A system shares 9 tape drives. The current allocation and maximum requirement…
2025
A system shares 9 tape drives. The current allocation and maximum requirement of tape drives for three processes are shown below: Which of the following best describes current state of the system?
- A.
Safe, Deadlocked
- B.
Safe, Not Deadlocked
- C.
Note Safe, Deadlocked
- D.
Not Safe, Not Deadlocked
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Correct answer: B
Answer
Option 2 : Safe, Not Deadlocked
Available = 9 – ∑ (current allocation to process) = 9 – 7 = 2
Now, 2 resource will satisfy the need of P3.
After this available = 2 + 3 = 5
5 resource can satisfy need of P2 or P1
CASE 1:
If P2 is executed before P1,
Available = 5 + 1 =6
6 resource can satisfy the need of P1 easily.
CASE 2:
If P1 is executed before P2
Available = 5 + 3 = 8
8 resource can satisfy the need of P1 easily.
Safe sequence will be P3, P1, P2 and P3, P2, P1
System is safe and there is no deadlock in the system.