142 lines
5.0 KiB
C#
142 lines
5.0 KiB
C#
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="L4.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.Collections;
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using StgSharp.Mathematics.Memory;
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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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using System.Xml.Serialization;
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namespace StgSharp.HighPerformance.Memory
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{
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public unsafe partial class L4 : IDisposable
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{
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private const int CacheLineCount = 8192;
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private bool _disposed;
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private int _activeCount;
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private readonly nuint _baseAddress;
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private readonly SlabAllocator<CacheLineData> _cacheLineAllocator;
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private readonly SlabAllocator<CacheLineHead> _entryAllocator;
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private readonly SwissTable _map;
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public L4()
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{
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int cacheSize = Unsafe.SizeOf<CacheLineData>() * CacheLineCount;
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int entrySize = Unsafe.SizeOf<CacheLineHead>() * CacheLineCount;
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int mapSize = SwissTable.RequestedNativeMemorySize;
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_baseAddress = (nuint)NativeMemory.AlignedAlloc((nuint)(cacheSize + entrySize + mapSize), 16);
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nuint _buffer = _baseAddress;
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_cacheLineAllocator = SlabAllocator.FromBuffer<CacheLineData>(_buffer, CacheLineCount, _ => { });
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_entryAllocator = SlabAllocator.FromBuffer<CacheLineHead>(_buffer + (nuint)cacheSize, CacheLineCount, _ => { });
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_map = SwissTable.Create(_baseAddress + (nuint)(cacheSize + entrySize), _ => { });
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}
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[System.Diagnostics.CodeAnalysis.SuppressMessage(
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"Design",
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"CA1063:Implement IDisposable correctly",
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Justification = """
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Only owns native memory via NativeMemory.AlignedFree();
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no managed IDisposable fields.
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Dispose(bool) pattern is unnecessary.
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""")]
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public 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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NativeMemory.AlignedFree((void*)_baseAddress);
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GC.SuppressFinalize(this);
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}
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public CacheLine Map(nuint origin)
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{
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if (_map.TryGet(origin, out nuint entryHandle))
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{
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// cache hit
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CacheLineHead* entry = (CacheLineHead*)entryHandle;
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return new CacheLine(entry->_address, ref _activeCount, ref entry->_refCount);
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}
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// cache miss
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/*
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* post command
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* then wait for completion
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*/
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return origin; //error now
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}
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public ref struct CacheLine : IDisposable
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{
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private ref int _activeCount;
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private ref int _refCount;
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private nuint _handle;
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internal CacheLine(nuint handle, ref int activeCount, ref int cacheRefCount)
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{
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_handle = handle;
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_refCount = ref cacheRefCount;
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_activeCount = ref activeCount;
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_ = Interlocked.Increment(ref _activeCount);
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_ = Interlocked.Increment(ref _refCount);
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}
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public void Dispose()
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{
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if (_handle == 0) {
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return;
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}
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_handle = 0;
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_ = Interlocked.Decrement(ref _activeCount);
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_ = Interlocked.Decrement(ref _refCount);
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}
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}
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private struct CacheLineData
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{
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private fixed byte Data[8192];
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}
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}
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}
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