Add a compat dummy stdatomic.h used when threading is disabled
[libav.git] / compat / atomics / dummy / stdatomic.h
1 /*
2 * This file is part of Libav.
3 *
4 * Libav is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * Libav is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 /*
20 * based on vlc_atomic.h from VLC
21 * Copyright (C) 2010 RĂ©mi Denis-Courmont
22 */
23
24 #ifndef LIBAV_COMPAT_ATOMICS_DUMMY_STDATOMIC_H
25 #define LIBAV_COMPAT_ATOMICS_DUMMY_STDATOMIC_H
26
27 #include <stdint.h>
28
29 #define ATOMIC_FLAG_INIT 0
30
31 #define ATOMIC_VAR_INIT(value) (value)
32
33 #define atomic_init(obj, value) \
34 do { \
35 *(obj) = (value); \
36 } while(0)
37
38 #define kill_dependency(y) ((void)0)
39
40 #define atomic_thread_fence(order) \
41 ((void)0)
42
43 #define atomic_signal_fence(order) \
44 ((void)0)
45
46 #define atomic_is_lock_free(obj) 0
47
48 typedef intptr_t atomic_flag;
49 typedef intptr_t atomic_bool;
50 typedef intptr_t atomic_char;
51 typedef intptr_t atomic_schar;
52 typedef intptr_t atomic_uchar;
53 typedef intptr_t atomic_short;
54 typedef intptr_t atomic_ushort;
55 typedef intptr_t atomic_int;
56 typedef intptr_t atomic_uint;
57 typedef intptr_t atomic_long;
58 typedef intptr_t atomic_ulong;
59 typedef intptr_t atomic_llong;
60 typedef intptr_t atomic_ullong;
61 typedef intptr_t atomic_wchar_t;
62 typedef intptr_t atomic_int_least8_t;
63 typedef intptr_t atomic_uint_least8_t;
64 typedef intptr_t atomic_int_least16_t;
65 typedef intptr_t atomic_uint_least16_t;
66 typedef intptr_t atomic_int_least32_t;
67 typedef intptr_t atomic_uint_least32_t;
68 typedef intptr_t atomic_int_least64_t;
69 typedef intptr_t atomic_uint_least64_t;
70 typedef intptr_t atomic_int_fast8_t;
71 typedef intptr_t atomic_uint_fast8_t;
72 typedef intptr_t atomic_int_fast16_t;
73 typedef intptr_t atomic_uint_fast16_t;
74 typedef intptr_t atomic_int_fast32_t;
75 typedef intptr_t atomic_uint_fast32_t;
76 typedef intptr_t atomic_int_fast64_t;
77 typedef intptr_t atomic_uint_fast64_t;
78 typedef intptr_t atomic_intptr_t;
79 typedef intptr_t atomic_uintptr_t;
80 typedef intptr_t atomic_size_t;
81 typedef intptr_t atomic_ptrdiff_t;
82 typedef intptr_t atomic_intmax_t;
83 typedef intptr_t atomic_uintmax_t;
84
85 #define atomic_store(object, desired) \
86 do { \
87 *(object) = (desired); \
88 } while (0)
89
90 #define atomic_store_explicit(object, desired, order) \
91 atomic_store(object, desired)
92
93 #define atomic_load(object) \
94 (*(object))
95
96 #define atomic_load_explicit(object, order) \
97 atomic_load(object)
98
99 static inline intptr_t atomic_exchange(intptr_t *object, intptr_t desired)
100 {
101 intptr_t ret = *object;
102 *object = desired;
103 return ret;
104 }
105
106 #define atomic_exchange_explicit(object, desired, order) \
107 atomic_exchange(object, desired)
108
109 static inline int atomic_compare_exchange_strong(intptr_t *object, intptr_t *expected,
110 intptr_t desired)
111 {
112 int ret;
113 if (*object == *expected) {
114 *object = desired;
115 ret = 1;
116 } else {
117 *expected = *object;
118 ret = 0;
119 }
120 return ret;
121 }
122
123 #define atomic_compare_exchange_strong_explicit(object, expected, desired, success, failure) \
124 atomic_compare_exchange_strong(object, expected, desired)
125
126 #define atomic_compare_exchange_weak(object, expected, desired) \
127 atomic_compare_exchange_strong(object, expected, desired)
128
129 #define atomic_compare_exchange_weak_explicit(object, expected, desired, success, failure) \
130 atomic_compare_exchange_weak(object, expected, desired)
131
132 #define FETCH_MODIFY(opname, op) \
133 static inline intptr_t atomic_fetch_ ## opname(intptr_t *object, intptr_t operand) \
134 { \
135 intptr_t ret; \
136 ret = *object; \
137 *object = *object op operand; \
138 return ret; \
139 }
140
141 FETCH_MODIFY(add, +)
142 FETCH_MODIFY(sub, -)
143 FETCH_MODIFY(or, |)
144 FETCH_MODIFY(xor, ^)
145 FETCH_MODIFY(and, &)
146
147 #undef FETCH_MODIFY
148
149 #define atomic_fetch_add_explicit(object, operand, order) \
150 atomic_fetch_add(object, operand)
151
152 #define atomic_fetch_sub_explicit(object, operand, order) \
153 atomic_fetch_sub(object, operand)
154
155 #define atomic_fetch_or_explicit(object, operand, order) \
156 atomic_fetch_or(object, operand)
157
158 #define atomic_fetch_xor_explicit(object, operand, order) \
159 atomic_fetch_sub(object, operand)
160
161 #define atomic_fetch_and_explicit(object, operand, order) \
162 atomic_fetch_and(object, operand)
163
164 #define atomic_flag_test_and_set(object) \
165 atomic_exchange(object, 1)
166
167 #define atomic_flag_test_and_set_explicit(object, order) \
168 atomic_flag_test_and_set(object)
169
170 #define atomic_flag_clear(object) \
171 atomic_store(object, 0)
172
173 #define atomic_flag_clear_explicit(object, order) \
174 atomic_flag_clear(object)
175
176 #endif /* LIBAV_COMPAT_ATOMICS_DUMMY_STDATOMIC_H */