The lady programming environment for distributed operating systems

Abstract

The LADY programming environment has been developed to support the design, implementation, testing, debugging and monitoring of distributed systems with special focus on operating systems. This paper describes the structuring model of the system implementation language LADY. In LADY, a distributed system is viewed as a collection of cooperating objects connected through typed interfaces. The language offers dynamic modifications of the program structure such as generation and deletion of objects and their interconnections as well as migration and checkpointing of objects. Further features include the extensibility of programs and recursive definition of objects. The structuring facilities of LADY are demonstrated by an example and experiences with the language are discussed.