Resource deadlock

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Four conditions must hold for there to be a resource deadlock :

Mutual exclusion condition. Each resource is either currently assigned to exactly one process or is available.

Hold-and-wait condition. Processes currently holding resources that were granted earlier can request new resources.

No-preemption condition. Resources previously granted cannot be forcibly taken away from a process. They must be explicitly released by the process holding them.

Circular wait condition. There must be a circular list of two or more processes, each of which is waiting for a resource held by the next member of the chain.