(a) A machine 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 Lis 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.