Question: Sometimes it is necessary to synchronize two or more processes so that all processes must finish their first phase before any of them is allowed

Sometimes it is necessary to synchronize two or more processes so that all processes must finish their first phase before any of them is allowed to start its second phase. This is called Barrier synchronization.

For two processes, we might write:

process P1{ V(s1) P(s2) }

process P2{ V(s2) P(s1) }

--> Give a solution to the problem for three processes P1, P2, and P3.

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