Locking from primitives

Am a Beginner, so excuse if something is silly.

A friend was asked a question in an interview.
Given atomic increment & decrement operations
how would one implement locking functions?

I tried various ways, but can't arrive at a working
solution.

Is this problem solvable? Are there any extra
operations one would need?

If not, can some one give me a solution or hints
about the direction in which I can attack the problem.


.

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