Constructs a semaphore that initially has init Semaphore.post actions.

Posts, waits, or polls a semaphore. When Semaphore.poll successfully waits on a semaphore, it returns #true, otherwise it returns #false.

The Semaphore.handle property accesses a semaphore object’s underlying Racket representation. The Semaphore.from_handle function constructs a Rhombus semaphore object from a Racket semaphore object.