127 lines
4.5 KiB
C#
127 lines
4.5 KiB
C#
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="SlabAllocator.Chunked.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 StgSharp.Threading;
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using System;
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using System.Collections.Generic;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using System.Threading;
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namespace StgSharp.HighPerformance.Memory
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{
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internal sealed unsafe class ChunkedSlabAllocator<T> : SlabAllocator<T> where T: unmanaged
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{
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private BufferStack<nuint> _buffers;
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private BufferStack<nuint> _recycle;
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private readonly int _elementSize = Unsafe.SizeOf<T>();
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private nuint _currentBuffer;
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private nuint _currentCapacity, _currentIndex;
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public ChunkedSlabAllocator(nuint count)
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{
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_currentBuffer = (nuint)NativeMemory.Alloc(count * (nuint)_elementSize);
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_currentCapacity = 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] = _currentBuffer + (nuint)(i * _elementSize);
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}
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_buffers = new(4);
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_recycle = BufferStackBuilder.Create(span);
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_currentCapacity = 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 >= _currentCapacity)
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{
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nuint cap = _currentCapacity;
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nuint newBuffer = (nuint)NativeMemory.Alloc(cap * (nuint)_elementSize);
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_buffers.Push(bufferHandle);
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_currentBuffer = newBuffer;
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_currentIndex = 0;
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}
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curIndex = _currentIndex;
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_ = Interlocked.Add(
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ref Unsafe.As<nuint, ulong>(ref _currentIndex), (ulong)_elementSize);
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return _currentBuffer + ((nuint)_elementSize * curIndex);
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}
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public override void Dispose()
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{
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NativeMemory.Free((void*)_currentBuffer);
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while (_buffers.TryPop(out nuint buffer)) {
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NativeMemory.Free((void*)buffer);
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}
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_buffers.Dispose();
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_recycle.Dispose();
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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(nuint index)
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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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~ChunkedSlabAllocator()
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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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