Please answer with full steps: no wrong chegg previous answers please.

Explain thank you, will upvote.

USING THESE API:

Sem_init (&s,1,X)

sem_wait(s)

sem_post(s)

Three concurrent processes P1,P2, and P3 are running concurrently. Each process Pi among other code segments, invokes a function Ai() only once during its execution as shown below: P3 We want to make sure that A1() can start to execute only when both A2() and A3() have fully completely. Show how you can solve this problem using semaphores. Make sure to indicate the initial values of all your semaphore. API: Sem_init (&s,1,X) Sem_wait (s) Sem_post (s) (Please denote your modifications clearly in the above code lines.)