Operating Systems · Chapter 7

Deadlock & Banker’s Algorithm Simulator

Edit Allocation, Maximum, and Available resources. The simulator computes Need = Maximum − Allocation and checks whether the system is in a safe state.

Processes Resource types Scenario

Resource Matrices

Process	Allocation	Maximum	Need
Process

Available

Banker Analysis

Current Work vector

Safe sequence

Unfinished processes

Run the analysis to evaluate the system state.

How Banker’s Algorithm Works

1. Compute Need = Maximum − Allocation.

2. Set Work = Available and mark every process unfinished.

3. Find an unfinished process whose Need is less than or equal to Work.

4. Pretend that process finishes, then add its Allocation back into Work.

5. If every process can finish, the state is safe. Otherwise, no safe sequence exists from the current state.

A safe state does not mean deadlock has already occurred; it means the system still has at least one completion order that avoids deadlock.