Assume a system with 3 processes P1, P2, and P3, and resources R1, R2, and R3. Each resource has a single instance.
Draw a resource allocation graph for the following sequence of events:
Convert your resource allocation graph to a wait-for graph. Is there a deadlock?
Assume a system with 3 processes P1, P2, and P3, and resources R1, R2, and R3....
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...
(1) Having the following sets: [2 marks] P: P1, P2, P3 R: R1, R2, R3 E: P1→R2, P2→R1 R1→P1, R2→P2, R3→P3 Draw the resource allocation graph of the previous system? Examine if the system deadlocked or not and list all the cycles?
A system has five processes P1 through P5 and four resource types R1 through R4. There are 2 units of each resource type. Given that: P1 holds 1 unit of R1 and requests 1 unit of R4 P2 holds 1 unit of R3 and requests 1 unit of R2 P3 holds one unit of R2 and requests 1 unit of R3 P4 requests 1 unit of R4 P5 holds one unit of R3 and 1 unit of R2, and requests...
Consider the following snapshot of a system: Allocation P R1 R2 R3 R4 P1 0 0 1 2 P2 1 0 0 0 P3 1 3 5 4 P4 0 6 3 2 P5 0 0 1 4 P represents processes R represents resources Need P R1 R2 R3 R4 P1 0 0 1 2 P2 1 7 5 0 P3 2 3 5 6 P4 0 6 5 2 P5 0 6 5 6 P represents processes R represents...
Given the table, suppose we have avoided circular-wait by ordering the resources in the order R1 -> R2 -> R3 -> R4 and enforcing that each process must request resources in the ascending order. Show one allocation possibility of R1-R4 to P1-P4 and the corresponding wait-for graph. If there is a deadlock, please explain why or why not? Resource No. of instances Requested Allocated R1 2 P1, P2 ? R2 1 P1, P3 ? R3 1 P3, P4 ? R4...
Answer the following question: Process p1 needs to access resources r1, r2, r3, in some order. Process p2 needs to access resources r2, r3, r4, in some order. Which of the access sequences by p1 and p2 would violate an ordered resources policy and could lead to a deadlock? P1: r1, r3, r2 P2: r2, r3, r4 P1: r1, r2, r3 P2: r2, r3, r4 P1: r2, r1, r3 P2: r3, r2, r4 P1: r3, r2, r1 P2: r3, r4,...
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...
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...
Assume in a system, there are:
- 3 processes P1 to P3;
- 3 resource types: A(9 instances), B(5 instances), and C(5
instances).
Below is a snapshot at time T:
1) Show that the system is in a safe state at time T.
2) Can request for (A: 2, B: 0, C: 0) by P1 be granted? Explain
your answer.
Thank you so much, and it would be much better if it is well
written and explained.
Allocation Max Pl...
A system has four resource types (A, B, C, D) and four processes {P1, P2, P3, P4 }.The maximum demands for each process is P1(4,3,2,2), P2(1,2,3,4), P3(1,1,5,0) and P4(3,2,1,5). The current allocation is: P1(1,2,2,1), P2(1,0,3,3) and P3(1,1,1,0) and P4(2,1,0,3). available resource is P1(3,1,1,2) (a) Is this state a safe state? Explain your all answer by identifying a successful future sequence of processes that makes the state safe.