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In OS, a deadlock is where two or more processes are waiting indefinitely for an event that can be caused by one of the waiting processes. Deadlock is a common problem in distributed systems, parallel computing & multiprocessing systems.

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Why unsafe state not always cause deadlock?

the same line here If a safe sequence does not exist, then the system is in an unsafe state, which MAY lead to deadlock. ( All safe states are deadlock free, but not all unsafe states lead to deadlocks
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