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https://github.com/openvswitch/ovs
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25045d755e
Add support for atomic compare_exchange operations. Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com> Acked-by: Ben Pfaff <blp@nicira.com>
93 lines
3.7 KiB
C
93 lines
3.7 KiB
C
/*
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* Copyright (c) 2013, 2014 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 Clang. */
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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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#define OVS_ATOMIC_CLANG_IMPL 1
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#define ATOMIC(TYPE) _Atomic(TYPE)
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#define ATOMIC_VAR_INIT(VALUE) (VALUE)
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#define atomic_init(OBJECT, VALUE) __c11_atomic_init(OBJECT, VALUE)
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/* Clang hard-codes these exact values internally but does not appear to
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* export any names for them. */
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typedef enum {
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memory_order_relaxed = 0,
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memory_order_consume = 1,
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memory_order_acquire = 2,
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memory_order_release = 3,
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memory_order_acq_rel = 4,
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memory_order_seq_cst = 5
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} memory_order;
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#define atomic_thread_fence(ORDER) __c11_atomic_thread_fence(ORDER)
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#define atomic_signal_fence(ORDER) __c11_atomic_signal_fence(ORDER)
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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(DST, SRC, ORDER) \
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__c11_atomic_store(DST, SRC, ORDER)
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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) = __c11_atomic_load(SRC, ORDER), \
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(void) 0)
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#define atomic_compare_exchange_strong(DST, EXP, SRC) \
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atomic_compare_exchange_strong_explicit(DST, EXP, SRC, \
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memory_order_seq_cst, \
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memory_order_seq_cst)
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#define atomic_compare_exchange_strong_explicit(DST, EXP, SRC, ORD1, ORD2) \
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__c11_atomic_compare_exchange_strong(DST, EXP, SRC, ORD1, ORD2)
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#define atomic_compare_exchange_weak(DST, EXP, SRC) \
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atomic_compare_exchange_weak_explicit(DST, EXP, SRC, \
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memory_order_seq_cst, \
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memory_order_seq_cst)
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#define atomic_compare_exchange_weak_explicit(DST, EXP, SRC, ORD1, ORD2) \
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__c11_atomic_compare_exchange_weak(DST, EXP, SRC, ORD1, ORD2)
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#define atomic_add(RMW, ARG, ORIG) \
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atomic_add_explicit(RMW, ARG, ORIG, memory_order_seq_cst)
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#define atomic_sub(RMW, ARG, ORIG) \
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atomic_sub_explicit(RMW, ARG, ORIG, memory_order_seq_cst)
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#define atomic_or(RMW, ARG, ORIG) \
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atomic_or_explicit(RMW, ARG, ORIG, memory_order_seq_cst)
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#define atomic_xor(RMW, ARG, ORIG) \
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atomic_xor_explicit(RMW, ARG, ORIG, memory_order_seq_cst)
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#define atomic_and(RMW, ARG, ORIG) \
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atomic_and_explicit(RMW, ARG, ORIG, memory_order_seq_cst)
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#define atomic_add_explicit(RMW, ARG, ORIG, ORDER) \
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(*(ORIG) = __c11_atomic_fetch_add(RMW, ARG, ORDER), (void) 0)
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#define atomic_sub_explicit(RMW, ARG, ORIG, ORDER) \
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(*(ORIG) = __c11_atomic_fetch_sub(RMW, ARG, ORDER), (void) 0)
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#define atomic_or_explicit(RMW, ARG, ORIG, ORDER) \
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(*(ORIG) = __c11_atomic_fetch_or(RMW, ARG, ORDER), (void) 0)
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#define atomic_xor_explicit(RMW, ARG, ORIG, ORDER) \
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(*(ORIG) = __c11_atomic_fetch_xor(RMW, ARG, ORDER), (void) 0)
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#define atomic_and_explicit(RMW, ARG, ORIG, ORDER) \
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(*(ORIG) = __c11_atomic_fetch_and(RMW, ARG, ORDER), (void) 0)
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#include "ovs-atomic-flag-gcc4.7+.h"
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