Untar the contents to a folder, and type make. This will produce the following:

$1)$ SListSimpleTest program, which is a single threaded test program to test the NodeSLList class. And it works just fine.

$2)$ SListSimpleTest$\_$Threaded program, which will NOT work until you properly add thread synchronization in NodeSLList$\_$Threadable.h and NodeSLList$\_$Threadable.cpp$.$

Your task is to add the proper synchronization to the linked list so it works with both SListSimpleTest AND SListSimpleTest$\_$Threaded.

I would take the following approach:

$1)$ Add syncrhonization, and test it with SListSimpleTest first. Once you have gotten past all the deadlock issues you will most likely created, and it works, move one.

$2)$ Test your syncronization with SListSimpleTest$\_$Threaded. While the list will become stranglely populated because $2$ threads are adding and removing nodes, you should not get any deadlock issues, segmentation issues, or cases where the contents of the linked list were not expected $($e$.$g$.$ garbage values$)$

Hint: You should never need to protect constructors and destructors in C$/$C$++,$ because only $1$ thread can create an object at one time. It's only when multiple threads start using the one instance do you run into problems. That is why SListSimpleTest$\_$Threaded has seperate functions to test construction and destruction.