Deadlock

Deadlock is a situation in which the processes waits for the other resource which is occupied by another process in a loop for example take processes P1 and P2 and resources R1 and R2 in the deadlock condition

        P1 -R1 waits for R2

        P2 -R2 waits for R1 

so both processes waits for the other resource to get free for their complete operation.

In such cases - One can avoid deadlocks by following methods

1) Prevention

2) Detection

3) Avoidance

4) Recovery