blob: 9edd12392db91ee880b81c521706230e68f6d2b2 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
/* xtime -- extended-resolution integer timestamps
Copyright (C) 2005-2006, 2009-2019 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Paul Eggert. */
#ifndef XTIME_H_
#define XTIME_H_ 1
#ifndef _GL_INLINE_HEADER_BEGIN
#error "Please include config.h first."
#endif
_GL_INLINE_HEADER_BEGIN
#ifndef XTIME_INLINE
# define XTIME_INLINE _GL_INLINE
#endif
/* xtime_t is a signed type used for timestamps. It is an integer
type that is a count of nanoseconds -- except for obsolescent hosts
without sufficiently-wide integers, where it is a count of
seconds. */
#if HAVE_LONG_LONG_INT
typedef long long int xtime_t;
# define XTIME_PRECISION 1000000000
#else
# include <limits.h>
typedef long int xtime_t;
# if LONG_MAX >> 31 >> 31 == 0
# define XTIME_PRECISION 1
# else
# define XTIME_PRECISION 1000000000
# endif
#endif
#ifdef __cplusplus
extern "C" {
#endif
/* Return an extended time value that contains S seconds and NS
nanoseconds. */
XTIME_INLINE xtime_t
xtime_make (xtime_t s, long int ns)
{
const long int giga = 1000 * 1000 * 1000;
s += ns / giga;
ns %= giga;
if (XTIME_PRECISION == 1)
return s;
else
return XTIME_PRECISION * s + ns;
}
/* Return the number of seconds in T, which must be nonnegative. */
XTIME_INLINE xtime_t
xtime_nonnegative_sec (xtime_t t)
{
return t / XTIME_PRECISION;
}
/* Return the number of seconds in T. */
XTIME_INLINE xtime_t
xtime_sec (xtime_t t)
{
return (XTIME_PRECISION == 1
? t
: t < 0
? (t + XTIME_PRECISION - 1) / XTIME_PRECISION - 1
: xtime_nonnegative_sec (t));
}
/* Return the number of nanoseconds in T, which must be nonnegative. */
XTIME_INLINE long int
xtime_nonnegative_nsec (xtime_t t)
{
return t % XTIME_PRECISION;
}
/* Return the number of nanoseconds in T. */
XTIME_INLINE long int
xtime_nsec (xtime_t t)
{
long int ns = t % XTIME_PRECISION;
if (ns < 0)
ns += XTIME_PRECISION;
return ns;
}
#ifdef __cplusplus
}
#endif
#endif
|
