A `two degrees of freedom´ approach for parallel programming

The concept of a priority controlled module (PCM), which is intended to implement shared objects in a parallelism environment is presented. Semantics of a PCM are given using a temporal logic. Experiences adapting the inheritance mechanisms to the synchronization domain using the concept of a PCM are also described. Because PCM mainly relies on the separation between data abstraction and synchronization, either of these can be thought as a degree of freedom. Each degree of freedom appears as a reusable programming entity, and can be implemented using the concept of a class occurring in the object-oriented languages