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Avoiding Deadlock Traffic.

Question

How would you use the Deadlock Prevention solution to solve the traffic issue? How would you use the Deadlock avoidance solution to solve the traffic issue?

Answer

In a resource-allocation graph, the processes are represented by circles, and the resources are represented by rectangles. The arrows between the circles and the rectangles indicate the requests and allocations.

In a deadlock situation, there are multiple processes that are waiting for resources that are held by other processes. For example, process P1 may be holding resource R1 and waiting for resource R2, while process P2 may be holding resource R2 and waiting for resource R1. This situation creates a cycle in the resource-allocation graph, which leads to a deadlock.

Avoiding Deadlock Traffic.

To solve the deadlock situation using the Deadlock Prevention solution, we need to ensure that at least one of the necessary conditions for deadlock does not hold. This can be done by preventing one of the following conditions:

  1. Mutual Exclusion: We can ensure that resources are not mutually exclusive by allowing multiple processes to share the same resource.
  2. Hold and Wait: We can prevent a process from holding resources while waiting for other resources by requiring it to request all the resources it needs at once.
  3. No Preemption: We can allow resources to be preempted from a process that is holding them and allocate them to another process.
  4. Circular Wait: We can impose a total ordering of resources and require that each process requests resources in a specific order.

To solve the deadlock situation using the Deadlock Avoidance solution, we need to use a resource-allocation algorithm that takes into account the possibility of a deadlock. The most commonly used algorithm for deadlock avoidance is the Banker’s algorithm.

The Banker’s algorithm works by keeping track of the available resources, the maximum resources that each process can request, and the resources currently allocated to each process. Based on this information, the algorithm calculates whether granting a request would result in a safe state or not. A safe state is a state in which there is no possibility of a deadlock.

If granting a request would result in an unsafe state, the algorithm will not grant the request, and the process will have to wait. This can lead to some resources being underutilized, but it ensures that deadlock is avoided.

In summary, to solve the traffic issue, we can use the Deadlock Prevention solution by ensuring that at least one of the necessary conditions for deadlock does not hold. Alternatively, we can use the Deadlock Avoidance solution by implementing the Banker’s algorithm, which ensures that the system always remains in a safe state.

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