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(#M40030382) DBMS Programming question DBMS Keep an EYE

What is a deadlock?

Asked In DBMS MAN (11 years ago)

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Chandni Maurya  (11 years ago)

#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.

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G.Madhumitha  (11 years ago)

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.

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