In this part, you need to modify your solution in part I so that only the eastbound vehicles cross the bridge for a specific time interval (15 seconds) and then only the westbound vehicles cross the bridge for the same time interval. This action should be repeated forever. Here, you may need to add two semaphores that control the eastbound and westbound vehicles. When the eastbound semaphore is ON, then the westbound semaphore must be OFF, and vice versa. You may also need to add a timer thread at both directions that sleep for 15 seconds and then in someway causes in changing the values of the two semaphores. The next figure describes the problem of crossing a one-line bridge with the new requirements. Please note that you must keep the solution of part I and take a copy of it to do the required modification on it. see image.
Output sample for part II:
Please note that your output result might be different. see image.