Amachine instruction swap(r, x) interchanges the contents of the register r and the memory location x in one instruction cycle. implement the pb and vb operations on binary semaphore using swap. (b) a machine instruction test-set-branch, tsb(x, l), where x is a memory location and l is a branch label, performs the following function in one instruction cycle: if (x == 0) branch to l else x = 0 implement the pb and vb operations on binary semaphore using tsb .