| University | University Of Canterbury (UC) |
| Subject | Programming |
The program will create a thread for each lift and for each person in the building. Lifts go up and down picking people up and taking them to where they want to go.
Each person starts on a certain floor (from) and thinks of a random floor they want to go to (to). Then they wait for a lift going in the correct direction by waiting on a semaphore (up_a arrow or down_a r row) associated with the floor they are on (from). When a lift signals this semaphore, the person will get into the lift, possibly press the button for the floor they want to go to, and wait for the lift to arrive at their destination floor (to) by waiting on another semaphore. When they reach their destination they will get out, wait for a while and then start another journey.
There are two semaphores for each floor, one for people going up and one for people going down. In each lift, there is a semaphore for each floor. The people in the lift can wait on these before getting in or out of the lift.
Each floor in the building is described by the following data structure with two semaphores that people can wait on — up_a r row and down_a r row.
Each lift in the building is described by the following data structure which has one semaphore for each floor that the passengers inside can wait on.
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