Initial data commit

Task/Stack/Oz/stack.oz

@@ -0,0 +1,31 @@
+functor
+export
+   New
+   Push
+   Pop
+   Empty
+define
+   fun {New}
+      {NewCell nil}
+   end
+
+   proc {Push Stack Element}
+      NewStack
+      %% Use atomic swap for thread safety
+      OldStack = Stack := NewStack
+   in
+      NewStack = Element|OldStack
+   end
+
+   proc {Pop Stack ?Result}
+      NewStack
+      %% Use atomic swap for thread safety
+      OldStack = Stack := NewStack
+   in
+      Result|NewStack = OldStack
+   end
+
+   fun {Empty Stack}
+      @Stack == nil
+   end
+end