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The Wash$-$O$-$Matic Laundromat is a computerized laundry reservation system. As each customer enters, he or she puts coins into slots at one of two stations and types in the number of washing machines he$/$she will need. The stations are connected to a central computer that automatically assigns available machines and outputs tokens that identify the machines to be used. The customer puts laundry into the machines and inserts each token into the machine indicated on the token. When a machine finishes its cycle, it informs the computer that it is available again. The computer maintains an array available$[$NMACHINES$]$ whose elements are non$-$zero if the corresponding machine is available; NMACHINES is a constant equal to the number of machines there are in the Laundromat, and nfree is a semaphore that indicates the number of available machines.

The code to allocate and release machines is as follows: