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Consider the following information about resources in a system: There are two classes of resources labelled R1 and R2. There are two instances of each

Consider the following information about resources in a system:

  • There are two classes of resources labelled R1 and R2.
  • There are two instances of each resource.
  • There are four processes labelled P1 through P4.
  • There are some resource instances already allocated to processes, as follows:
  • one instance of R1 held by P2, another held by P3
  • one instance of R2 held by P1, another held by P4
  • Some processes have requested additional resources, as follows:
  • P1 wants one instance of R1
  • P3 wants one instance of R2

a. Draw the resource allocation graph for this system (5 points).

b. Is it possible to have a deadlocked state in this situation? Why or why not? (5 points).

c. Give a possible execution sequence of processes which does not lead to a deadlock (Bonus 5 points).

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