1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 Rémi Denis-Courmont
22 */
23
24 #ifndef COMPAT_ATOMICS_PTHREAD_STDATOMIC_H
25 #define COMPAT_ATOMICS_PTHREAD_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_signal_fence(order) \
41 ((void)0)
42
43 #define atomic_is_lock_free(obj) 0
44
45 typedef intptr_t atomic_flag;
46 typedef intptr_t atomic_bool;
47 typedef intptr_t atomic_char;
48 typedef intptr_t atomic_schar;
49 typedef intptr_t atomic_uchar;
50 typedef intptr_t atomic_short;
51 typedef intptr_t atomic_ushort;
52 typedef intptr_t atomic_int;
53 typedef intptr_t atomic_uint;
54 typedef intptr_t atomic_long;
55 typedef intptr_t atomic_ulong;
56 typedef intptr_t atomic_llong;
57 typedef intptr_t atomic_ullong;
58 typedef intptr_t atomic_wchar_t;
59 typedef intptr_t atomic_int_least8_t;
60 typedef intptr_t atomic_uint_least8_t;
61 typedef intptr_t atomic_int_least16_t;
62 typedef intptr_t atomic_uint_least16_t;
63 typedef intptr_t atomic_int_least32_t;
64 typedef intptr_t atomic_uint_least32_t;
65 typedef intptr_t atomic_int_least64_t;
66 typedef intptr_t atomic_uint_least64_t;
67 typedef intptr_t atomic_int_fast8_t;
68 typedef intptr_t atomic_uint_fast8_t;
69 typedef intptr_t atomic_int_fast16_t;
70 typedef intptr_t atomic_uint_fast16_t;
71 typedef intptr_t atomic_int_fast32_t;
72 typedef intptr_t atomic_uint_fast32_t;
73 typedef intptr_t atomic_int_fast64_t;
74 typedef intptr_t atomic_uint_fast64_t;
75 typedef intptr_t atomic_intptr_t;
76 typedef intptr_t atomic_uintptr_t;
77 typedef intptr_t atomic_size_t;
78 typedef intptr_t atomic_ptrdiff_t;
79 typedef intptr_t atomic_intmax_t;
80 typedef intptr_t atomic_uintmax_t;
81
82 void avpriv_atomic_lock(void);
83 void avpriv_atomic_unlock(void);
84
atomic_thread_fence(int order)85 static inline void atomic_thread_fence(int order)
86 {
87 avpriv_atomic_lock();
88 avpriv_atomic_unlock();
89 }
90
atomic_store(intptr_t * object,intptr_t desired)91 static inline void atomic_store(intptr_t *object, intptr_t desired)
92 {
93 avpriv_atomic_lock();
94 *object = desired;
95 avpriv_atomic_unlock();
96 }
97
98 #define atomic_store_explicit(object, desired, order) \
99 atomic_store(object, desired)
100
atomic_load(intptr_t * object)101 static inline intptr_t atomic_load(intptr_t *object)
102 {
103 intptr_t ret;
104 avpriv_atomic_lock();
105 ret = *object;
106 avpriv_atomic_unlock();
107 return ret;
108 }
109
110 #define atomic_load_explicit(object, order) \
111 atomic_load(object)
112
atomic_exchange(intptr_t * object,intptr_t desired)113 static inline intptr_t atomic_exchange(intptr_t *object, intptr_t desired)
114 {
115 intptr_t ret;
116 avpriv_atomic_lock();
117 ret = *object;
118 *object = desired;
119 avpriv_atomic_unlock();
120 return ret;
121 }
122
123 #define atomic_exchange_explicit(object, desired, order) \
124 atomic_exchange(object, desired)
125
atomic_compare_exchange_strong(intptr_t * object,intptr_t * expected,intptr_t desired)126 static inline int atomic_compare_exchange_strong(intptr_t *object, intptr_t *expected,
127 intptr_t desired)
128 {
129 int ret;
130 avpriv_atomic_lock();
131 if (*object == *expected) {
132 ret = 1;
133 *object = desired;
134 } else {
135 ret = 0;
136 *expected = *object;
137 }
138 avpriv_atomic_unlock();
139 return ret;
140 }
141
142 #define atomic_compare_exchange_strong_explicit(object, expected, desired, success, failure) \
143 atomic_compare_exchange_strong(object, expected, desired)
144
145 #define atomic_compare_exchange_weak(object, expected, desired) \
146 atomic_compare_exchange_strong(object, expected, desired)
147
148 #define atomic_compare_exchange_weak_explicit(object, expected, desired, success, failure) \
149 atomic_compare_exchange_weak(object, expected, desired)
150
151 #define FETCH_MODIFY(opname, op) \
152 static inline intptr_t atomic_fetch_ ## opname(intptr_t *object, intptr_t operand) \
153 { \
154 intptr_t ret; \
155 avpriv_atomic_lock(); \
156 ret = *object; \
157 *object = *object op operand; \
158 avpriv_atomic_unlock(); \
159 return ret; \
160 }
161
162 FETCH_MODIFY(add, +)
163 FETCH_MODIFY(sub, -)
164 FETCH_MODIFY(or, |)
165 FETCH_MODIFY(xor, ^)
166 FETCH_MODIFY(and, &)
167
168 #undef FETCH_MODIFY
169
170 #define atomic_fetch_add_explicit(object, operand, order) \
171 atomic_fetch_add(object, operand)
172
173 #define atomic_fetch_sub_explicit(object, operand, order) \
174 atomic_fetch_sub(object, operand)
175
176 #define atomic_fetch_or_explicit(object, operand, order) \
177 atomic_fetch_or(object, operand)
178
179 #define atomic_fetch_xor_explicit(object, operand, order) \
180 atomic_fetch_xor(object, operand)
181
182 #define atomic_fetch_and_explicit(object, operand, order) \
183 atomic_fetch_and(object, operand)
184
185 #define atomic_flag_test_and_set(object) \
186 atomic_exchange(object, 1)
187
188 #define atomic_flag_test_and_set_explicit(object, order) \
189 atomic_flag_test_and_set(object)
190
191 #define atomic_flag_clear(object) \
192 atomic_store(object, 0)
193
194 #define atomic_flag_clear_explicit(object, order) \
195 atomic_flag_clear(object)
196
197 #endif /* COMPAT_ATOMICS_PTHREAD_STDATOMIC_H */
198