40 lines
1015 B
C++
40 lines
1015 B
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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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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#pragma once
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#include <atomic>
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#include <folly/portability/Asm.h>
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namespace folly {
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enum class AMBFlags {
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NORMAL,
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EXPEDITED,
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};
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FOLLY_ALWAYS_INLINE void asymmetricLightBarrier() {
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if (kIsLinux) {
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asm_volatile_memory();
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} else {
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std::atomic_thread_fence(std::memory_order_seq_cst);
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}
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}
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void asymmetricHeavyBarrier(AMBFlags flags = AMBFlags::EXPEDITED);
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} // namespace folly
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