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)
47 #define atomic_destroy(OBJECT) ((void) (OBJECT))
50 atomic_thread_fence(memory_order order OVS_UNUSED)
56 atomic_signal_fence(memory_order order OVS_UNUSED)
61 #define atomic_is_lock_free(OBJ) false
63 #define atomic_store(DST, SRC) atomic_store_locked(DST, SRC)
64 #define atomic_store_explicit(DST, SRC, ORDER) \
65 ((void) (ORDER), atomic_store(DST, SRC))
67 #define atomic_read(SRC, DST) atomic_read_locked(SRC, DST)
68 #define atomic_read_explicit(SRC, DST, ORDER) \
69 ((void) (ORDER), atomic_read(SRC, DST))
71 #define atomic_add(RMW, ARG, ORIG) atomic_op_locked(RMW, add, ARG, ORIG)
72 #define atomic_sub(RMW, ARG, ORIG) atomic_op_locked(RMW, sub, ARG, ORIG)
73 #define atomic_or( RMW, ARG, ORIG) atomic_op_locked(RMW, or, ARG, ORIG)
74 #define atomic_xor(RMW, ARG, ORIG) atomic_op_locked(RMW, xor, ARG, ORIG)
75 #define atomic_and(RMW, ARG, ORIG) atomic_op_locked(RMW, and, ARG, ORIG)
77 #define atomic_add_explicit(RMW, ARG, ORIG, ORDER) \
78 ((void) (ORDER), atomic_add(RMW, ARG, ORIG))
79 #define atomic_sub_explicit(RMW, ARG, ORIG, ORDER) \
80 ((void) (ORDER), atomic_sub(RMW, ARG, ORIG))
81 #define atomic_or_explicit(RMW, ARG, ORIG, ORDER) \
82 ((void) (ORDER), atomic_or(RMW, ARG, ORIG))
83 #define atomic_xor_explicit(RMW, ARG, ORIG, ORDER) \
84 ((void) (ORDER), atomic_xor(RMW, ARG, ORIG))
85 #define atomic_and_explicit(RMW, ARG, ORIG, ORDER) \
86 ((void) (ORDER), atomic_and(RMW, ARG, ORIG))
93 #define ATOMIC_FLAG_INIT { false }
96 atomic_flag_init(volatile atomic_flag *flag OVS_UNUSED)
102 atomic_flag_destroy(volatile atomic_flag *flag OVS_UNUSED)
108 atomic_flag_test_and_set(volatile atomic_flag *flag_)
110 atomic_flag *flag = CONST_CAST(atomic_flag *, flag_);
116 atomic_unlock__(flag);
122 atomic_flag_test_and_set_explicit(volatile atomic_flag *flag,
123 memory_order order OVS_UNUSED)
125 return atomic_flag_test_and_set(flag);
129 atomic_flag_clear(volatile atomic_flag *flag_)
131 atomic_flag *flag = CONST_CAST(atomic_flag *, flag_);
135 atomic_unlock__(flag);
139 atomic_flag_clear_explicit(volatile atomic_flag *flag,
140 memory_order order OVS_UNUSED)
142 atomic_flag_clear(flag);