CSE 221: Homework 1
Due: Thursday, January 27, 2005 in class
Answer the following questions. Support your answers with
material from the referenced papers, or with your own critical
arguments, as appropriate. I am interested in your justifications as
much as the answer itself. There may not necessarily be a "right"
answer, although some answers may be easier to justify. Finally, do
not use shorthand -- write your answers using complete sentences.
- The Multics paper lists a set of principles for protection in an
operating system. Critique Hydra according to those principles. To
what extent does Hydra implement each principle?
- Critique Pilot according to the same principles. For each, if
you think that Pilot does not implement the principle, explain whether
it is important (or not) that it does not.
- Both Pilot and Swift used typesafe languages to implement the
system, and both reported significant benefits in doing so. Why do
you think the operating systems we use are not implemented in
- Pilot made a strong argument for tailoring the design and
implementation of operating systems to personal computers. Why do you
think we still run timesharing systems on our PCs?