Consider the following snapshot of a system: Answer the following questions using the banker’s algorithm:
a. Illustrate that the system is in a safe state by demonstrating an order in which the processes may complete.
b. If a request from process P1 arrives for (1, 1, 0, 0, 1), can the request be granted immediately?
c. If a request from process P4 arrives for (0, 0, 2, 0, 1), can the request be granted immediately?
the processes may complete.
Need = Max – Allocation.
Now, let us see which of the above needs may be met by the Available resources.
P1’s Need are satisfied. So assume we have allocated these resources to P1. P1 completes execution and then releases its resources.
Now Available= <3 3 3 1 2> + <0 1 2 1 1> = <3 4 5 2 3>.
Now, P2’s Need are satisfied. So assume we have allocated these resources to P2. P2 completes execution and then releases its resources.
Now Available= <3 4 5 2 3> + <2 1 0 3 1> = <5 5 5 5 4>.
Now, P3’s Need are satisfied. So assume we have allocated these resources to P3. P3 completes execution and then releases its resources.
Now Available= <5 5 5 5 4> + <1 3 1 2 2> = <6 8 6 7 6>.
Now, P4’s Need are satisfied. So assume we have allocated these resources to P4. P4 completes execution and then releases its resources.
Now Available= <6 8 6 7 6> + <1 4 3 2 2> = <7 12 9 9 8>.
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