What is a deadlock?

• #A set of blocked processes each holding a resource and waiting to acquire a resource held by another process in the set.
  #Example
  ->System has 2 tape drives.
  ->P1 and P2 each hold one tape drive and each needs another one.
  
  #Deadlock can arise if four conditions hold simultaneously
  1.Mutual exclusion: only one process at a time can use a resource.
  2.Hold and wait: a process holding at least one resource is waiting to acquire additional resources held by other processes.
  3.No preemption: a resource can be released only voluntarily by the process holding it, after that process has completed its task.
  4.Circular wait: there exists a set {P0, P1, …, P0} of waiting processes such that P0 is waiting for a resource that is held by P1, P1 is waiting for a resource that is held by
  P2, …, Pn–1 is waiting for a resource that is held by Pn, and P0 is waiting for a resource that is held by P0.
  
  
• 11 years agoHelpfull: Yes(4) No(0)
• A deadlock is a condition in which two or more process in a set are simultaneously waiting for the resource held by some other process which itself is in a waiting state.
• 11 years agoHelpfull: Yes(2) No(0)