2 * collectd - src/daemon/utils_time.h
3 * Copyright (C) 2010-2015 Florian octo Forster
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
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10 * Software is furnished to do so, subject to the following conditions:
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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21 * DEALINGS IN THE SOFTWARE.
24 * Florian octo Forster <octo at collectd.org>
28 #define UTILS_TIME_H 1
33 * "cdtime_t" is a 64bit unsigned integer. The time is stored at a 2^-30 second
34 * resolution, i.e. the most significant 34 bit are used to store the time in
35 * seconds, the least significant bits store the sub-second part in something
36 * very close to nanoseconds. *The* big advantage of storing time in this
37 * manner is that comparing times and calculating differences is as simple as
38 * it is with "time_t", i.e. a simple integer comparison / subtraction works.
41 * cdtime_t is defined in "collectd.h" */
42 /* typedef uint64_t cdtime_t; */
44 /* 2^30 = 1073741824 */
45 #define TIME_T_TO_CDTIME_T(t) (((cdtime_t) (t)) << 30)
47 #define MS_TO_CDTIME_T(ms) (((((cdtime_t) (ms)) / 1000) << 30) | \
48 ((((((cdtime_t) (ms)) % 1000) << 30) + 500) / 1000))
49 #define US_TO_CDTIME_T(us) (((((cdtime_t) (us)) / 1000000) << 30) | \
50 ((((((cdtime_t) (us)) % 1000000) << 30) + 500000) / 1000000))
51 #define NS_TO_CDTIME_T(ns) (((((cdtime_t) (ns)) / 1000000000) << 30) | \
52 ((((((cdtime_t) (ns)) % 1000000000) << 30) + 500000000) / 1000000000))
54 #define CDTIME_T_TO_TIME_T(t) ((time_t) (((t) + (1 << 29)) >> 30))
55 #define CDTIME_T_TO_MS(t) ((uint64_t) ((((t) >> 30) * 1000) + \
56 ((((t) & 0x3fffffff) * 1000 + (1 << 29)) >> 30)))
57 #define CDTIME_T_TO_US(t) ((uint64_t) ((((t) >> 30) * 1000000) + \
58 ((((t) & 0x3fffffff) * 1000000 + (1 << 29)) >> 30)))
59 #define CDTIME_T_TO_NS(t) ((uint64_t) ((((t) >> 30) * 1000000000) + \
60 ((((t) & 0x3fffffff) * 1000000000 + (1 << 29)) >> 30)))
62 #define CDTIME_T_TO_DOUBLE(t) (((double) (t)) / 1073741824.0)
63 #define DOUBLE_TO_CDTIME_T(d) ((cdtime_t) ((d) * 1073741824.0))
65 #define CDTIME_T_TO_TIMEVAL(cdt,tvp) do { \
66 (tvp)->tv_sec = CDTIME_T_TO_TIME_T (cdt); \
67 (tvp)->tv_usec = (suseconds_t) CDTIME_T_TO_US ((cdt) & 0x3fffffff); \
69 #define TIMEVAL_TO_CDTIME_T(tv) US_TO_CDTIME_T(1000000 * (tv)->tv_sec + (tv)->tv_usec)
71 #define CDTIME_T_TO_TIMESPEC(cdt,tsp) do { \
72 (tsp)->tv_sec = CDTIME_T_TO_TIME_T (cdt); \
73 (tsp)->tv_nsec = (long) CDTIME_T_TO_NS ((cdt) & 0x3fffffff); \
75 #define TIMESPEC_TO_CDTIME_T(ts) NS_TO_CDTIME_T(1000000000ULL * (ts)->tv_sec + (ts)->tv_nsec)
77 cdtime_t cdtime (void);
79 /* format a cdtime_t value in ISO 8601 format:
80 * returns the number of characters written to the string (not including the
81 * terminating null byte or 0 on error; the function ensures that the string
82 * is null terminated */
83 size_t cdtime_to_iso8601 (char *s, size_t max, cdtime_t t);
85 #endif /* UTILS_TIME_H */
86 /* vim: set sw=2 sts=2 et : */