Homework Answers
There will not be deadlock as the resource pools for both are different and hence deadlock is not possible and even when the resources were same then they can easily relinquish lock and get lock on other resource
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The following snapshot is not in a safe state. Explain in two to three sentences why...
Please give an explanation for the answers as well. 1. A system has three processes (P1,...
Please give an explanation for the answers as well. 1. A system has three processes (P1, P2, and P3) and three resources (R1, R2, and R3). There is one instance of RI, two instances of R2, and three instances of R3. PI holds RI and one instance of R3 and is requesting one instance from R2. P2 holds one instance of R3 and is requesting RI and one instance from R2. P3 holds two instances of R2 and one instance...
a. A system has two processes and three identical resources. Each process needs a maximum of...
a. A system has two processes and three identical resources. Each process needs a maximum of two resources. Is deadlock possible? Explain your answer. b. A system has 4 processes, P1 through P4, and 5 types of resources, R1 through R5. Existing resource vector E = (3, 2, 1, 2, 2) Current allocation matrix C = R1 R2 R3 R4 R5 P1 1 1 0 0 0 P2 0 0 1 0 0 P2 1 0 0 20 P4 0...
Consider the following snapshot of a system: Process РО P1 P2 P3 P4 Allocation A B...
Consider the following snapshot of a system: Process РО P1 P2 P3 P4 Allocation A B C D 2013 2 2 1 0 3 1 2 1 0 4 1 0 4 2 1 2 Max A B C D 5 1 1 6 3 2 1 1 3 2 2 1 4 6 1 2 5 3 2 5 Using the banker's algorithm, determine whether or not each of the following states is unsafe. If the state is safe,...
Deadlocks and Banker’s Algorithm Is the following state safe? Is the following state safe? Suppose there...
Deadlocks and Banker’s Algorithm
Is the following state safe? Is the following state safe? Suppose there are three processes. A, B, and C, and three resources, a CD-ROM, a printer, and a keyboard. Draw a resource allocation graph showing a deadlock involving all three processes. For each of the following cases, which deadlock-handling mechanism would you use and why? The computer is up for a very long time, the system runs a lot of batch jobs, and the processor is...
1. (10 pts) Find safe states/safe executing sequences. If none, explain why. Show your calculation step...
1. (10 pts) Find safe states/safe executing sequences. If none, explain why. Show your calculation step by step. Three types of resources: A, B, and C. Six processes: PO, P1, P2, P3, P4, and P5. The 'has', 'max', and 'free' tables are as follows. (Stepwise calculation is 6 pts and the result is 4 pts.) Has Max Free A B C A B C | B C PO 1 O 1 2 9 5 L 5 2 P1 1 1...
Consider the following snapshot of a system: Allocation Max Available ABCD ABCD ABCD P0 1121 2233...
Consider the following snapshot of a system: Allocation Max Available ABCD ABCD ABCD P0 1121 2233 2212 P1 2122 5445 P2 3010 3121 P3 1001 2311 P4 2000 3221 Answer the following questions using the banker`s algorithm: a) Illustrate that the system is in a safe state by demonstrating an order in which the processes may complete. Give the Available matrix after completion of each process.
Let I represent an execution of init(s), W of wait(s), and S of signal(s). Then, for...
Let I represent an execution of init(s), W of wait(s), and S of signal(s). Then, for example, IWWS represents the sequence of calls init(s), wait(s), wait(s), and signal(s) by some processes in an operating system. For each of the following sequences of calls, state the value of s and the number of processes blocked after the last call in the sequence: (b) IS (c) ISSSW (d) IWWWS (e) ISWWWW Each of the following code fragments contains a bug in the...
Part B (10) Deadlock Avoidance Consider the following maximum-claim reusable resource system with four processes and...
Part B (10) Deadlock Avoidance Consider the following maximum-claim reusable resource system with four processes and three resource types. The maximum claim matrix is given by C [4 3 5 11 1 41 1 4 6 13 1 6] where Cij denote maximum claim of process i for resourcej. The total units of each resource type are given by the vector (5, 8, 15). The current allocation of resources is given by the matrix To 1 4] 2 0 1...
The below pseudocode shows functions p1 and p2, used by two separate processes. These processes share...
