lib/ovs-atomic-clang.h

   1 /*
   2  * Copyright (c) 2013, 2014 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 Clang. */
  18 #ifndef IN_OVS_ATOMIC_H
  19 #error "This header should only be included indirectly via ovs-atomic.h."
  20 #endif
  21
  22 #define OVS_ATOMIC_CLANG_IMPL 1
  23
  24 #define ATOMIC(TYPE) _Atomic(TYPE)
  25
  26 #define ATOMIC_VAR_INIT(VALUE) (VALUE)
  27
  28 #define atomic_init(OBJECT, VALUE) __c11_atomic_init(OBJECT, VALUE)
  29
  30 /* Clang hard-codes these exact values internally but does not appear to
  31  * export any names for them. */
  32 typedef enum {
  33     memory_order_relaxed = 0,
  34     memory_order_consume = 1,
  35     memory_order_acquire = 2,
  36     memory_order_release = 3,
  37     memory_order_acq_rel = 4,
  38     memory_order_seq_cst = 5
  39 } memory_order;
  40
  41 #define atomic_thread_fence(ORDER) __c11_atomic_thread_fence(ORDER)
  42 #define atomic_signal_fence(ORDER) __c11_atomic_signal_fence(ORDER)
  43
  44 #define atomic_store(DST, SRC) \
  45     atomic_store_explicit(DST, SRC, memory_order_seq_cst)
  46 #define atomic_store_explicit(DST, SRC, ORDER) \
  47     __c11_atomic_store(DST, SRC, ORDER)
  48
  49
  50 #define atomic_read(SRC, DST) \
  51     atomic_read_explicit(SRC, DST, memory_order_seq_cst)
  52 #define atomic_read_explicit(SRC, DST, ORDER)   \
  53     (*(DST) = __c11_atomic_load(SRC, ORDER), \
  54      (void) 0)
  55
  56 #define atomic_compare_exchange_strong(DST, EXP, SRC)                   \
  57     atomic_compare_exchange_strong_explicit(DST, EXP, SRC,              \
  58                                             memory_order_seq_cst,       \
  59                                             memory_order_seq_cst)
  60 #define atomic_compare_exchange_strong_explicit(DST, EXP, SRC, ORD1, ORD2) \
  61     __c11_atomic_compare_exchange_strong(DST, EXP, SRC, ORD1, ORD2)
  62
  63 #define atomic_compare_exchange_weak(DST, EXP, SRC)              \
  64     atomic_compare_exchange_weak_explicit(DST, EXP, SRC,         \
  65                                           memory_order_seq_cst,  \
  66                                           memory_order_seq_cst)
  67 #define atomic_compare_exchange_weak_explicit(DST, EXP, SRC, ORD1, ORD2) \
  68     __c11_atomic_compare_exchange_weak(DST, EXP, SRC, ORD1, ORD2)
  69
  70 #define atomic_add(RMW, ARG, ORIG) \
  71     atomic_add_explicit(RMW, ARG, ORIG, memory_order_seq_cst)
  72 #define atomic_sub(RMW, ARG, ORIG) \
  73     atomic_sub_explicit(RMW, ARG, ORIG, memory_order_seq_cst)
  74 #define atomic_or(RMW, ARG, ORIG) \
  75     atomic_or_explicit(RMW, ARG, ORIG, memory_order_seq_cst)
  76 #define atomic_xor(RMW, ARG, ORIG) \
  77     atomic_xor_explicit(RMW, ARG, ORIG, memory_order_seq_cst)
  78 #define atomic_and(RMW, ARG, ORIG) \
  79     atomic_and_explicit(RMW, ARG, ORIG, memory_order_seq_cst)
  80
  81 #define atomic_add_explicit(RMW, ARG, ORIG, ORDER) \
  82     (*(ORIG) = __c11_atomic_fetch_add(RMW, ARG, ORDER), (void) 0)
  83 #define atomic_sub_explicit(RMW, ARG, ORIG, ORDER) \
  84     (*(ORIG) = __c11_atomic_fetch_sub(RMW, ARG, ORDER), (void) 0)
  85 #define atomic_or_explicit(RMW, ARG, ORIG, ORDER) \
  86     (*(ORIG) = __c11_atomic_fetch_or(RMW, ARG, ORDER), (void) 0)
  87 #define atomic_xor_explicit(RMW, ARG, ORIG, ORDER) \
  88     (*(ORIG) = __c11_atomic_fetch_xor(RMW, ARG, ORDER), (void) 0)
  89 #define atomic_and_explicit(RMW, ARG, ORIG, ORDER) \
  90     (*(ORIG) = __c11_atomic_fetch_and(RMW, ARG, ORDER), (void) 0)
  91
  92 #include "ovs-atomic-flag-gcc4.7+.h"