38 lines
1.4 KiB
C#
38 lines
1.4 KiB
C#
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// Copyright (c) Microsoft. All rights reserved.
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// Licensed under the MIT license. See LICENSE file in the project root for full license information.
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// =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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//
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// Padding.cs
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//
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//
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// Helper structs for padding over CPU cache lines to avoid false sharing.
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//
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// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
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using System.Runtime.InteropServices;
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namespace System.Threading.Tasks.Dataflow.Internal
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{
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/// <summary>A placeholder class for common padding constants and eventually routines.</summary>
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internal static class Padding
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{
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/// <summary>A size greater than or equal to the size of the most common CPU cache lines.</summary>
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internal const int CACHE_LINE_SIZE = 128;
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}
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/// <summary>Padding structure used to minimize false sharing in SingleProducerSingleConsumerQueue{T}.</summary>
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[StructLayout(LayoutKind.Explicit, Size = Padding.CACHE_LINE_SIZE - sizeof(Int32))] // Based on common case of 64-byte cache lines
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internal struct PaddingForInt32
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{
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}
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/// <summary>Value type that contains single Int64 value padded on both sides.</summary>
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[StructLayout(LayoutKind.Explicit, Size = 2 * Padding.CACHE_LINE_SIZE)]
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internal struct PaddedInt64
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{
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[FieldOffset(Padding.CACHE_LINE_SIZE)]
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internal Int64 Value;
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}
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}
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