DEADLOCK

Chapter 10:-

1. Mutually exclusive is defined as only allowing one process in a critical section at one time. It is serially reusable. The Hold & Wait prevention is to hold a resource and request for another.

2.Circular waiting will do this example:-

Process 1 hold resource 1 and ask for resource 2. While Process 2 hold on to Resource 2 and ask for Resource 1

3. No pre-emption is when a process ask for a resource and the resource is not available. Then it cannot withdraw its request and must complete it.

4. Handling deadlocks :-

- Ignore => Since it does not happen frequently

- Detect and Recover => Detection / or recovery process

- Prevent => Eliminating possibility of deadlock by designing deadlock out of the OS. This remove mutual exclusion , allow pre-emption of resources, disallow partial allocation of resources and do not permit circular waiting.

- Avoid => Allow potential deadlock, check berfore allocating resorces.