Question on Deadlock | Operating System - M04 P07

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This is a multipart blog article series, and in this series I am going to explain you the concepts of operating system. This article series is divided into multiple modules and this is the forth module which consists of 8 articles.

In this article we will see one question based on the concept of deadlock in an operating system.

Question: A system is having 3 processes each requires 2 units of resources R. The minimum number of units of R requires such that no deadlock will occur?

  1. 3
  2. 5
  3. 6
  4. 4

Answer:

  • (d) 4 resources
  • We need 4 resources of R because then in worst condition when all the processes request for resource we can give one resource to every process and still one resource will be remaining.
  • If we give that resource to any process than it will get terminate because one process require only two resources and when they get that their execution will be complete.
  • Now we have two free resources and two processes that need two resources and hence they will also get executed and thus no deadlock will occur.
  • If we take 3 resource than deadlock will occur and we are not taking 5 or 6 because we need to find minimum number of resources.

So this was a simple question on deadlock in an operating system. Hope you liked it and learned something new from it.

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