lib/ovs-atomic-gcc4.7+.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 GCC 4.7 and later. */
  18 #ifndef IN_OVS_ATOMIC_H
  19 #error "This header should only be included indirectly via ovs-atomic.h."
  20 #endif
  21
  22 #define ATOMIC(TYPE) TYPE
  23
  24 typedef enum {
  25     memory_order_relaxed = __ATOMIC_RELAXED,
  26     memory_order_consume = __ATOMIC_CONSUME,
  27     memory_order_acquire = __ATOMIC_ACQUIRE,
  28     memory_order_release = __ATOMIC_RELEASE,
  29     memory_order_acq_rel = __ATOMIC_ACQ_REL,
  30     memory_order_seq_cst = __ATOMIC_SEQ_CST
  31 } memory_order;
  32
  33 #define ATOMIC_VAR_INIT(VALUE) (VALUE)
  34 #define atomic_init(OBJECT, VALUE) (*(OBJECT) = (VALUE), (void) 0)
  35
  36 #define atomic_thread_fence __atomic_thread_fence
  37 #define atomic_signal_fence __atomic_signal_fence
  38 #define atomic_is_lock_free __atomic_is_lock_free
  39
  40 #define atomic_store(DST, SRC) \
  41     atomic_store_explicit(DST, SRC, memory_order_seq_cst)
  42 #define atomic_store_explicit __atomic_store_n
  43
  44 #define atomic_read(SRC, DST) \
  45     atomic_read_explicit(SRC, DST, memory_order_seq_cst)
  46 #define atomic_read_explicit(SRC, DST, ORDER)   \
  47     (*(DST) = __atomic_load_n(SRC, ORDER),      \
  48      (void) 0)
  49
  50 #define atomic_add(RMW, OPERAND, ORIG) \
  51         atomic_add_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
  52 #define atomic_sub(RMW, OPERAND, ORIG) \
  53         atomic_sub_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
  54 #define atomic_or(RMW, OPERAND, ORIG) \
  55         atomic_or_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
  56 #define atomic_xor(RMW, OPERAND, ORIG) \
  57         atomic_xor_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
  58 #define atomic_and(RMW, OPERAND, ORIG) \
  59         atomic_and_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
  60
  61 #define atomic_add_explicit(RMW, OPERAND, ORIG, ORDER)  \
  62     (*(ORIG) = __atomic_fetch_add(RMW, OPERAND, ORDER), (void) 0)
  63 #define atomic_sub_explicit(RMW, OPERAND, ORIG, ORDER)  \
  64     (*(ORIG) = __atomic_fetch_sub(RMW, OPERAND, ORDER), (void) 0)
  65 #define atomic_or_explicit(RMW, OPERAND, ORIG, ORDER)  \
  66     (*(ORIG) = __atomic_fetch_or(RMW, OPERAND, ORDER), (void) 0)
  67 #define atomic_xor_explicit(RMW, OPERAND, ORIG, ORDER)  \
  68     (*(ORIG) = __atomic_fetch_xor(RMW, OPERAND, ORDER), (void) 0)
  69 #define atomic_and_explicit(RMW, OPERAND, ORIG, ORDER)  \
  70     (*(ORIG) = __atomic_fetch_and(RMW, OPERAND, ORDER), (void) 0)
  71
  72 #include "ovs-atomic-flag-gcc4.7+.h"