Mention the various features that characteristics the deadlock condition.

 The four circumstances that give rise to deadlock condition are:

1) Mutual exclusion: As a minimum one resource must be held in the non-sharable mode that is only one process is able to be used at a time. If another process demand for the resource it should wait.

2) Hold and wait: A process should be holding at least one resource and wait for other process to give the resource to it.

3) No preemption: Resources not able to be preempted; it cannot be taken from one process with force.

4) Circular wait: Assume consider a set of process {p₁, p₂, p₃.......} in the waiting queue such that p₁ is waiting for the resource held by process p₂ etc.