Consider the following process and resource requirement of each process. Type…

2013

Consider the following process and resource requirement of each process. 

                 Type 1        Type 2
Process         Used  Max      Used  Max
   P1            1     2         1    3
   P2            1     3         1    2
   P3            2     4         1    4

Predict the state of this system, assuming that there are a total of 5 instances of resource type 1 and 4 instances of resource type 2.

Answer: C. Unsafe state — First, calculate the available resources for each type by subtracting total used from total instances. For Type 1: Total is 5, Used is 4 (1+1+2), so Available…

  1. A.

    Can go to safe or unsafe state based on sequence

  2. B.

    Safe state

  3. C.

    Unsafe state

  4. D.

    Deadlock state

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Correct answer: C

First, calculate the available resources for each type by subtracting total used from total instances. For Type 1: Total is 5, Used is 4 (1+1+2), so Available = 1. For Type 2: Total is 4, Used is 3 (1+1+1), so Available = 1. The Available Vector is [1, 1].

Next, calculate the remaining need for each process using (Max - Used). P1 Need = [2-1, 3-1] = [1, 2]. P2 Need = [3-1, 2-1] = [2, 1]. P3 Need = [4-2, 4-1] = [2, 3].

Finally, check if any process can be satisfied with the available resources [1, 1]. P1 needs 2 of Type 2 (Available is 1). P2 needs 2 of Type 1 (Available is 1). P3 needs more than available. Since no process can proceed, the system is in an unsafe state.

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