0; |
| 64 | } |
| 65 | |
| 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)); |
| 70 | } |
| 71 | |
| 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) |
| 75 | return 1; |
| 76 | if(a->tv_sec == b->tv_sec |
| 77 | && a->tv_usec > b->tv_usec) |
| 78 | return 1; |
| 79 | return 0; |
| 80 | } |
| 81 | |
| 82 | /** @brief Less-than |
| 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) |
| 86 | return 1; |
| 87 | if(a->tv_sec == b->tv_sec |
| 88 | && a->tv_usec < b->tv_usec) |
| 89 | return 1; |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | /** @brief Greater-than-or-equal comparison for timevals */ |
| 94 | static inline int tvge(const struct timeval *a, const struct timeval *b) { |
| 95 | return !tvlt(a, b); |
| 96 | } |
| 97 | |
| 98 | /** @brief Less-than-or-equal comparison for timevals */ |
| 99 | static inline int tvle(const struct timeval *a, const struct timeval *b) { |
| 100 | return !tvgt(a, b); |
| 101 | } |
| 102 | |
| 103 | /** @brief Return the sum of two timespecs */ |
| 104 | static inline struct timespec tsadd(const struct timespec a, |
| 105 | const struct timespec b) { |
| 106 | struct timespec r; |
| 107 | |
| 108 | r.tv_sec = a.tv_sec + b.tv_sec; |
| 109 | r.tv_nsec = a.tv_nsec + b.tv_nsec; |
| 110 | if(r.tv_nsec < 0) { |
| 111 | r.tv_nsec += 1000000; |
| 112 | r.tv_sec--; |
| 113 | } |
| 114 | if(r.tv_nsec > 999999) { |
| 115 | r.tv_nsec -= 1000000; |
| 116 | r.tv_sec++; |
| 117 | } |
| 118 | return r; |
| 119 | } |
| 120 | |
| 121 | /** @brief Subtract one timespec from another */ |
| 122 | static inline struct timespec tssub(const struct timespec a, |
| 123 | const struct timespec b) { |
| 124 | struct timespec r; |
| 125 | |
| 126 | r.tv_sec = a.tv_sec - b.tv_sec; |
| 127 | r.tv_nsec = a.tv_nsec - b.tv_nsec; |
| 128 | if(r.tv_nsec < 0) { |
| 129 | r.tv_nsec += 1000000; |
| 130 | r.tv_sec--; |
| 131 | } |
| 132 | if(r.tv_nsec > 999999) { |
| 133 | r.tv_nsec -= 1000000; |
| 134 | r.tv_sec++; |
| 135 | } |
| 136 | return r; |
| 137 | } |
| 138 | |
| 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; |
| 142 | } |
| 143 | |
| 144 | /** @brief Convert a double to a timespec */ |
| 145 | static inline struct timespec double_to_ts(double n) { |
| 146 | double i, f; |
| 147 | struct timespec r; |
| 148 | f = modf(n, &i); |
| 149 | r.tv_sec = i; |
| 150 | r.tv_nsec = 1000000000 * f; |
| 151 | return r; |
| 152 | } |
| 153 | |
| 154 | #endif /* TIMEVAL_H */ |
| 155 | |
| 156 | /* |
| 157 | Local Variables: |
| 158 | c-basic-offset:2 |
| 159 | comment-column:40 |
| 160 | fill-column:79 |
| 161 | indent-tabs-mode:nil |
| 162 | End: |
| 163 | */ |