chiark / gitweb /
DisOrder's event loop now stores its timeouts in heap sorted by
[disorder] / lib / timeval.h
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1/*
2 * This file is part of DisOrder.
3af7813d 3 * Copyright (C) 2007, 2008 Richard Kettlewell
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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 2 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, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * 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, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18 * USA
19 */
20
21#ifndef TIMEVAL_H
22#define TIMEVAL_H
23
24static inline struct timeval tvsub(const struct timeval a,
25 const struct timeval b) {
26 struct timeval r;
27
28 r.tv_sec = a.tv_sec - b.tv_sec;
29 r.tv_usec = a.tv_usec - b.tv_usec;
30 if(r.tv_usec < 0) {
31 r.tv_usec += 1000000;
32 r.tv_sec--;
33 }
34 if(r.tv_usec > 999999) {
35 r.tv_usec -= 1000000;
36 r.tv_sec++;
37 }
38 return r;
39}
40
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41static inline struct timeval tvadd(const struct timeval a,
42 const struct timeval b) {
43 struct timeval r;
44
45 r.tv_sec = a.tv_sec + b.tv_sec;
46 r.tv_usec = a.tv_usec + b.tv_usec;
47 if(r.tv_usec < 0) {
48 r.tv_usec += 1000000;
49 r.tv_sec--;
50 }
51 if(r.tv_usec > 999999) {
52 r.tv_usec -= 1000000;
53 r.tv_sec++;
54 }
55 return r;
56}
57
58static inline double tvdouble(const struct timeval a) {
59 return a.tv_sec + a.tv_usec / 1000000.0;
60}
61
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62static inline int64_t tvsub_us(const struct timeval a,
63 const struct timeval b) {
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64 return (((uint64_t)a.tv_sec * 1000000 + a.tv_usec)
65 - ((uint64_t)b.tv_sec * 1000000 + b.tv_usec));
66}
67
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68/** @brief Great-than comparison for timevals */
69static inline int tvgt(const struct timeval *a, const struct timeval *b) {
70 if(a->tv_sec > b->tv_sec)
71 return 1;
72 if(a->tv_sec == b->tv_sec
73 && a->tv_usec > b->tv_usec)
74 return 1;
75 return 0;
76}
77
78/** @brief Less-than
79 comparison for timevals */
80static inline int tvlt(const struct timeval *a, const struct timeval *b) {
81 if(a->tv_sec < b->tv_sec)
82 return 1;
83 if(a->tv_sec == b->tv_sec
84 && a->tv_usec < b->tv_usec)
85 return 1;
86 return 0;
87}
88
89/** @brief Greater-than-or-equal comparison for timevals */
90static inline int tvge(const struct timeval *a, const struct timeval *b) {
91 return !tvlt(a, b);
92}
93
94/** @brief Less-than-or-equal comparison for timevals */
95static inline int tvle(const struct timeval *a, const struct timeval *b) {
96 return !tvgt(a, b);
97}
98
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99#endif /* TIMEVAL_H */
100
101/*
102Local Variables:
103c-basic-offset:2
104comment-column:40
105fill-column:79
106indent-tabs-mode:nil
107End:
108*/