132 lines
4.3 KiB
C#
132 lines
4.3 KiB
C#
//-----------------------------------------------------------------------
|
|
// -----------------------------------------------------------------------
|
|
// file="SlabAllocator.Fixed"
|
|
// Project: StgSharp
|
|
// AuthorGroup: Nitload
|
|
// Copyright (c) Nitload. 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.HighPerformance.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();
|
|
}
|
|
|
|
}
|
|
}
|