can u please open the pdf attached, and make sure u ans in your own way. and no plagiarism and no copying.CMPSC 3113-Operating Systems
Assignment #4
Due Date: Monday, Nov. 16, 2020.
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1. Consider the following resource-allocation policy. Requests for and releases of resources are
allowed at any time. If a request for resources cannot be satisfied because the resources are not
available, then we check any processes that are blocked waiting for resources. If a blocked process
has the desired resources, then these resources are taken away from it and are given to the
requesting process. The vector of resources for which the blocked process is waiting is increased
to include the resources that were taken away.
For example, consider a system with three resource types and the vector Available initialized to
(4,2,2). If process Po asks for (2,2,1), it gets them. If P1 asks for (1,0,1), it gets them. Then, if Po
asks for (0,0,1), it is blocked (resource not available). If P2 now asks for (2,0,0), it gets the
available one (1,0,0) and one that was allocated to Po (since Po is blocked). Po’s Allocation vector
goes down to (1,2,1), and its Need vector goes up to (1,0,1).
a. Can deadlock occur? If you answer “yes,” give an example. If you answer “no,” specify which
necessary condition cannot occur.
b. Can indefinite blocking occur? Explain your answer.
2. Consider the following snapshot of a system: Allocation Max Available —-
Answer the following questions using the banker’s algorithm:
a. What is the content of the matrix Need?
b. Is the system in a safe state?
c. If a request from process P1 arrives for (0,4,2,0), can the request be granted immediately?
3. Consider a paging system with the page table stored in memory.
(a) If a memory reference takes 200 nanoseconds, how long does a paged memory
reference take?
(b) If we add associative registers, and 75% of all page-table references are found in the
associative registers, what is the effective memory reference time? (Assume that finding
a page-table entry in the associative registers takes zero time, if the entry is there.)
Consider the following segment table:
What are the physical addressed for the following logical addresses?
(a) 0,430
(b) 1,10
(c) 2,500
(d) 3,400
(e) 4,112

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