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https://github.com/openvswitch/ovs
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31a3fc6e3e
This library should prove useful for the threading changes coming up. The following commit introduces one (very simple) user. Signed-off-by: Ben Pfaff <blp@nicira.com> Acked-by: Ethan Jackson <ethan@nicira.com>
142 lines
4.7 KiB
C
142 lines
4.7 KiB
C
/*
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* Copyright (c) 2013 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* This header implements atomic operation primitives on GCC 4.7 and later. */
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#ifndef IN_OVS_ATOMIC_H
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#error "This header should only be included indirectly via ovs-atomic.h."
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#endif
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/* C11 standardized atomic type. */
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typedef bool atomic_bool;
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typedef char atomic_char;
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typedef signed char atomic_schar;
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typedef unsigned char atomic_uchar;
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typedef short atomic_short;
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typedef unsigned short atomic_ushort;
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typedef int atomic_int;
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typedef unsigned int atomic_uint;
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typedef long atomic_long;
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typedef unsigned long atomic_ulong;
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typedef long long atomic_llong;
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typedef unsigned long long atomic_ullong;
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typedef size_t atomic_size_t;
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typedef ptrdiff_t atomic_ptrdiff_t;
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typedef intmax_t atomic_intmax_t;
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typedef uintmax_t atomic_uintmax_t;
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typedef intptr_t atomic_intptr_t;
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typedef uintptr_t atomic_uintptr_t;
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/* Nonstandard atomic types. */
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typedef int8_t atomic_int8_t;
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typedef uint8_t atomic_uint8_t;
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typedef int16_t atomic_int16_t;
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typedef uint16_t atomic_uint16_t;
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typedef int32_t atomic_int32_t;
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typedef uint32_t atomic_uint32_t;
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typedef int64_t atomic_int64_t;
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typedef uint64_t atomic_uint64_t;
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typedef enum {
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memory_order_relaxed = __ATOMIC_RELAXED,
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memory_order_consume = __ATOMIC_CONSUME,
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memory_order_acquire = __ATOMIC_ACQUIRE,
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memory_order_release = __ATOMIC_RELEASE,
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memory_order_acq_rel = __ATOMIC_ACQ_REL,
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memory_order_seq_cst = __ATOMIC_SEQ_CST
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} memory_order;
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#define ATOMIC_VAR_INIT(VALUE) (VALUE)
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#define atomic_init(OBJECT, VALUE) (*(OBJECT) = (VALUE), (void) 0)
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#define atomic_thread_fence __atomic_thread_fence
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#define atomic_signal_fence __atomic_signal_fence
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#define atomic_is_lock_free __atomic_is_lock_free
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#define atomic_store(DST, SRC) \
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atomic_store_explicit(DST, SRC, memory_order_seq_cst)
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#define atomic_store_explicit __atomic_store_n
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#define atomic_read(SRC, DST) \
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atomic_read_explicit(SRC, DST, memory_order_seq_cst)
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#define atomic_read_explicit(SRC, DST, ORDER) \
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(*(DST) = __atomic_load_n(SRC, ORDER), \
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(void) 0)
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#define atomic_add(RMW, OPERAND, ORIG) \
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atomic_add_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
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#define atomic_sub(RMW, OPERAND, ORIG) \
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atomic_sub_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
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#define atomic_or(RMW, OPERAND, ORIG) \
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atomic_or_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
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#define atomic_xor(RMW, OPERAND, ORIG) \
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atomic_xor_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
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#define atomic_and(RMW, OPERAND, ORIG) \
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atomic_and_explicit(RMW, OPERAND, ORIG, memory_order_seq_cst)
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#define atomic_add_explicit(RMW, OPERAND, ORIG, ORDER) \
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(*(ORIG) = __atomic_fetch_add(RMW, OPERAND, ORDER), (void) 0)
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#define atomic_sub_explicit(RMW, OPERAND, ORIG, ORDER) \
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(*(ORIG) = __atomic_fetch_sub(RMW, OPERAND, ORDER), (void) 0)
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#define atomic_or_explicit(RMW, OPERAND, ORIG, ORDER) \
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(*(ORIG) = __atomic_fetch_or(RMW, OPERAND, ORDER), (void) 0)
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#define atomic_xor_explicit(RMW, OPERAND, ORIG, ORDER) \
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(*(ORIG) = __atomic_fetch_xor(RMW, OPERAND, ORDER), (void) 0)
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#define atomic_and_explicit(RMW, OPERAND, ORIG, ORDER) \
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(*(ORIG) = __atomic_fetch_and(RMW, OPERAND, ORDER), (void) 0)
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/* atomic_flag */
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typedef struct {
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unsigned char b;
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} atomic_flag;
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#define ATOMIC_FLAG_INIT { .b = false }
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static inline bool
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atomic_flag_test_and_set_explicit(volatile atomic_flag *object,
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memory_order order)
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{
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return __atomic_test_and_set(&object->b, order);
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}
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static inline bool
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atomic_flag_test_and_set(volatile atomic_flag *object)
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{
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return atomic_flag_test_and_set_explicit(object, memory_order_seq_cst);
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}
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static inline void
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atomic_flag_clear_explicit(volatile atomic_flag *object, memory_order order)
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{
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__atomic_clear(object, order);
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}
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static inline void
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atomic_flag_clear(volatile atomic_flag *object)
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{
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atomic_flag_clear_explicit(object, memory_order_seq_cst);
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}
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