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
|
/*
* The Rin Library – special definitions
*
* Copyright (C) 2015-2019 Gediminas Jakutis
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; version 2.1
* of the License.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef LIBRIN_DEFINITIONS_INCLUDED
#define LIBRIN_DEFINITIONS_INCLUDED
/* gcc */
#ifdef __GNUC__
/* weak symbols */
# define WEAK_SYM __attribute__((weak))
/* allow the compiler to check varargs */
# define FORMAT_STRING(a, b) __attribute__((format (gnu_printf, a, b)))
/* optimizing likely / unlikely branches */
# define likely(a) (__builtin_expect(!!(a), 1))
# define unlikely(a) (__builtin_expect(!!(a), 0))
/* MSVC */
#elif defined(_MSC_VER)
/* weak symbols */
# define WEAK_SYM __declspec(selectany)
# define FORMAT_STRING(a, b)
/* optimizing likely / unlikely branches */
# define likely(a) (a)
# define unlikely(a) (a)
/* the rest – NOOP */
#else
# define WEAK_SYM
# define FORMAT_STRING(a, b)
# define likely(a) (a)
# define unlikely(a) (a)
#endif
#define rin_once(func) \
do { \
static unsigned int __rin_firstrun = 1; \
if (__rin_firstrun) { \
--__rin_firstrun; \
func; \
} \
} while (0)
/* CLOCK_MONOTONIC is prefered when available, as
* it does not suffer from discontinous jumps.
* Otherwise use CLOCK_REALTIME as fallback.
*/
#if defined CLOCK_MONOTONIC
# define RIN_CLOCK_WALL_COUNTER CLOCK_MONOTONIC
#else
# define RIN_CLOCK_WALL_COUNTER CLOCK_REALTIME
#endif /* defined CLOCK_MONOTONIC */
#endif /* LIBRIN_DEFINITIONS_INCLUDED */
|
