Protection in Grasshopper: A Persistent Operating System

Alan Dearle, R di Bona, J Farrow, F Henskens, D Hulse, A Lindström, S Norris, J Rosenberg, F Vaughan

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Persistent systems support a single storage abstraction in which all data may be created and manipulated in a uniform manner, regardless of its longevity. In such systems a protection mechanism is required to ensure that programs can access precisely those objects they are supposed to access and no others. In a monolingual system this protection can be provided by the type system of the programming language; in systems which support multiple persistent languages a separate protection mechanism must be supported. This paper describes the capability-based protection mechanism employed in Grasshopper, a new operating system specifically designed to support persistent systems on a conventional workstation platform. We show that this mechanism provides sufficient power and flexibility to handle a wide variety of protection scenarios.
Original languageEnglish
Title of host publicationPersistent Object Systems; Proc 6th International Workshop on Persistent Object Systems (POS6)
Place of PublicationTarascon, France
Publication statusPublished - 1994


Dive into the research topics of 'Protection in Grasshopper: A Persistent Operating System'. Together they form a unique fingerprint.

Cite this