7.35- Necessary Conditions For Deadlock | Mutual Exclusion | No Preemption | DBMS Free Online Course
7.35- Necessary Conditions For Deadlock | Mutual Exclusion | No Preemption | DBMS Free Online Course
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Deadlocks
A system is said to be in deadlock state if there exist a set of transactions {T0, T1,..., Tn} such that each transaction in set is waiting for releasing any resource by any other transaction in that set. In this case, all the transactions are in waiting state.
Necessary Conditions for Deadlock
A system is in deadlock state if it satisfies all of the following conditions.
(i) Hold and wait : Whenever a transaction holding at least one resource and waiting for another resources that are currently being held by other processes.
(ii) Mutual Exclusion : When any transaction has obtained a nonsharable lock on any data item and any other transaction requests that item.
(iii) No Preemption : When a transaction holds any resource even after its completion.
(iv) Circular Wait : Let T be the set of waiting processes T = {T0, T1, ..., Ti
} such that T0 is waiting for a resource that is held by T1, T1 is waiting for a resource that is held by T2, Ti is waiting for a resource that is held by T0.