remove a bunch of locks

tanks-backend/TanksServer/Interactivity/BufferPool.cs

@@ -0,0 +1,25 @@
+using System.Buffers;
+
+namespace TanksServer.Interactivity;
+
+internal sealed class BufferPool: MemoryPool<byte>
+{
+    private readonly MemoryPool<byte> _actualPool = Shared;
+
+    public override int MaxBufferSize => int.MaxValue;
+
+    protected override void Dispose(bool disposing) {}
+
+    public override IMemoryOwner<byte> Rent(int minBufferSize = -1)
+    {
+        ArgumentOutOfRangeException.ThrowIfLessThan(minBufferSize, 1);
+        return new BufferPoolMemoryOwner(_actualPool.Rent(minBufferSize), minBufferSize);
+    }
+
+    private sealed class BufferPoolMemoryOwner(IMemoryOwner<byte> actualOwner, int wantedSize): IMemoryOwner<byte>
+    {
+        public Memory<byte> Memory { get; } = actualOwner.Memory[..wantedSize];
+
+        public void Dispose() => actualOwner.Dispose();
+    }
+}