Welcome to our deep dive into Resource Allocation Graphs! In this video, we'll explore the essential concepts behind Resource Allocation Graphs, a fundamental tool in understanding and managing resources in computer systems and networks.

You'll learn:

What a Resource Allocation Graph (RAG) is and why it's important.
How to construct and interpret a RAG.
The role of RAGs in detecting deadlocks and ensuring efficient resource management.
Practical examples and step-by-step demonstrations to solidify your understanding.
Whether you're a student, an IT professional, or just curious about computer science, this video will provide you with valuable insights into resource allocation and deadlock prevention.

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#Chapter4
#Deadlock
#ResourceAllocationGraph
#SingleInstanceResourceAllocationGraph
How the resources are allocated to process and how the process have been assigned to multiple resource to represent that we use resource allocation graph (RAG)
In our system deadlock is present or not, to represent that this is the most suitable way.
Like any other graph it also has vertex and edges.
All the processes running in our system are represented as vertex and generally represented as circle.
All the resources in our system are represented by vertex, but with rectangle box.
Edges are of two types assign edge. If the arrow is going from resource to process than it means resource is allocated to that process.
Request edge if arrow is going from process to resource it means process is asking for resource.
Let's see some examples to get better understanding of the concept.

Example 1: Resource R1 is allocated to process P1 and R2 to P2, P1 wants R2 and P2 wants R1. Check whether there is a deadlock present or not.

We do this kind of representation to check that whether there is a deadlock condition or not.

Another and recommended way to check the presence of deadlock.
Current availability: (0,0)
Here P1 wants one R2 and P2 wants one R1, but as we can see the availability, we cannot fulfill the request which means that deadlock is present.
It has circular wait.
If RAG has circular wait (cyclic), then there will always be deadlock in case of single instance.
Example 2: From the given RAG find out that is deadlock present in this case.

Current availability: (0,0)
We can full fill the availability of P1 and P2 because they are not requesting for any resource, so they will get terminated after some time and then the new availability will be.
Current availability: (1,1)
By this new availability we can fulfill the request of P3 and then it will also get terminated after execution.
So, no deadlock is present in this example.
This is acyclic because by following arrows we cannot come back to that point again.
If RAG has no cycle then there will be no deadlock in the case of single instance.

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