A package generated by a compiler of a computing environment is to be used in inter-process communication between one module and another module running in a single address space of the computing environment. The one module is one class of module and the other module is another class of module, in which the one class of module is different from the other class of module. The one module calls the other module using the inter-process communication, which employs the package generated by the compiler. The called module performs one or more operations, and the one module is placed in a wait state.