There are 4 processes – PO, P1,P2,P3 and three resources A,B,C are available. The resource A has 9, B has 4 instances, C has 5 instances. Use Banker's algorithm to find out whether the system is in safe state or not. Max Allocation Need Available A B A A C A B C PO 3 3 2 2 1 1 4 P1 3 1 1 13 1 P2 5 1 2 P3 2 1 2 1 i) Calculate the need matrix ii) Identify the safe sequence U-O o o
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- 50. Match the following.i) Mutual exclusion a) A process may hold allocated resources while waiting assignment.ii) Hold and wait b) No resource can be forcibly removed from a process holding it.iii) No preemption c) Only one process may use a resource at a time. a. i-a, ii-b, iii-c b. i-a, ii-c, iii-b c. i-b, ii-c, iii-a d. i-c, ii-a, iii-bA deadlock occurs when a group of processes is stalled because one process is holding a resource and waiting for another process to obtain it. Consider the situation when two trains are approaching each other on the same track and there is only one track: once they are in front of each other, neither train can proceed. In operating systems, a similar scenario happens when two or more processes possess certain resources while waiting on resources owned by other processes (s). In the picture below, Process 1 is holding Resource 1 and waiting for Process 2 to acquire Resource 2, while Process 2 is waiting for Resource 1. Give an example of a realistic deadlock avoidance approach and describe the basic strategy behind it.A system has three processes (P1,P2, P3) and three resources (R1,R2, R3). There is one instance of R1 and R2. There are three instances of R3. P1 holds an R1 and is requesting an R3. P2 holds an R3 and is requesting an R1. P3 holds two instances of R3 and an R2. Does a deadlock exist? Justify your answer.
- Processes P1, P2, and P2 are queued to run. The arrival time of P1 is t = 0, the arrival time of P2 is t = 1, and the arrival time of P3 is t = 2. According to the first come first serve (FCFS) algorithm, processes are run by the operating system. P1 operates 7 time units, P2 4 time units, P3 operates 1 time unit. So what is the average waiting time (in time units) for this system? 0 5 3 74. With a single resource, deadlock occurs a. if there are more than two processes competing for that resource b. if there are only two processes competing for that resource c. if there is a single process competing for that resource d. none of theseQ1: c) Consider the system with 5 processes <P0, P1, P2, P3, P4> and three resources types (4)A=13, B=13 and C=9. The following information has been attached. Is the system in safe state?? (If yes find the safe sequence using Banker’s Algorithm)
- 7. 'm' processes share 'n' resources of the same type. The maximum need of each process doesn't exceed 'n' and the sum all the their maximum needs is always less than m + n. In this set up a. deadlock can never occur b. deadlock may occur c. deadlock has to occur d. none of these5. A state is safe if the system can allocate resources to each process (up to its maximum) in some order and still avoid deadlock. Then a. deadlocked state is unsafe b. unsafe state may lead to a deadlock situation c. deadlocked state is a subset of unsafe state d. all of theseA system has three processes (P1, P2, P3) and three reusable resources (R1, R2, R3). There is one instance of R1, two instances of R2 and three instances of R3. P1 holds an R1 and an R3 and is requesting an R2. P2 holds an R3 and is requesting an R1 and an R2. P3 holds two R2 and an R3 and is requesting an R1. How many cycles are there? Does a deadlokc exist? Why?
- Suppose there are three processes, P1, P2, and P3, and three files, FileA, FileB, and FileC. P1 has FileA and wants FileC. P2 has FileB and wants FileA. P3 has FileC and wants FileB. a) Draw a resource allocation graph for this situation. b) Does the graph represent a deadlock? Why or why not? Explain.1.In the Readers-Writers problem, more than one writer can access the buffer at the same time to write True False 2.Given that processes P1 and P2 are using semaphores to lock resources, determine whether or not the following sequence of requests results in a deadlock. Initially, all resources are available. P1: P2: wait(A) wait(C) wait(B) wait(B) ... .... signal(A) signal(B) signal(B) signal(C) Yes No Insufficient information 3.If no process is executing in its critical section and there exist some processes that wish to enter their critical section, then the selection of the processes that will enter the critical section next cannot be postponed indefinitely. Which option describe best Mutual Exclusion Progress Bounded Waiting None of the above 4.In the producer-consumer problem, the "out" will be used to point to the index in the buffer where a producer can produce next. True False 5.Entry section and Exit section in the code together are referred to as a solution for…81. Given a priori information about the ________ number of resources of each type that maybe requested for each process, it is possible to construct an algorithm that ensures that the system will never enter a deadlock state. a. minimum b. average c. maximum d. approximate