lib/ovs-atomic-c11.h

   1 /*
   2  * Copyright (c) 2013 Nicira, Inc.
   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 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."
  21 #endif
  22
  23 #include <stdatomic.h>
  24
  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;
  30
  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;
  35
  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), \
  40      (void) 0)
  41
  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)
  52
  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)