RajeswariKnowledge Contributor									
															
						Four necessary conditions for deadlock to exist are: mutual exclusion, no-preemption, circular wait and
													Four necessary conditions for deadlock to exist are: mutual exclusion, no-preemption, circular wait and												
												
												
		
                    
The four necessary conditions for a deadlock situation are mutual exclusion, no preemption, hold and wait and circular set. There are four methods of handling deadlocks – deadlock avoidance, deadlock prevention, deadline detection and recovery and deadlock ignorance.