In a barber shop there are 2 doors. customer come in 1
door, leave in other. minimum # of chairs. barber spend his
life in cutting. always barber can cut 1 customer. few
chairs in the shop. if barber busy customer waits, if
chairs full, customer leave. if no customer, barber sleeps.
treat barber and customer as 2 threads. you can use
Semaphore class with arrive and depart and count as
parameter.
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