122 lines
4.4 KiB
C#
122 lines
4.4 KiB
C#
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="HLSFAllocator.cs"
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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
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// obtaining a copy of this software and associated documentation
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// files (the “Software”), to deal in the Software without restriction,
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// including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software,
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// and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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//
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// The above copyright notice and
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// this permission notice shall be included in all copies
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// or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED “AS IS”,
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// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH
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// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 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.Buffers;
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using System.Runtime.InteropServices;
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namespace StgSharp.HighPerformance.Memory
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{
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public unsafe partial class HybridLayerSegregatedFitAllocator : IDisposable
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{
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private static readonly nuint EmptyHandle = (nuint)(void*)null;
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// Bucket system field - directly in main allocator class
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private ulong[] _bucketHeads;
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private Entry* _spareMemory;
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private readonly byte* m_Buffer;
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private bool disposedValue;
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private readonly int _align;
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private readonly nuint _size;
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private readonly SlabAllocator<Entry> _entries;
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public HybridLayerSegregatedFitAllocator(nuint byteSize)
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{
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if (byteSize < 64) {
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throw new InvalidOperationException();
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}
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_entries = SlabAllocator<Entry>.Create(64, SlabBufferLayout.Chunked, false);
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_size = byteSize;
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m_Buffer = (byte*)NativeMemory.AlignedAlloc(byteSize, 16);
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_align = 16;
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InitializeBucketSystem();
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_spareMemory = (Entry*)_entries.Allocate();
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_spareMemory->State = EntryState.Empty;
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_spareMemory->PreviousNear = EmptyHandle;
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_spareMemory->NextNear = EmptyHandle;
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_spareMemory->Position = (nuint)m_Buffer;
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_spareMemory->PrevLock = 0;
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_spareMemory->NextLock = 0;
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_spareMemory->Size = (uint)byteSize;
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}
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public HybridLayerSegregatedFitAllocator(nuint byteSize, int align)
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{
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if (align < 16 || (align & (align - 1)) != 0) {
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throw new ArgumentException(
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"Alignment must be a power of two and at least 8 bytes.");
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}
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_entries = SlabAllocator<Entry>.Create(64, SlabBufferLayout.Chunked);
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m_Buffer = (byte*)NativeMemory.AlignedAlloc(byteSize, (nuint)align);
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_align = align;
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_size = byteSize;
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InitializeBucketSystem();
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_spareMemory = (Entry*)_entries.Allocate();
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_spareMemory->State = EntryState.Empty;
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_spareMemory->PreviousNear = EmptyHandle;
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_spareMemory->NextNear = EmptyHandle;
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_spareMemory->Position = (nuint)m_Buffer;
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_spareMemory->PrevLock = 0;
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_spareMemory->NextLock = 0;
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_spareMemory->Size = (uint)byteSize;
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}
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public void Dispose()
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{
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Dispose(disposing:true);
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GC.SuppressFinalize(this);
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}
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protected virtual void Dispose(bool disposing)
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{
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if (!disposedValue)
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{
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if (disposing) {
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_entries.Dispose();
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}
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NativeMemory.AlignedFree(m_Buffer);
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disposedValue = true;
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}
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}
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~HybridLayerSegregatedFitAllocator()
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{
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Dispose(disposing:false);
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}
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}
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}
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