Skip to content
Related Articles

Related Articles

Improve Article
UGC-NET | UGC NET CS 2016 July – II | Question 37
  • Last Updated : 20 Apr, 2018

Suppose there are four processes in execution with 12 instances of a Resource R in a system.
The maximum need of each process and current allocation are given below:
37 (2)
With reference to current allocation, is system safe ? If so, what is the safe sequence ?
(A) No
(B) Yes, P1P2P3P4
(C) Yes, P4P3P1P2
(D) Yes, P2P1P3P4


Answer: (C)

Explanation: Current allocation of P1P2P3P4 are 3, 4, 2, 1 which is 10 in total.
We have 12 total no of resources and out of them 10 are allocated so, we have only 2 resources.
There is 5, 5, 3, 2 resources are needed for P1P2P3P4 respectively.
So, P4 will run first and free 3 resources after execution. Which are sufficient for P3 So it will execute and do free 5 resources.
Now P1 and P2 both require 5 resources each So we can execute any of them first but we will give priority to P1. The execution order will be P4P3P1P2.
SO, option (C) is correct.

Quiz of this Question

My Personal Notes arrow_drop_up
Recommended Articles
Page :