FFmpeg
stdatomic.h
Go to the documentation of this file.
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 RĂ©mi Denis-Courmont
22  */
23 
24 #ifndef COMPAT_ATOMICS_DUMMY_STDATOMIC_H
25 #define 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_xor(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 /* COMPAT_ATOMICS_DUMMY_STDATOMIC_H */
intptr_t atomic_flag
Definition: stdatomic.h:48
intptr_t atomic_bool
Definition: stdatomic.h:49
intptr_t atomic_uint_fast8_t
Definition: stdatomic.h:71
intptr_t atomic_ushort
Definition: stdatomic.h:54
intptr_t atomic_int
Definition: stdatomic.h:55
intptr_t atomic_int_least8_t
Definition: stdatomic.h:62
#define FETCH_MODIFY(opname, op)
Definition: stdatomic.h:132
intptr_t atomic_long
Definition: stdatomic.h:57
intptr_t atomic_int_least32_t
Definition: stdatomic.h:66
intptr_t atomic_int_fast16_t
Definition: stdatomic.h:72
intptr_t atomic_uintptr_t
Definition: stdatomic.h:79
intptr_t atomic_size_t
Definition: stdatomic.h:80
intptr_t atomic_int_fast32_t
Definition: stdatomic.h:74
intptr_t atomic_schar
Definition: stdatomic.h:51
intptr_t atomic_llong
Definition: stdatomic.h:59
intptr_t atomic_int_fast8_t
Definition: stdatomic.h:70
intptr_t atomic_ulong
Definition: stdatomic.h:58
static intptr_t atomic_exchange(intptr_t *object, intptr_t desired)
Definition: stdatomic.h:99
intptr_t atomic_uint_fast16_t
Definition: stdatomic.h:73
intptr_t atomic_int_least16_t
Definition: stdatomic.h:64
static int atomic_compare_exchange_strong(intptr_t *object, intptr_t *expected, intptr_t desired)
Definition: stdatomic.h:109
intptr_t atomic_uint
Definition: stdatomic.h:56
intptr_t atomic_uint_fast32_t
Definition: stdatomic.h:75
intptr_t atomic_uint_least32_t
Definition: stdatomic.h:67
intptr_t atomic_int_fast64_t
Definition: stdatomic.h:76
intptr_t atomic_uchar
Definition: stdatomic.h:52
intptr_t atomic_short
Definition: stdatomic.h:53
intptr_t atomic_uint_least16_t
Definition: stdatomic.h:65
intptr_t atomic_intptr_t
Definition: stdatomic.h:78
intptr_t atomic_intmax_t
Definition: stdatomic.h:82
intptr_t atomic_uint_fast64_t
Definition: stdatomic.h:77
intptr_t atomic_ullong
Definition: stdatomic.h:60
intptr_t atomic_uintmax_t
Definition: stdatomic.h:83
intptr_t atomic_int_least64_t
Definition: stdatomic.h:68
intptr_t atomic_char
Definition: stdatomic.h:50
intptr_t atomic_ptrdiff_t
Definition: stdatomic.h:81
intptr_t atomic_wchar_t
Definition: stdatomic.h:61
intptr_t atomic_uint_least8_t
Definition: stdatomic.h:63
intptr_t atomic_uint_least64_t
Definition: stdatomic.h:69