$6\mathrm{.}10$ The compare$\_$and$\_$swap$()$ instruction can be used to design lock$-$free

data structures such as stacks, queues, and lists. The program example

shown in Figure $6\mathrm{.}17$ presents a possible solution to a lock$-$free stack

using CAS instructions, where the stack is represented as a linked list

of Node elements with top representing the top of the stack. Is this

implementation free from race conditions?