Accession Number : ADA191543

Title :   Elmwood - An Object-Oriented Multiprocessor Operating System.

Descriptive Note : Technical rept.,

Corporate Author : ROCHESTER UNIV NY DEPT OF COMPUTER SCIENCE

Personal Author(s) : Mellor-Crummey, J M ; LeBlanc, T J ; Crowl, L A ; Gafter, N M ; Dibble, P C

PDF Url : ADA191543

Report Date : Sep 1987

Pagination or Media Count : 37

Abstract : Elmwood is an object-oriented, multiprocessor operating system designed and implemented as a group project at the University of Rochester. An Elmwood object, consisting of code and data, represents an instance of an abstracts data type. Only the code associated with an object may access its data; interaction between objects is via remote procedure call. Access to an object requires that the caller provide an appropriate logical object name, which denotes a kernel-protected pair containing an object reference and a context value. Elmwood provides only basic mechanisms for protection and synchronization; the object itself supplies and interprets the context value, thereby implementing its own policies for protection and synchronization. We describe the Elmwood design, and multiprocessor implementation for the BBN Butterfly Parallel Processor, and our experiences in building a functionally-complete operating system as a group project in four months.

Descriptors :   *MULTIPROCESSORS, ABSTRACTS, POLICIES

Subject Categories : Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE