Need help with number 2!

4. Synchronization (26 points) two threads that run concurrently. The code for the two threads are follows The process has ads are s hown as Thread A: (Al) yl=x; (A2) yl -yl +1; (A3) x=yl; Thread B: (BI) y2 =x; (B2) y2 - y2+ 2 (B3) x- y2; Suppose x is a global variable shared by the two threads and is initialized to 0. 1) ution. List all the possible Also briefly explain how x gets each of the values you listed at the end of execution. (hint: think about the execution orders of A1-A3 and B1-B3) Alurocessg cess is revrredl 2) To eliminate the potential data races in the above case, how do you modify the code of thread A and B? Given that you have a binary semaphore:,mutex, which is ly initialized to 1 and two operations, wait (or down, P) and or t