Advanced Operating Systems   COMP9242 2002/S2

UNSW

Printer-Friendly Version Administration                - Notices - Course Intro - Consultations # On-line Survey (closed) - Survey Results   Work - Lectures - Milestone 0 - Project Admin - Project Spec - Project FAQ - Exam   Documentation - ASysT Lab - L4 source browser - Sulima ISA Simulator - R4x00 ISA Summary  - MIPS R4700 Reference - MIPS R4000 User Manual  - Network Driver - GT64111   Related Info - Aurema OS Prize - OS Hall of Fame   History - 2000 - 1999 - 1998   Staff - Gernot Heiser (LiC)

Early example: Hydra Separation of mechanism from policy e.g. protection vs. security No hierarchical layering of kernel. Protection, even within OS. Uses (segregated) capabilities. Objects, encapsuation, units of protection. Unique object name, no ownership. Object persistence based on reference counting[WCC$^+$74]. Hydra ... can be considered the first object-oriented OS; has been called the first microkernel OS; has had enormous influence on later operating systems research; was never widely used even at CMU because of poor performance, lack of a complete environment.