2 * Copyright (c) 2013 Nicira, Inc.
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:
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 /* This header implements atomic operation primitives on compilers that
18 * have built-in support for C11 <stdatomic.h> */
19 #ifndef IN_OVS_ATOMIC_H
20 #error "This header should only be included indirectly via ovs-atomic.h."
23 #include <stdatomic.h>
25 /* Nonstandard atomic types. */
26 typedef _Atomic(uint8_t) atomic_uint8_t;
27 typedef _Atomic(uint16_t) atomic_uint16_t;
28 typedef _Atomic(uint32_t) atomic_uint32_t;
29 typedef _Atomic(uint64_t) atomic_uint64_t;
31 typedef _Atomic(int8_t) atomic_int8_t;
32 typedef _Atomic(int16_t) atomic_int16_t;
33 typedef _Atomic(int32_t) atomic_int32_t;
34 typedef _Atomic(int64_t) atomic_int64_t;
36 #define atomic_read(SRC, DST) \
37 atomic_read_explicit(SRC, DST, memory_order_seq_cst)
38 #define atomic_read_explicit(SRC, DST, ORDER) \
39 (*(DST) = atomic_load_explicit(SRC, ORDER), \
42 #define atomic_add(RMW, ARG, ORIG) \
43 atomic_add_explicit(RMW, ARG, ORIG, memory_order_seq_cst)
44 #define atomic_sub(RMW, ARG, ORIG) \
45 atomic_sub_explicit(RMW, ARG, ORIG, memory_order_seq_cst)
46 #define atomic_or(RMW, ARG, ORIG) \
47 atomic_or_explicit(RMW, ARG, ORIG, memory_order_seq_cst)
48 #define atomic_xor(RMW, ARG, ORIG) \
49 atomic_xor_explicit(RMW, ARG, ORIG, memory_order_seq_cst)
50 #define atomic_and(RMW, ARG, ORIG) \
51 atomic_and_explicit(RMW, ARG, ORIG, memory_order_seq_cst)
53 #define atomic_add_explicit(RMW, ARG, ORIG, ORDER) \
54 (*(ORIG) = atomic_fetch_add_explicit(RMW, ARG, ORDER), (void) 0)
55 #define atomic_sub_explicit(RMW, ARG, ORIG, ORDER) \
56 (*(ORIG) = atomic_fetch_sub_explicit(RMW, ARG, ORDER), (void) 0)
57 #define atomic_or_explicit(RMW, ARG, ORIG, ORDER) \
58 (*(ORIG) = atomic_fetch_or_explicit(RMW, ARG, ORDER), (void) 0)
59 #define atomic_xor_explicit(RMW, ARG, ORIG, ORDER) \
60 (*(ORIG) = atomic_fetch_xor_explicit(RMW, ARG, ORDER), (void) 0)
61 #define atomic_and_explicit(RMW, ARG, ORIG, ORDER) \
62 (*(ORIG) = atomic_fetch_and_explicit(RMW, ARG, ORDER), (void) 0)
65 atomic_flag_init(volatile atomic_flag *object OVS_UNUSED)
71 atomic_flag_destroy(volatile atomic_flag *object OVS_UNUSED)