Answered step by step
Verified Expert Solution
Link Copied!

Question

1 Approved Answer

Let P1 be a process in a multics system. This process has 3 SDW's in its process descriptor segment that allow access to segments S1,S2

image text in transcribed
Let P1 be a process in a multics system. This process has 3 SDW's in its process descriptor segment that allow access to segments S1,S2 and 53. It wants to execute a segment S4 whose SDW is not in the process descriptor segment. The ACL of S4 indicates that P1 can have rew access to it. However, before the access is granted, the reference monitor needs to check access through the rings and brackets. P1 is in ring 7. The ring brackets of the segments are shown below. Based on the specifications, answer the following questions. Segment R1 R2 R3 S1 6 7 6 S2 6 7 S3 2 4 6 S4 0 4 4. 1) List the read, write, execute and call brackets of each segment. 2) What types of access (re.) can P1 have on segments S1 to S4 without a ring transition. Explain how you know 3) Which segments are also Gates? Explain how you know. What will be the ring number that P1 transitions to when it calls each one of the Gate segments? Can P1 call all Gate segments without transitioning? 4) Can P1 execute S4? What gates will it need to call and what ring transitions will happen? Explain with steps. I 5) If P1 can execute S4, which ring will P1 be at that time? Let P1 be a process in a multics system. This process has 3 SDW's in its process descriptor segment that allow access to segments S1,S2 and 53. It wants to execute a segment S4 whose SDW is not in the process descriptor segment. The ACL of S4 indicates that P1 can have rew access to it. However, before the access is granted, the reference monitor needs to check access through the rings and brackets. P1 is in ring 7. The ring brackets of the segments are shown below. Based on the specifications, answer the following questions. Segment R1 R2 R3 S1 6 7 6 S2 6 7 S3 2 4 6 S4 0 4 4. 1) List the read, write, execute and call brackets of each segment. 2) What types of access (re.) can P1 have on segments S1 to S4 without a ring transition. Explain how you know 3) Which segments are also Gates? Explain how you know. What will be the ring number that P1 transitions to when it calls each one of the Gate segments? Can P1 call all Gate segments without transitioning? 4) Can P1 execute S4? What gates will it need to call and what ring transitions will happen? Explain with steps. I 5) If P1 can execute S4, which ring will P1 be at that time

Step by Step Solution

There are 3 Steps involved in it

Step: 1

blur-text-image

Get Instant Access to Expert-Tailored Solutions

See step-by-step solutions with expert insights and AI powered tools for academic success

Step: 2

blur-text-image

Step: 3

blur-text-image

Ace Your Homework with AI

Get the answers you need in no time with our AI-driven, step-by-step assistance

Get Started

Recommended Textbook for

Fundamentals Of International Financial Accounting And Reporting

Authors: Roger Hussey

1st Edition

9814280232, 9789814280235

More Books

Students also viewed these Accounting questions

Question

11.1 Explore the role of labor unions.

Answered: 1 week ago

Question

11.3 Discuss laws affecting collective bargaining.

Answered: 1 week ago