lib/ovs-atomic-gcc4.7+.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 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 /* C11 standardized atomic type. */
  23 typedef bool               atomic_bool;
  24
  25 typedef char               atomic_char;
  26 typedef signed char        atomic_schar;
  27 typedef unsigned char      atomic_uchar;
  28
  29 typedef short              atomic_short;
  30 typedef unsigned short     atomic_ushort;
  31
  32 typedef int                atomic_int;
  33 typedef unsigned int       atomic_uint;
  34
  35 typedef long               atomic_long;
  36 typedef unsigned long      atomic_ulong;
  37
  38 typedef long long          atomic_llong;
  39 typedef unsigned long long atomic_ullong;
  40
  41 typedef size_t             atomic_size_t;
  42 typedef ptrdiff_t          atomic_ptrdiff_t;
  43
  44 typedef intmax_t           atomic_intmax_t;
  45 typedef uintmax_t          atomic_uintmax_t;
  46
  47 typedef intptr_t           atomic_intptr_t;
  48 typedef uintptr_t          atomic_uintptr_t;
  49
  50 /* Nonstandard atomic types. */
  51 typedef int8_t             atomic_int8_t;
  52 typedef uint8_t            atomic_uint8_t;
  53
  54 typedef int16_t            atomic_int16_t;
  55 typedef uint16_t           atomic_uint16_t;
  56
  57 typedef int32_t            atomic_int32_t;
  58 typedef uint32_t           atomic_uint32_t;
  59
  60 typedef int64_t            atomic_int64_t;
  61 typedef uint64_t           atomic_uint64_t;
  62
  63 typedef enum {
  64     memory_order_relaxed = __ATOMIC_RELAXED,
  65     memory_order_consume = __ATOMIC_CONSUME,
  66     memory_order_acquire = __ATOMIC_ACQUIRE,
  67     memory_order_release = __ATOMIC_RELEASE,
  68     memory_order_acq_rel = __ATOMIC_ACQ_REL,
  69     memory_order_seq_cst = __ATOMIC_SEQ_CST
  70 } memory_order;
  71
  72 #define ATOMIC_VAR_INIT(VALUE) (VALUE)
  73 #define atomic_init(OBJECT, VALUE) (*(OBJECT) = (VALUE), (void) 0)
  74
  75 #define atomic_thread_fence __atomic_thread_fence
  76 #define atomic_signal_fence __atomic_signal_fence
  77 #define atomic_is_lock_free __atomic_is_lock_free
  78
  79 #define atomic_store(DST, SRC) \
  80     atomic_store_explicit(DST, SRC, memory_order_seq_cst)
  81 #define atomic_store_explicit __atomic_store_n
  82
  83 #define atomic_read(SRC, DST) \
  84     atomic_read_explicit(SRC, DST, memory_order_seq_cst)
  85 #define atomic_read_explicit(SRC, DST, ORDER)   \
  86     (*(DST) = __atomic_load_n(SRC, ORDER),      \
  87      (void) 0)
  88
  89 #define atomic_add(RMW, OPERAND, ORIG) \
  90         atomic_add_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
  91 #define atomic_sub(RMW, OPERAND, ORIG) \
  92         atomic_sub_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
  93 #define atomic_or(RMW, OPERAND, ORIG) \
  94         atomic_or_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
  95 #define atomic_xor(RMW, OPERAND, ORIG) \
  96         atomic_xor_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
  97 #define atomic_and(RMW, OPERAND, ORIG) \
  98         atomic_and_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
  99
 100 #define atomic_add_explicit(RMW, OPERAND, ORIG, ORDER)  \
 101     (*(ORIG) = __atomic_fetch_add(RMW, OPERAND, ORDER), (void) 0)
 102 #define atomic_sub_explicit(RMW, OPERAND, ORIG, ORDER)  \
 103     (*(ORIG) = __atomic_fetch_sub(RMW, OPERAND, ORDER), (void) 0)
 104 #define atomic_or_explicit(RMW, OPERAND, ORIG, ORDER)  \
 105     (*(ORIG) = __atomic_fetch_or(RMW, OPERAND, ORDER), (void) 0)
 106 #define atomic_xor_explicit(RMW, OPERAND, ORIG, ORDER)  \
 107     (*(ORIG) = __atomic_fetch_xor(RMW, OPERAND, ORDER), (void) 0)
 108 #define atomic_and_explicit(RMW, OPERAND, ORIG, ORDER)  \
 109     (*(ORIG) = __atomic_fetch_and(RMW, OPERAND, ORDER), (void) 0)
 110 \f
 111 /* atomic_flag */
 112
 113 typedef struct {
 114     unsigned char b;
 115 } atomic_flag;
 116 #define ATOMIC_FLAG_INIT { .b = false }
 117
 118 static inline bool
 119 atomic_flag_test_and_set_explicit(volatile atomic_flag *object,
 120                                   memory_order order)
 121 {
 122     return __atomic_test_and_set(&object->b, order);
 123 }
 124
 125 static inline bool
 126 atomic_flag_test_and_set(volatile atomic_flag *object)
 127 {
 128     return atomic_flag_test_and_set_explicit(object, memory_order_seq_cst);
 129 }
 130
 131 static inline void
 132 atomic_flag_clear_explicit(volatile atomic_flag *object, memory_order order)
 133 {
 134     __atomic_clear(object, order);
 135 }
 136
 137 static inline void
 138 atomic_flag_clear(volatile atomic_flag *object)
 139 {
 140     atomic_flag_clear_explicit(object, memory_order_seq_cst);
 141 }