The below pseudocode shows functions p1 and p2, used by two separate processes. These processes share two mutexes, m1 and m2. The code uses a made-up API for mutexes: atomic_lock() to take a mutex, and unlock() to release it. Assume that atomic_lock() busy waits until the mutex can be taken, and assume that this API is implemented in a thread-safe manner. void pio { atomic_lock(&ml); atomic_lock(8m2); 1/run critical region.. unlock(8m2); unlock(&ml); void p20 atomic lock(8m2): atomic lock&mi); Hrun critical region......
operating system 6) Banker's algorithm is used in deadlock avoidance, and the following table presents the...
operating system
6) Banker's algorithm is used in deadlock avoidance, and the following table presents the current situation: hAvailable e Need Allocation 2 31vqas 5 2 3 1 10 PO 1 20 P1 2 0 1 4 20 P2 1 0 2 no0 1 1 to P3 43 1 3 3 2 P4 1 12 Questions: (1) is the current situation safe? (2) if PO requests (2, 2, 0), will the system allocate the resources? (3) if PO requests (2,...
Please give an explanation for the answers as well. 1. A system has three processes (P1, P2, and P3) and three resources (R1, R2, and R3). There is one instance of RI, two instances of R2, and three instances of R3. PI holds RI and one instance of R3 and is requesting one instance from R2. P2 holds one instance of R3 and is requesting RI and one instance from R2. P3 holds two instances of R2 and one instance...
a. A system has two processes and three identical resources. Each process needs a maximum of two resources. Is deadlock possible? Explain your answer. b. A system has 4 processes, P1 through P4, and 5 types of resources, R1 through R5. Existing resource vector E = (3, 2, 1, 2, 2) Current allocation matrix C = R1 R2 R3 R4 R5 P1 1 1 0 0 0 P2 0 0 1 0 0 P2 1 0 0 20 P4 0...
Consider the following snapshot of a system: Process РО P1 P2 P3 P4 Allocation A B C D 2013 2 2 1 0 3 1 2 1 0 4 1 0 4 2 1 2 Max A B C D 5 1 1 6 3 2 1 1 3 2 2 1 4 6 1 2 5 3 2 5 Using the banker's algorithm, determine whether or not each of the following states is unsafe. If the state is safe,...
Deadlocks and Banker’s Algorithm
Is the following state safe? Is the following state safe? Suppose there are three processes. A, B, and C, and three resources, a CD-ROM, a printer, and a keyboard. Draw a resource allocation graph showing a deadlock involving all three processes. For each of the following cases, which deadlock-handling mechanism would you use and why? The computer is up for a very long time, the system runs a lot of batch jobs, and the processor is...
1. (10 pts) Find safe states/safe executing sequences. If none, explain why. Show your calculation step by step. Three types of resources: A, B, and C. Six processes: PO, P1, P2, P3, P4, and P5. The 'has', 'max', and 'free' tables are as follows. (Stepwise calculation is 6 pts and the result is 4 pts.) Has Max Free A B C A B C | B C PO 1 O 1 2 9 5 L 5 2 P1 1 1...
Part B (10) Deadlock Avoidance Consider the following maximum-claim reusable resource system with four processes and three resource types. The maximum claim matrix is given by C [4 3 5 11 1 41 1 4 6 13 1 6] where Cij denote maximum claim of process i for resourcej. The total units of each resource type are given by the vector (5, 8, 15). The current allocation of resources is given by the matrix To 1 4] 2 0 1...
The below pseudocode shows functions p1 and p2, used by two separate processes. These processes share two mutexes, m1 and m2. The code uses a made-up API for mutexes: atomic_lock() to take a mutex, and unlock() to release it. Assume that atomic_lock() busy waits until the mutex can be taken, and assume that this API is implemented in a thread-safe manner. void pio { atomic_lock(&ml); atomic_lock(8m2); 1/run critical region.. unlock(8m2); unlock(&ml); void p20 atomic lock(8m2): atomic lock&mi); Hrun critical region......
operating system
6) Banker's algorithm is used in deadlock avoidance, and the following table presents the current situation: hAvailable e Need Allocation 2 31vqas 5 2 3 1 10 PO 1 20 P1 2 0 1 4 20 P2 1 0 2 no0 1 1 to P3 43 1 3 3 2 P4 1 12 Questions: (1) is the current situation safe? (2) if PO requests (2, 2, 0), will the system allocate the resources? (3) if PO requests (2,...
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