4. Svnchronization: warmup This problem is based on the following code (which is similar to Problem 4 of Homework 2) int i = 0; :* ADD SOME THINGS HERE */ void foo(void *) printf("I am foo!! ! "); ADD SOME CODE HERE / void boo(void *) ADD SOME CODE HERE printf("I am boo!! !n); int main(int argc, char** argv) create_thread (foo); create_thread (boo) // wait for threads to finish // before exiting join_thread(foo); join_thread(boo); exit (e); Modify the code above to ensure that I am foo!!! prints before I am boo!!!. Use mutexes and condition variables