1-explain the semantics of counting semaphores?

2- a platform has space for at most n people at any one time . people are only admitted when the number of person on the platform does not exceed the prescribed limits. usinc a semaphore write a class that could be used to control automated access to rewrd of tge number of people on the platform at any given point in time and must make this value visible through a public method count()

3- what are cyclic barries? give an example of when you might use this type of barries