Deadlock Basics

Are you Ready...!

• Yes

• No

The resources can be classified into

• Logical & Personal

• Physical & Logical

• Fixed and Flexible

• Uniform & Distributed

Identify the right order for any resource

• Request

  Release

  Use

• Release

  Request

  Use

• Use

  Request

  Release

• Request

  Use

  Release

Identify the logical resource

• Printer

• Tape drive

• semaphore

• DVD

A deadlock is a situation where a set of processes are ________

• sharing resources

• executing faster

• Blocked

• Helping eachother

Necessary conditions for deadlock

• 3

• 4

• Any one of the 4

• No such condition

Identify the necessary conditions not leading to deadlock

• No-preemption

• Resource sharing

• Circular wait

• Hold and wait

Can we achieve mutual exclusion on the printer?

• Yes

• No

If P1 process is holding some resources and waiting for a resource held by process P2, which cannot be immediately allocated to it, then all resources currently P1 being held are released.

What is happening here?

• Mutual Exclusion

• Hold & Wait

• Circular wait

• Preemption

Identify the right statement

• Deadlock is a safe state and cannot have a safe sequence.

• Deadlock is an unsafe state. In the unsafe state we can't have a safe sequence.

• All Unsafe states are deadlocks

• If a system is deadlocked. It will have safe sequence.