Let a bounded semaphore s be a general semaphore that cannot exceed a given value smax > 0 . The corresponding operations PB and VB are defined as follows:

PB(s): wait until s > 0; then decrement s by 1 VB(s): wait until s < smax; then increment s by 1.

Using semaphores, write two function PB(s) and VB(s) that emulate the operations on bounded semaphores.