Implement a mutex using the atomic swap(variable, register) instruction in x86. your mutex can use busy-spin. but assume that youcannot access a register directly other than using this swap instruction. (note insome lecture, we solved this problem with direct access to the register allowed. for instance, you could simply write $register = 1. but you are not allowed to dothat directly. you must do the following: int x = 1; swap (x, $reg) .