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58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
/*
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* Copyright 2016 Facebook, 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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#pragma once
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#include <folly/detail/CacheLocality.h>
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namespace folly {
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template <typename T>
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class CachelinePadded;
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namespace detail {
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template <
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typename T,
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bool needsPadding = (sizeof(T) % CacheLocality::kFalseSharingRange != 0)>
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struct CachelinePaddedImpl;
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// We need alignas(T) alignas(kFalseSharingRange) for the case where alignof(T)
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// > alignof(kFalseSharingRange).
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template <typename T>
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struct alignas(T) alignas(detail::CacheLocality::kFalseSharingRange)
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CachelinePaddedImpl<T, /* needsPadding = */ false> {
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template <typename... Args>
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explicit CachelinePaddedImpl(Args&&... args)
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: item(std::forward<Args>(args)...) {}
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T item;
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};
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template <typename T>
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struct alignas(T) alignas(detail::CacheLocality::kFalseSharingRange)
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CachelinePaddedImpl<T, /* needsPadding = */ true> {
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template <typename... Args>
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explicit CachelinePaddedImpl(Args&&... args)
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: item(std::forward<Args>(args)...) {}
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T item;
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char padding
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[CacheLocality::kFalseSharingRange -
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sizeof(T) % CacheLocality::kFalseSharingRange];
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};
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} // namespace detail
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} // namespace folly
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