fix severe bug

StgSharp.Common/HighPerformance/Memory/L4.Prefetch.cs

@@ -2,8 +2,8 @@
 // -----------------------------------------------------------------------
 // file="L4.Prefetch"
 // Project: StgSharp
-// AuthorGroup: Nitload Space
-// Copyright (c) Nitload Space. All rights reserved.
+// 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
@@ -25,13 +25,6 @@
 //     
 // -----------------------------------------------------------------------
 // -----------------------------------------------------------------------
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Security.Cryptography.X509Certificates;
-using System.Text;
-using System.Threading.Tasks;
-
 namespace StgSharp.HighPerformance.Memory
 {
     public unsafe partial class L4
@@ -67,17 +60,22 @@ namespace StgSharp.HighPerformance.Memory
                 {
                     continue;
                 }
-                if (!TryGetEmptyLine(out int index)) {
+
+                // TODO 未经初始化的_idMux可能会导致TryGetEmptyLine失败，导致无法预取，最好添加末尾指针计数
+                if (!TryGetEmptyLine(out int index))
+                {
                     throw new OverflowException("L4 has no empty cache line.");
                 }
                 CacheLineHead* head = &_head[index];
 
                 // pre fetch them here
-                PrefetchPredict.Prefetch(head->_origin, _head->_profile, _head->_address);
+                _ = PrefetchPredict.Prefetch(head->_origin, head->_profile, head->_address);
             }
         }
 
-        private partial bool TestHit(nuint origin)
+        private partial bool TestHit(
+                             nuint origin
+        )
         {
             if (_map.TryGet(origin, out nuint handle))
             {

StgSharp.Common/HighPerformance/Memory/L4.cs

@@ -78,7 +78,7 @@ namespace StgSharp.HighPerformance.Memory
             _prediction = (CacheLinePrediction*)ptr;
             ptr += predictionSize;
             _map = SwissTable.Create(_baseAddress + cacheSize + entrySize, _ => { });
-            _prediction = (CacheLinePrediction*)ptr;
+            ptr += mapSize;
             _eviction = (EvictionArray*)ptr;
             ptr += rrpvSize;
             _idMux = new UnmanagedStack<int>((int*)ptr, CacheLineCount, _ => { });
@@ -132,6 +132,7 @@ namespace StgSharp.HighPerformance.Memory
                             _prefetching = 0;
                         }
                     }
+                    Thread.Sleep(0);
                 }
             }
             while (true)