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https://github.com/openvswitch/ovs
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5878b92522
The atomic exchange operation is a useful primitive that should be available as well. Most compilers already expose or offer a way to use it, but a single symbol needs to be defined. Signed-off-by: Gaetan Rivet <grive@u256.net> Reviewed-by: Eli Britstein <elibr@nvidia.com> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com> Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
/* This header implements atomic operation primitives on compilers that
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* have built-in support for ++C11 <atomic> */
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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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#include <atomic>
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#define ATOMIC(TYPE) std::atomic<TYPE>
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using std::atomic_init;
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using std::memory_order_relaxed;
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using std::memory_order_consume;
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using std::memory_order_acquire;
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using std::memory_order_release;
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using std::memory_order_acq_rel;
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using std::memory_order_seq_cst;
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using std::atomic_thread_fence;
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using std::atomic_signal_fence;
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using std::atomic_is_lock_free;
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using std::atomic_store;
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using std::atomic_store_explicit;
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using std::atomic_compare_exchange_strong;
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using std::atomic_compare_exchange_strong_explicit;
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using std::atomic_compare_exchange_weak;
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using std::atomic_compare_exchange_weak_explicit;
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using std::atomic_exchange;
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using std::atomic_exchange_explicit;
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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) = std::atomic_load_explicit(SRC, ORDER), \
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(void) 0)
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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) = (*(RMW)).fetch_add(ARG, ORDER), (void) 0)
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#define atomic_sub_explicit(RMW, ARG, ORIG, ORDER) \
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(*(ORIG) = (*(RMW)).fetch_sub(ARG, ORDER), (void) 0)
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#define atomic_or_explicit(RMW, ARG, ORIG, ORDER) \
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(*(ORIG) = (*(RMW)).fetch_or(ARG, ORDER), (void) 0)
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#define atomic_xor_explicit(RMW, ARG, ORIG, ORDER) \
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(*(ORIG) = (*(RMW)).fetch_xor(ARG, ORDER), (void) 0)
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#define atomic_and_explicit(RMW, ARG, ORIG, ORDER) \
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(*(ORIG) = (*(RMW)).fetch_and(ARG, ORDER), (void) 0)
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using std::atomic_flag;
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using std::atomic_flag_test_and_set_explicit;
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using std::atomic_flag_test_and_set;
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using std::atomic_flag_clear_explicit;
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using std::atomic_flag_clear;
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