Deadlock questions and answers pdf

1. What is deadlock interview questions?
2. What is deadlock answer?
3. What is deadlock example?
4. What is a deadlock and how can it be avoided?
5. What causes deadlock?
6. How can a deadlock be prevented?
7. How many processes are required for deadlock?
8. Which algorithm is used for deadlock detection?
9. How many processes can be deadlocked with each other?
10. What are the four conditions of deadlock?
11. What are the seven cases of deadlock?

What is deadlock interview questions?

Interview questions start with, "What is a deadlock?" The answer is simple when two or more threads are waiting for each other to release the resource they need (lock) and get stuck for infinite time, the situation is called deadlock. It will only happen in the case of multitasking or multi-threading.

What is deadlock answer?

Deadlock is a situation that occurs in OS when any process enters a waiting state because another waiting process is holding the demanded resource. Deadlock is a common problem in multi-processing where several processes share a specific type of mutually exclusive resource known as a soft lock or software.

What is deadlock example?

Deadlock is defined as a situation where set of processes are blocked because each process holding a resource and waiting to acquire a resource held by another process. Example: when two trains approach each other at a crossing, both shall come to a full stop and neither shall start up again until the other has gone.

What is a deadlock and how can it be avoided?

In order to avoid deadlock, you have to acquire a lock in the fixed order. ... Once process1 commits the transaction successfully, it will release the locks on the resources; therefore process 2 will get the required resources in order to complete the transaction successfully without getting into the deadlock.

What causes deadlock?

A deadlock happens when two (or more) transactions block each other by holding locks on resources that each of the transactions also need. For example: Transaction 1 holds a lock on Table A. ... Deadlocks can involve more than two transactions, but two is the most common scenario.

How can a deadlock be prevented?

Deadlock prevention works by preventing one of the four Coffman conditions from occurring. Removing the mutual exclusion condition means that no process will have exclusive access to a resource. This proves impossible for resources that cannot be spooled. But even with spooled resources, the deadlock could still occur.

How many processes are required for deadlock?

Two processes competing for two resources in opposite order. A single process goes through. The later process has to wait. A deadlock occurs when the first process locks the first resource at the same time as the second process locks the second resource.

Which algorithm is used for deadlock detection?

The Banker's algorithm is a resource allocation and deadlock avoidance algorithm developed by Edsger Dijkstra. This prevents a single thread from entering the same lock more than once.

How many processes can be deadlocked with each other?

So any deadlock must have at least four participating processes. To participate in a deadlock, a process must hold at least one resource. Further, a process cannot hold more than two resources so a process that currently has two resources can definitely run until it frees at least one of those resources.

What are the four conditions of deadlock?

Conditions for Deadlock- Mutual Exclusion, Hold and Wait, No preemption, Circular wait. These 4 conditions must hold simultaneously for the occurrence of deadlock.

What are the seven cases of deadlock?

7 Seven Cases of Deadlocks  Non-sharable /non-preemptable resources –Allocated to jobs requiring same type of resources  Resource types locked by competing jobs –File requests –Databases –Dedicated device allocation –Multiple device allocation –Spooling –Disk sharing –Network Homework: Read about these cases in the ...