When using M Locks, you must use a well designed and defined locking protocol. Your locking protocol must specify guidelines for acquiring LOCKs, selecting and using timeout, releasing M Locks, defining a lock strategy according the given situation, identifying potential deadlock situations, and providing ways to avoid or recover from them. This section contains two exercises. The first exercise reinforces the concepts of GT.M LOCKs previously explained in this chapter. The second exercise describes a deadlock situation and demonstrates how one can use LKE to identify and resolve it.