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29ab0cf7 | 1 | /* |
8917f72c | 2 | * Copyright (c) 2013, 2014 Nicira, Inc. |
29ab0cf7 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_flag on Clang and on GCC 4.7 and later. */ | |
18 | #ifndef IN_OVS_ATOMIC_H | |
19 | #error "This header should only be included indirectly via ovs-atomic.h." | |
20 | #endif | |
21 | ||
22 | /* atomic_flag */ | |
23 | ||
24 | typedef struct { | |
25 | unsigned char b; | |
26 | } atomic_flag; | |
27 | #define ATOMIC_FLAG_INIT { .b = false } | |
28 | ||
29 | static inline bool | |
30 | atomic_flag_test_and_set_explicit(volatile atomic_flag *object, | |
31 | memory_order order) | |
32 | { | |
33 | return __atomic_test_and_set(&object->b, order); | |
34 | } | |
35 | ||
36 | static inline bool | |
37 | atomic_flag_test_and_set(volatile atomic_flag *object) | |
38 | { | |
39 | return atomic_flag_test_and_set_explicit(object, memory_order_seq_cst); | |
40 | } | |
41 | ||
42 | static inline void | |
43 | atomic_flag_clear_explicit(volatile atomic_flag *object, memory_order order) | |
44 | { | |
45 | __atomic_clear(object, order); | |
46 | } | |
47 | ||
48 | static inline void | |
49 | atomic_flag_clear(volatile atomic_flag *object) | |
50 | { | |
51 | atomic_flag_clear_explicit(object, memory_order_seq_cst); | |
52 | } |