ScriptCore: Implemented Pick-Method and ThreadSafeRandom

ScriptCore/Math/ThreadSafeRandom.cs

@@ -0,0 +1,38 @@
+using System;
+
+namespace GlitchyEngine.Math;
+
+/// <summary>
+/// A thread safe global random number generator.
+/// </summary>
+/// <remarks>
+/// Based on https://andrewlock.net/building-a-thread-safe-random-implementation-for-dotnet-framework/
+/// </remarks>
+public static class ThreadSafeRandom
+{
+    [ThreadStatic]
+    private static Random? _local;
+    private static readonly Random Global = new();
+
+    /// <summary>
+    /// Gets a thread safe random number generator.
+    /// </summary>
+    public static Random Instance
+    {
+        get
+        {
+            if (_local is null)
+            {
+                int seed;
+                lock (Global)
+                {
+                    seed = Global.Next();
+                }
+
+                _local = new Random(seed);
+            }
+
+            return _local;
+        }
+    }
+}