Let us start here, from square one. No, from Zero!

script/instance.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <thread>
+#include <mutex>
+#include <string_view>
+
+namespace script {
+    struct LuaData;
+
+    class Instance {
+    private:
+        LuaData *lua = nullptr;
+        std::thread *thread = nullptr;
+        std::mutex thread_m;
+        bool running = false;
+        bool paused = false;
+        bool error = false;
+
+    public:
+
+        Instance(const char *str, bool is_path = true, bool sandbox = false);
+        ~Instance();
+
+        void join();
+        void stop();
+        void pause();
+        void resume();
+
+        inline bool is_running() {
+            return running;
+        }
+
+        inline bool is_paused() {
+            return paused;
+        }
+    };
+
+    extern thread_local Instance *INSTANCE;
+}