155 lines
4.7 KiB
C#
155 lines
4.7 KiB
C#
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="L4.CacheLine"
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// Project: StgSharp
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// AuthorGroup: Nitload Space
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// Copyright (c) Nitload Space. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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// -----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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using StgSharp.HighPerformance.ProcessorAbstraction;
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using System.Runtime.InteropServices;
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using Tlsf = StgSharp.HighPerformance.Memory.TwoLayerSegregatedFitAllocator;
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namespace StgSharp.HighPerformance.Memory
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{
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public partial class L4
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{
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[InlineArray(CacheLineCount)]
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private struct PredictionArray
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{
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private int PredictionCount;
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}
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[InlineArray(CacheLineCount)]
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private struct MapArray
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{
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private int MapCount;
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}
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internal enum AllocationState : byte
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{
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SpareOrCollect = 0,
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Free = 1,
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Alloc = 2,
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}
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[StructLayout(LayoutKind.Explicit, Size = 64, Pack = 64)]
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private unsafe struct CacheLineMetadata
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{
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#region tlsf area
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// TLSF area use only 24 bytes
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internal const ulong Mask48Bits = 0x0000FFFFFFFFFFFF;
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[FieldOffset(0)] private readonly M512 FillingMask;
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[FieldOffset(8)] private ulong PositionMask;
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[FieldOffset(16)] private ulong SizeMask;
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[FieldOffset(14)] internal AllocationState State;
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// [FieldOffset(15)] internal sbyte Level;
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[FieldOffset(0)] public short NextLevel;
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[FieldOffset(2)] public short NextNear;
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[FieldOffset(4)] public short PreviousLevel;
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[FieldOffset(6)] public short PreviousNear;
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public Ptr64 Position
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{
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readonly get => PositionMask;
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set => PositionMask = value;
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}
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public Ptr64 SizeForAllocator
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{
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readonly get => (Ptr64)(SizeMask & Mask48Bits);
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set => SizeMask = (SizeMask & ~Mask48Bits) | ((ulong)value & Mask48Bits);
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}
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public Ptr64 SizeForSpare
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{
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readonly get => SizeMask;
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set => SizeMask = value;
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}
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public static uint SizeOf { get; } = (uint)Unsafe.SizeOf<CacheLineMetadata>();
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#endregion
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#region reference counting and state information
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[FieldOffset(24)] internal int RefCount;
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[FieldOffset(28)] internal readonly short Id;
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#endregion
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#region cache line information
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[FieldOffset(34)] internal ushort Profile;
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[FieldOffset(36)] internal nuint Origin;
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#endregion
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}
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[StructLayout(LayoutKind.Sequential)]
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public unsafe ref struct Handle : IDisposable
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{
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private CacheLineMetadata* _head;
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private nuint _handle;
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private Handle(nuint handle, CacheLineMetadata* cacheRefCount)
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{
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_handle = handle;
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_head = cacheRefCount;
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}
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[Obsolete("You should not create a CacheLineHandle instance outside a L4", true)]
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public Handle() { }
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public readonly nuint Address => _handle;
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public void Dispose()
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{
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if (_handle == 0) {
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return;
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}
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_handle = 0;
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_ = Interlocked.Decrement(ref _head->RefCount);
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}
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}
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}
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}
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