Consider an event facility that has a 100-person capacity where the number of persons cannot exceed 100 at any time. There are 2 gates, G1, an entry gate (cannot be used to exit) and G2, an exit gate (cannot be used to enter). G1 and G2 use a turnstile type of gate so that only one person can use at any time when enabled. Two APIs are available in the system: G1_permit_one() and G2_permit_one(). When called, G1_permit_one() will enable the turnstile to allow exactly one person to enter. Similarly, when called, API G2_permit_one() will enable the turnstile to allow exactly one person to exit. There are two processes: manage_G1 and manage_G2 that share variables between them. Also available are two semaphores s_arrive and s_depart, both initialized to 0. When a person arrives at the entry gate (wanting to enter the facility) a sensor placed at the entry gate executes signal(s_arrive). Similarly, when a person arrives at the exit gate (wanting to exit the facility), a sensor placed at exit gate executes signal(s_depart).
These are given.
Code the two processes manage_G1 and manage_G2.