Concurrent and Parallel Programming

Class MyList given below uses a binary Semaphore to make the methods set and inc thread safe. The solution uses coarse-grained synchronization. Re-write the class using semaphores to provide a fine-grained synchronized solution that makes the class thread safe. class MyList{ private int[] list = new int[100]; private Semaphore lock = new Semaphore(1); MyList(){ for(int j = 0; j < 100; j++) list[j] = (int)(Math.random()*100); } public void set(int x, int ind){ //assume 0 <= ind < 100 try{lock.acquire();} catch(InterruptedException e){} list[ind] = x; lock.release(); } public void inc(int x, int ind){//assume 0 <= ind < 100 try{lock.acquire();} catch(InterruptedException e){} list[ind] += x; lock.release(); } }