Respuesta :
Complete Data:
Job No. Devices Allocated Maximum Required Remaining Need
Job 1 6 8 X
Job 2 2 9 X
Job 3 5 8 X
Job 4 3 5 X
Answer:
a) Number of available devices = 2
b) Remaining need for job 1 = 2
Remaining need for job 2 = 7
Remaining need for job 3 = 3
Remaining need for job 4 = 2
c) The system is safe
Explanation:
a) Calculate the number of available devices
Number of available devices = (Maximum number of devices) - (Total number of devices allocated)
Maximum number of devices = 18
Total number of allocated devices = (6 + 2 + 5 + 3)
Total number of allocated devices = 16
Number of available devices = 18 - 16
Number of available devices = 2
b) Determine the remaining needs for each job in each system
Remaining needs = (Maximum Required - Number of devices allocated)
For Job 1
Remaining need = 8 - 6 = 2
For Job 2
Remaining need = 9 - 2 = 7
For Job 3
Remaining need = 8 - 5 = 3
For Job 4
Remaining need = 5 - 3 = 2
c) Determine whether the system is safe or unsafe
For the system to be safe, Need ≤ Available
Where New Available = Available + Allocation
For Job 1
Need = 2
Available devices = 2
2 ≤ 2 (Job 1 is safe)
New available = 2 + 6 = 8
For Job 2
Need = 7
Available devices = 8
7 ≤ 8 (Job 2 is safe)
New available = 2 + 8 = 10
For Job 3
Need = 3
Available devices = 10
3 ≤ 10 (Job 3 is safe)
New available = 5 + 10 = 15
For Job 4
Need = 2
Available devices = 15
2 ≤ 15 (Job 2 is safe)
New available = 3 + 15 = 18
Since all the jobs are safe, the system is safe
