Not a necessary condition of deadlock.

Question

Which of the following is not a necessary condition(s) for a deadlock?

1.Mutual Exclusion
2.Hold and wait
3.No pre-emption
4.Re-entrancy

Comments

D) re entrancy ..

http://www.geeksforgeeks.org/reentrant-function/

Answer 1

The necessary condition for DL is: mutual exclusion, hold and wait and no preemption.

when we add Circular wait it's necessary and sufficient condition for Deadlock.

so option D is correct, more on option D in detail plz refer the comment section.