$3)[4$ Points$]$ Synchronization $($Double Ping$-$Pong Problem$)$ The rules state that in a double ping$-$pong game the two players in a team must play the ball in strict alternation, for example: Ping$1-->$ Pong$1-->$ Ping$2-->$ Pong$2-->$ Ping$1,$ etc. Write $4$ threads Ping$1,$ Ping$2,$ Pong$1,$ and Pong$2$ that display alternatively a message on the console as presented earlier. Use semaphores to synchronize between the different threads.