103 lines
3.5 KiB
C#
103 lines
3.5 KiB
C#
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="L4.Slab"
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// Project: StgSharp
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// AuthorGroup: Nitload
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// Copyright (c) Nitload. 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 System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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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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private sealed unsafe class Slab : SlabAllocator<Tlsf.Metadata>
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{
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private const int Capacity = L4.CacheLineCount;
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private int _maxUnused;
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private int _recycleCount;
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internal readonly CacheLineHead* _basePtr;
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internal readonly int* _indexReuse;
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public Slab(
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nuint ptr
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)
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{
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_basePtr = (CacheLineHead*)ptr;
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_indexReuse = (int*)(_basePtr + Capacity);
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_maxUnused = 0;
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_recycleCount = 0;
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}
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public static nuint RequestedAllocation { get; } = ((nuint)(Unsafe.SizeOf<CacheLineHead>() + sizeof(int))) * Capacity;
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public override nuint Allocate()
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{
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if (_recycleCount > 0) {
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return (nuint)(_basePtr + _indexReuse[_recycleCount - 1]);
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}
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if (_maxUnused >= Capacity) {
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throw new OverflowException("Slab is full");
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}
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int index = _maxUnused;
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_maxUnused++;
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return (nuint)(_basePtr + index);
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}
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public override void Dispose()
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{
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GC.SuppressFinalize(this);
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}
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public override void EnterBufferReading() { }
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public override void ExitBufferReading() { }
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public override void Free(
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nuint index
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)
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{
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_indexReuse[_recycleCount] = (int)index;
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_recycleCount++;
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}
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public override SlabAllocationHandle<Tlsf.Metadata> ReadAllocation()
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{
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return new(this, false);
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}
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}
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}
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}
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