--- a/core/src/luan/LuanState.java	Tue May 26 20:59:05 2015 -0600
+++ b/core/src/luan/LuanState.java	Wed May 27 01:20:49 2015 -0600
@@ -13,6 +13,7 @@
 	final List<StackTraceElement> stackTrace = new ArrayList<StackTraceElement>();
 
 	private Map registry;
+	private final List<LuanFunction> onClose = new ArrayList<LuanFunction>();
 
 	protected LuanState() {
 		registry = new HashMap();
@@ -32,6 +33,17 @@
 		return registry;
 	}
 
+	public void onClose(LuanFunction fn) {
+		onClose.add(fn);
+	}
+
+	public void close() throws LuanException {
+		for( LuanFunction fn : onClose ) {
+			call(fn);
+		}
+		onClose.clear();
+	}
+
 	public static LuanState newInstance() {
 		return LuanCompiler.newLuanState();
 	}