2 * Copyright (c) 2013, 2014 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 using pthreads. */
18 #ifndef IN_OVS_ATOMIC_H
19 #error "This header should only be included indirectly via ovs-atomic.h."
22 #include "ovs-atomic-locked.h"
24 #define OVS_ATOMIC_PTHREADS_IMPL 1
26 #define ATOMIC(TYPE) TYPE
28 #define ATOMIC_BOOL_LOCK_FREE 0
29 #define ATOMIC_CHAR_LOCK_FREE 0
30 #define ATOMIC_SHORT_LOCK_FREE 0
31 #define ATOMIC_INT_LOCK_FREE 0
32 #define ATOMIC_LONG_LOCK_FREE 0
33 #define ATOMIC_LLONG_LOCK_FREE 0
34 #define ATOMIC_POINTER_LOCK_FREE 0
45 #define ATOMIC_VAR_INIT(VALUE) (VALUE)
46 #define atomic_init(OBJECT, VALUE) (*(OBJECT) = (VALUE), (void) 0)
49 atomic_thread_fence(memory_order order OVS_UNUSED)
55 atomic_signal_fence(memory_order order OVS_UNUSED)
60 #define atomic_is_lock_free(OBJ) false
62 #define atomic_store(DST, SRC) atomic_store_locked(DST, SRC)
63 #define atomic_store_explicit(DST, SRC, ORDER) \
64 ((void) (ORDER), atomic_store(DST, SRC))
66 #define atomic_read(SRC, DST) atomic_read_locked(SRC, DST)
67 #define atomic_read_explicit(SRC, DST, ORDER) \
68 ((void) (ORDER), atomic_read(SRC, DST))
70 #define atomic_add(RMW, ARG, ORIG) atomic_op_locked(RMW, add, ARG, ORIG)
71 #define atomic_sub(RMW, ARG, ORIG) atomic_op_locked(RMW, sub, ARG, ORIG)
72 #define atomic_or( RMW, ARG, ORIG) atomic_op_locked(RMW, or, ARG, ORIG)
73 #define atomic_xor(RMW, ARG, ORIG) atomic_op_locked(RMW, xor, ARG, ORIG)
74 #define atomic_and(RMW, ARG, ORIG) atomic_op_locked(RMW, and, ARG, ORIG)
76 #define atomic_add_explicit(RMW, ARG, ORIG, ORDER) \
77 ((void) (ORDER), atomic_add(RMW, ARG, ORIG))
78 #define atomic_sub_explicit(RMW, ARG, ORIG, ORDER) \
79 ((void) (ORDER), atomic_sub(RMW, ARG, ORIG))
80 #define atomic_or_explicit(RMW, ARG, ORIG, ORDER) \
81 ((void) (ORDER), atomic_or(RMW, ARG, ORIG))
82 #define atomic_xor_explicit(RMW, ARG, ORIG, ORDER) \
83 ((void) (ORDER), atomic_xor(RMW, ARG, ORIG))
84 #define atomic_and_explicit(RMW, ARG, ORIG, ORDER) \
85 ((void) (ORDER), atomic_and(RMW, ARG, ORIG))
92 #define ATOMIC_FLAG_INIT { false }
95 atomic_flag_test_and_set(volatile atomic_flag *flag_)
97 atomic_flag *flag = CONST_CAST(atomic_flag *, flag_);
103 atomic_unlock__(flag);
109 atomic_flag_test_and_set_explicit(volatile atomic_flag *flag,
110 memory_order order OVS_UNUSED)
112 return atomic_flag_test_and_set(flag);
116 atomic_flag_clear(volatile atomic_flag *flag_)
118 atomic_flag *flag = CONST_CAST(atomic_flag *, flag_);
122 atomic_unlock__(flag);
126 atomic_flag_clear_explicit(volatile atomic_flag *flag,
127 memory_order order OVS_UNUSED)
129 atomic_flag_clear(flag);