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/*
* Copyright (c) 2013 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* This header implements atomic operation primitives on GCC 4.7 and later. */
#ifndef IN_OVS_ATOMIC_H
#error "This header should only be included indirectly via ovs-atomic.h."
#endif
/* C11 standardized atomic type. */
typedef bool atomic_bool;
typedef char atomic_char;
typedef signed char atomic_schar;
typedef unsigned char atomic_uchar;
typedef short atomic_short;
typedef unsigned short atomic_ushort;
typedef int atomic_int;
typedef unsigned int atomic_uint;
typedef long atomic_long;
typedef unsigned long atomic_ulong;
typedef long long atomic_llong;
typedef unsigned long long atomic_ullong;
typedef size_t atomic_size_t;
typedef ptrdiff_t atomic_ptrdiff_t;
typedef intmax_t atomic_intmax_t;
typedef uintmax_t atomic_uintmax_t;
typedef intptr_t atomic_intptr_t;
typedef uintptr_t atomic_uintptr_t;
/* Nonstandard atomic types. */
typedef int8_t atomic_int8_t;
typedef uint8_t atomic_uint8_t;
typedef int16_t atomic_int16_t;
typedef uint16_t atomic_uint16_t;
typedef int32_t atomic_int32_t;
typedef uint32_t atomic_uint32_t;
typedef int64_t atomic_int64_t;
typedef uint64_t atomic_uint64_t;
typedef enum {
memory_order_relaxed = __ATOMIC_RELAXED,
memory_order_consume = __ATOMIC_CONSUME,
memory_order_acquire = __ATOMIC_ACQUIRE,
memory_order_release = __ATOMIC_RELEASE,
memory_order_acq_rel = __ATOMIC_ACQ_REL,
memory_order_seq_cst = __ATOMIC_SEQ_CST
} memory_order;
#define ATOMIC_VAR_INIT(VALUE) (VALUE)
#define atomic_init(OBJECT, VALUE) (*(OBJECT) = (VALUE), (void) 0)
#define atomic_thread_fence __atomic_thread_fence
#define atomic_signal_fence __atomic_signal_fence
#define atomic_is_lock_free __atomic_is_lock_free
#define atomic_store(DST, SRC) \
atomic_store_explicit(DST, SRC, memory_order_seq_cst)
#define atomic_store_explicit __atomic_store_n
#define atomic_read(SRC, DST) \
atomic_read_explicit(SRC, DST, memory_order_seq_cst)
#define atomic_read_explicit(SRC, DST, ORDER) \
(*(DST) = __atomic_load_n(SRC, ORDER), \
(void) 0)
#define atomic_add(RMW, OPERAND, ORIG) \
atomic_add_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
#define atomic_sub(RMW, OPERAND, ORIG) \
atomic_sub_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
#define atomic_or(RMW, OPERAND, ORIG) \
atomic_or_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
#define atomic_xor(RMW, OPERAND, ORIG) \
atomic_xor_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
#define atomic_and(RMW, OPERAND, ORIG) \
atomic_and_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
#define atomic_add_explicit(RMW, OPERAND, ORIG, ORDER) \
(*(ORIG) = __atomic_fetch_add(RMW, OPERAND, ORDER), (void) 0)
#define atomic_sub_explicit(RMW, OPERAND, ORIG, ORDER) \
(*(ORIG) = __atomic_fetch_sub(RMW, OPERAND, ORDER), (void) 0)
#define atomic_or_explicit(RMW, OPERAND, ORIG, ORDER) \
(*(ORIG) = __atomic_fetch_or(RMW, OPERAND, ORDER), (void) 0)
#define atomic_xor_explicit(RMW, OPERAND, ORIG, ORDER) \
(*(ORIG) = __atomic_fetch_xor(RMW, OPERAND, ORDER), (void) 0)
#define atomic_and_explicit(RMW, OPERAND, ORIG, ORDER) \
(*(ORIG) = __atomic_fetch_and(RMW, OPERAND, ORDER), (void) 0)
/* atomic_flag */
typedef struct {
unsigned char b;
} atomic_flag;
#define ATOMIC_FLAG_INIT { .b = false }
static inline bool
atomic_flag_test_and_set_explicit(volatile atomic_flag *object,
memory_order order)
{
return __atomic_test_and_set(&object->b, order);
}
static inline bool
atomic_flag_test_and_set(volatile atomic_flag *object)
{
return atomic_flag_test_and_set_explicit(object, memory_order_seq_cst);
}
static inline void
atomic_flag_clear_explicit(volatile atomic_flag *object, memory_order order)
{
__atomic_clear(object, order);
}
static inline void
atomic_flag_clear(volatile atomic_flag *object)
{
atomic_flag_clear_explicit(object, memory_order_seq_cst);
}
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