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
|
/* Copyright (C) 2024 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
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/>.
*/
/*!
* \brief C11 atomic operations with fallbacks.
*/
#pragma once
#ifdef HAVE_C11_ATOMIC /* C11 */
#define KNOT_HAVE_ATOMIC
#include <stdatomic.h>
#define ATOMIC_SET(dst, val) atomic_store_explicit(&(dst), (val), memory_order_relaxed)
#define ATOMIC_GET(src) atomic_load_explicit(&(src), memory_order_relaxed)
#define ATOMIC_ADD(dst, val) (void)atomic_fetch_add_explicit(&(dst), (val), memory_order_relaxed)
#define ATOMIC_SUB(dst, val) (void)atomic_fetch_sub_explicit(&(dst), (val), memory_order_relaxed)
#define ATOMIC_XCHG(dst, val) atomic_exchange_explicit(&(dst), (val), memory_order_relaxed)
typedef atomic_uint_fast16_t knot_atomic_uint16_t;
typedef atomic_uint_fast64_t knot_atomic_uint64_t;
typedef atomic_size_t knot_atomic_size_t;
typedef _Atomic (void *) knot_atomic_ptr_t;
typedef atomic_bool knot_atomic_bool;
#elif defined(HAVE_GCC_ATOMIC) /* GCC __atomic */
#define KNOT_HAVE_ATOMIC
#include <stdint.h>
#include <stdbool.h>
#define ATOMIC_SET(dst, val) __atomic_store_n(&(dst), (val), __ATOMIC_RELAXED)
#define ATOMIC_GET(src) __atomic_load_n(&(src), __ATOMIC_RELAXED)
#define ATOMIC_ADD(dst, val) __atomic_add_fetch(&(dst), (val), __ATOMIC_RELAXED)
#define ATOMIC_SUB(dst, val) __atomic_sub_fetch(&(dst), (val), __ATOMIC_RELAXED)
#define ATOMIC_XCHG(dst, val) __atomic_exchange_n(&(dst), (val), __ATOMIC_RELAXED)
typedef uint16_t knot_atomic_uint16_t;
typedef uint64_t knot_atomic_uint64_t;
typedef size_t knot_atomic_size_t;
typedef void* knot_atomic_ptr_t;
typedef bool knot_atomic_bool;
#else /* Fallback, non-atomic. */
#warning "Atomic operations not availabe, using unreliable replacement."
#include <stdint.h>
#include <stdbool.h>
#define ATOMIC_SET(dst, val) ((dst) = (val))
#define ATOMIC_GET(src) (src)
#define ATOMIC_ADD(dst, val) ((dst) += (val))
#define ATOMIC_SUB(dst, val) ((dst) -= (val))
#define ATOMIC_XCHG(dst, val) ({ __typeof__ (dst) _z = (dst); (dst) = (val); _z; })
typedef uint16_t knot_atomic_uint16_t;
typedef uint64_t knot_atomic_uint64_t;
typedef size_t knot_atomic_size_t;
typedef void* knot_atomic_ptr_t;
typedef bool knot_atomic_bool;
#endif
|
