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Operating System

Discuss the difference between deadlock avoidance, detection, and prevention approaches with examples of algorithms being used in each case.

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Discuss the difference between deadlock avoidance, detection, and prevention approaches with examples of algorithms being used in each case.

2nd topic

Ques: -A CPU-scheduling algorithm determines an order for the execution of its scheduled processes. Given n processes to be scheduled on one processor, how many different schedules are possible? Give a formula in terms of n.

Ques: - Many CPU-scheduling algorithms are parameterized. For example, the RR algorithm requires a parameter to indicate the time slice. Multilevel feedback queues require parameters to define the number of queues, the scheduling algorithm foreach queue, the criteria used to move processes between queues, and so on. These algorithms are thus really set of algorithms (for example, the seat of RR algorithms for all time slices,and soon). One set off algorithms may include another.What(if any)relation holds between the following pairs of algorithm sets? a. Priority and SJF b. Multilevel feedback queues and FCFS c. Priority and FCFS d. RR and SJF

Ques: - In Section 6.4, we mentioned that disabling interrupts frequently can affect the system’s clock. Explain why this can occur and how such effects can be minimized.

Ques: - Is it possible to have a deadlock involving only a single process?Explain your answer

Ques: - Race conditions are possible in many computer systems. Consider a banking system with two functions: deposit(amount) and withdraw(amount). These two functions are passed the amount that is to be deposited or withdrawn from a bank account. Assume a shared bank account exists between a husband and wife and concurrently the husband calls the withdraw() function and the wife calls deposit(). Describe how a race condition is possible and what might be done to prevent the race condition from occurring.

Ques:     - Explain why implementing synchronization primitives by disabling interrupts is not appropriate in a single-processor system if the synchronization primitives are to be used in user-level programs.

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