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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 …