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31a3fc6e | 1 | /* |
7d53f6b0 | 2 | * Copyright (c) 2013, 2014 Nicira, Inc. |
31a3fc6e BP |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | /* This header implements atomic operation primitives using pthreads. */ | |
18 | #ifndef IN_OVS_ATOMIC_H | |
19 | #error "This header should only be included indirectly via ovs-atomic.h." | |
20 | #endif | |
21 | ||
1bd2c9ed BP |
22 | #include "ovs-atomic-locked.h" |
23 | ||
31a3fc6e BP |
24 | #define OVS_ATOMIC_PTHREADS_IMPL 1 |
25 | ||
1bd2c9ed | 26 | #define ATOMIC(TYPE) TYPE |
31a3fc6e BP |
27 | |
28 | #define ATOMIC_BOOL_LOCK_FREE 0 | |
31a3fc6e | 29 | #define ATOMIC_CHAR_LOCK_FREE 0 |
31a3fc6e | 30 | #define ATOMIC_SHORT_LOCK_FREE 0 |
31a3fc6e | 31 | #define ATOMIC_INT_LOCK_FREE 0 |
31a3fc6e | 32 | #define ATOMIC_LONG_LOCK_FREE 0 |
31a3fc6e | 33 | #define ATOMIC_LLONG_LOCK_FREE 0 |
31a3fc6e | 34 | #define ATOMIC_POINTER_LOCK_FREE 0 |
31a3fc6e BP |
35 | |
36 | typedef enum { | |
37 | memory_order_relaxed, | |
38 | memory_order_consume, | |
39 | memory_order_acquire, | |
40 | memory_order_release, | |
41 | memory_order_acq_rel, | |
42 | memory_order_seq_cst | |
43 | } memory_order; | |
44 | ||
1bd2c9ed BP |
45 | #define ATOMIC_VAR_INIT(VALUE) (VALUE) |
46 | #define atomic_init(OBJECT, VALUE) (*(OBJECT) = (VALUE), (void) 0) | |
31a3fc6e BP |
47 | |
48 | static inline void | |
49 | atomic_thread_fence(memory_order order OVS_UNUSED) | |
50 | { | |
51 | /* Nothing to do. */ | |
52 | } | |
53 | ||
54 | static inline void | |
55 | atomic_signal_fence(memory_order order OVS_UNUSED) | |
56 | { | |
57 | /* Nothing to do. */ | |
58 | } | |
59 | ||
60 | #define atomic_is_lock_free(OBJ) false | |
61 | ||
1bd2c9ed | 62 | #define atomic_store(DST, SRC) atomic_store_locked(DST, SRC) |
31a3fc6e BP |
63 | #define atomic_store_explicit(DST, SRC, ORDER) \ |
64 | ((void) (ORDER), atomic_store(DST, SRC)) | |
65 | ||
1bd2c9ed | 66 | #define atomic_read(SRC, DST) atomic_read_locked(SRC, DST) |
31a3fc6e BP |
67 | #define atomic_read_explicit(SRC, DST, ORDER) \ |
68 | ((void) (ORDER), atomic_read(SRC, DST)) | |
69 | ||
25045d75 JR |
70 | #define atomic_compare_exchange_strong(DST, EXP, SRC) \ |
71 | atomic_compare_exchange_locked(DST, EXP, SRC) | |
72 | #define atomic_compare_exchange_strong_explicit(DST, EXP, SRC, ORD1, ORD2) \ | |
73 | ((void) (ORD1), (void) (ORD2), \ | |
74 | atomic_compare_exchange_strong(DST, EXP, SRC)) | |
75 | #define atomic_compare_exchange_weak \ | |
76 | atomic_compare_exchange_strong | |
77 | #define atomic_compare_exchange_weak_explicit \ | |
78 | atomic_compare_exchange_strong_explicit | |
79 | ||
1bd2c9ed BP |
80 | #define atomic_add(RMW, ARG, ORIG) atomic_op_locked(RMW, add, ARG, ORIG) |
81 | #define atomic_sub(RMW, ARG, ORIG) atomic_op_locked(RMW, sub, ARG, ORIG) | |
82 | #define atomic_or( RMW, ARG, ORIG) atomic_op_locked(RMW, or, ARG, ORIG) | |
83 | #define atomic_xor(RMW, ARG, ORIG) atomic_op_locked(RMW, xor, ARG, ORIG) | |
84 | #define atomic_and(RMW, ARG, ORIG) atomic_op_locked(RMW, and, ARG, ORIG) | |
85 | ||
86 | #define atomic_add_explicit(RMW, ARG, ORIG, ORDER) \ | |
87 | ((void) (ORDER), atomic_add(RMW, ARG, ORIG)) | |
88 | #define atomic_sub_explicit(RMW, ARG, ORIG, ORDER) \ | |
89 | ((void) (ORDER), atomic_sub(RMW, ARG, ORIG)) | |
90 | #define atomic_or_explicit(RMW, ARG, ORIG, ORDER) \ | |
91 | ((void) (ORDER), atomic_or(RMW, ARG, ORIG)) | |
92 | #define atomic_xor_explicit(RMW, ARG, ORIG, ORDER) \ | |
93 | ((void) (ORDER), atomic_xor(RMW, ARG, ORIG)) | |
94 | #define atomic_and_explicit(RMW, ARG, ORIG, ORDER) \ | |
95 | ((void) (ORDER), atomic_and(RMW, ARG, ORIG)) | |
31a3fc6e BP |
96 | \f |
97 | /* atomic_flag */ | |
98 | ||
99 | typedef struct { | |
100 | bool b; | |
31a3fc6e | 101 | } atomic_flag; |
4dff0893 | 102 | #define ATOMIC_FLAG_INIT { false } |
31a3fc6e | 103 | |
4dff0893 BP |
104 | static inline bool |
105 | atomic_flag_test_and_set(volatile atomic_flag *flag_) | |
106 | { | |
107 | atomic_flag *flag = CONST_CAST(atomic_flag *, flag_); | |
108 | bool old_value; | |
109 | ||
110 | atomic_lock__(flag); | |
111 | old_value = flag->b; | |
112 | flag->b = true; | |
113 | atomic_unlock__(flag); | |
4597d2a5 | 114 | |
4dff0893 BP |
115 | return old_value; |
116 | } | |
117 | ||
118 | static inline bool | |
119 | atomic_flag_test_and_set_explicit(volatile atomic_flag *flag, | |
120 | memory_order order OVS_UNUSED) | |
121 | { | |
122 | return atomic_flag_test_and_set(flag); | |
123 | } | |
124 | ||
125 | static inline void | |
126 | atomic_flag_clear(volatile atomic_flag *flag_) | |
127 | { | |
128 | atomic_flag *flag = CONST_CAST(atomic_flag *, flag_); | |
129 | ||
130 | atomic_lock__(flag); | |
131 | flag->b = false; | |
132 | atomic_unlock__(flag); | |
133 | } | |
31a3fc6e | 134 | |
4dff0893 BP |
135 | static inline void |
136 | atomic_flag_clear_explicit(volatile atomic_flag *flag, | |
137 | memory_order order OVS_UNUSED) | |
138 | { | |
139 | atomic_flag_clear(flag); | |
140 | } |