LOCKIN is a lock library that includes several lock algorithm implementations mainly in header files for ease of use. Essentially, you can use LOCKIN to easily modify the pthread mutex locks in a system with practically zero effort. GLS is a middleware that makes lock-based programming simple and effective. GLS offers the classic lock-unlock interface of locks. However, in contrast to classic lock libraries, GLS does not require any effort from the programmer for allocating and initializing locks, nor for selecting the appropriate locking strategy.