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stgsharp/StgSharp.Common/HighPerformance/Memory/SlabAllocator.Fixed.cs
T

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4.2 KiB
C#

//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="SlabAllocator.Fixed.cs"
// Project: StgSharp
// AuthorGroup: Nitload Space
// Copyright (c) Nitload Space. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the “Software”), to deal in the Software without restriction,
// including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software,
// and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and
// this permission notice shall be included in all copies
// or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED “AS IS”,
// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH
// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
using StgSharp.Collections;
using StgSharp.Mathematics.Memory;
using StgSharp.Threading;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
namespace StgSharp.HighPerformance.Memory
{
internal unsafe class FixedSlabAllocator<T> : SlabAllocator<T> where T: unmanaged
{
private Action<nuint> _freeHandle;
private bool _disposed;
private CapacityFixedStack<nuint> _recycle;
private readonly int _elementSize = Unsafe.SizeOf<T>();
private nuint _buffer;
private nuint _Capacity, _currentIndex;
internal FixedSlabAllocator(nuint buffer, nuint count, Action<nuint> freeHandle)
{
_freeHandle = freeHandle;
_buffer = buffer;
_Capacity = count;
int initCount = count switch
{
<= 4 => 4,
> 64 => 64,
_ => (int)count
};
Span<nuint> span = stackalloc nuint[initCount];
for (int i = 0; i < initCount; i++) {
span[i] = _buffer + (nuint)(i * _elementSize);
}
_recycle = CapacityFixedStackBuilder.Create(span);
_Capacity = count;
_currentIndex = (nuint)initCount;
}
public override nuint Allocate()
{
if (_recycle.TryPop(out nuint handle)) {
return handle;
}
// nuint bufferHandle = _currentBuffer;
nuint curIndex = _currentIndex;
if (curIndex >= _Capacity) {
return 0;
}
curIndex = _currentIndex;
_currentIndex += 1;
return _buffer + ((nuint)_elementSize * curIndex);
}
public override void Dispose()
{
if (_disposed) {
return;
}
_disposed = true;
_freeHandle(_buffer);
_recycle = null!;
GC.SuppressFinalize(this);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public override void EnterBufferReading() { }
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public override void ExitBufferReading() { }
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public override void Free(nuint index)
{
_recycle.Push(index);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public override SlabAllocationHandle<T> ReadAllocation()
{
return new SlabAllocationHandle<T>(this, false);
}
~FixedSlabAllocator()
{
Dispose();
}
}
}