Change the sense-reversing barrier implementation so that waiting threads call wait () instead of spinning.

 Give an example of a situation where suspending threads is better than spinning.

 Give an example of a situation where the other choice is better.

1 2 3 4 5 6 7 8 9 class prefix extends java.lang. Thread { private int[] a; private int i; public Prefix(int[] myA, int myI) { a = myA; myI; i } public void run () { int d 1, sum = 0; while (d = d) sum = a[i-d]; if (i >d) a[1] += sum; d = d * 2;