working on dynamic wrapping

StgSharp.Mathematics/Numeric/MatrixParallel.Publish.cs

@@ -820,9 +820,15 @@ namespace StgSharp.Mathematics.Numeric
             int tileWidth = (1024 / secCount) + 1;
             int tileCount = (primCount + tileWidth - 1) / tileWidth;
 
-            CapacityFixedStack<MatrixParallelThread> pool = LeadParallel();
+            ReadOnlySpan<MatrixParallelThread> pool = LeadParallel(tileCount);
 
-            int threadCount = pool.Count;
+            int threadCount = pool.Length;
+            if (pool.Length == 0)
+            {
+                /*
+                 * wait until has enough threads
+                 */
+            }
             int tilePerThreadLess = tileCount / threadCount;                           // tiles per thread without extra slice
             int columnAfterBaseTile = tileCount % threadCount * tileWidth;             // tile sliced into columns
             int extraColumnPerThread = columnAfterBaseTile / threadCount;
@@ -831,17 +837,8 @@ namespace StgSharp.Mathematics.Numeric
             int total = primCount;
             Stack<MatrixParallelWrap> taskBunch = new Stack<MatrixParallelWrap>(threadCount);
             MatrixParallelTaskPackage<T>* current = package;
-            while (true)
+            foreach (MatrixParallelThread thread in pool)
             {
-                if (!pool.TryPop(out MatrixParallelThread? wrap) || wrap is null)
-                {
-#if DEBUG
-                    throw new InvalidOperationException("Someone steal parallel wraps from the pool.");
-#else
-                    break;
-#endif
-                }
-
                 bool hasSlice = columnAfterBaseTile > 0;
                 bool isLargeSlice = extraColumnCount > 0;
 
@@ -872,7 +869,7 @@ namespace StgSharp.Mathematics.Numeric
                 total -= columnInWrap;
 
                 // set to wrap and push
-                wrap.Tasks.Enqueue((IntPtr)current);
+                // wrap.Tasks.Enqueue((IntPtr)current);
 
                 // taskBunch.Push(wrap);
 
@@ -884,7 +881,6 @@ namespace StgSharp.Mathematics.Numeric
                 current = MatrixParallelFactory.FromExistPackage(current);
                 current->PrimTileOffset += columnInWrap;
             }
-            ReleaseParallelLeadership(ref pool);
 
             return taskBunch;
         }