132 lines
4.3 KiB
C#
132 lines
4.3 KiB
C#
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="SlabAllocator.Fixed"
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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 StgSharp.Collections;
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using StgSharp.Mathematics.Memory;
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using StgSharp.Threading;
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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.Runtime.InteropServices;
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using System.Text;
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using System.Threading.Tasks;
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namespace StgSharp.HighPerformance.Memory
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{
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internal unsafe class FixedSlabAllocator<T> : SlabAllocator<T> where T : unmanaged
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{
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private Action<nuint> _freeHandle;
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private bool _disposed;
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private CapacityFixedStack<nuint> _recycle;
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private readonly int _elementSize = Unsafe.SizeOf<T>();
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private nuint _buffer;
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private nuint _Capacity, _currentIndex;
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public FixedSlabAllocator(
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nuint buffer,
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nuint count,
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Action<nuint> freeHandle
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)
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{
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_freeHandle = freeHandle;
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_buffer = buffer;
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_Capacity = count;
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int initCount = count switch
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{
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<= 4 => 4,
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> 64 => 64,
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_ => (int)count
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};
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Span<nuint> span = stackalloc nuint[initCount];
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for (int i = 0; i < initCount; i++) {
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span[i] = _buffer + (nuint)(i * _elementSize);
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}
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_recycle = CapacityFixedStackBuilder.Create(span);
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_Capacity = count;
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_currentIndex = (nuint)initCount;
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}
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public override nuint Allocate()
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{
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if (_recycle.TryPop(out nuint handle)) {
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return handle;
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}
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// nuint bufferHandle = _currentBuffer;
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nuint curIndex = _currentIndex;
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if (curIndex >= _Capacity) {
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return 0;
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}
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curIndex = _currentIndex;
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_currentIndex += 1;
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return _buffer + ((nuint)_elementSize * curIndex);
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}
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public override void Dispose()
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{
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if (_disposed) {
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return;
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}
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_disposed = true;
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_freeHandle(_buffer);
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_recycle = null!;
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GC.SuppressFinalize(this);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public override void EnterBufferReading() { }
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public override void ExitBufferReading() { }
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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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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_recycle.Push(index);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public override SlabAllocationHandle<T> ReadAllocation()
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{
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return new SlabAllocationHandle<T>(this, false);
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}
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~FixedSlabAllocator()
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{
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Dispose();
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}
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}
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}
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