Question: Why do we need to define a doorway section, and why cannot we define FCFS in a mutual exclusion algorithm based on the order in

Why do we need to define a doorway section, and why cannot we define FCFS in a mutual exclusion algorithm based on the order in which the first instruction in the lock() method was executed? Argue your answer in a case-by- case manner based on the nature of the first instruction executed by the lock(): a read or a write, to separate locations or the same location.

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