What is the x86 “ret” instruction equivalent to?

Question

Say I\'m writing a routine in x86 assembly, like, \"add\" which adds two numbers passed as arguments.

For the most part this is a very simple method:

Answer 1

This is possible to make the return_address an array of dwords and let each thread access return_address at an unique index computed by an one to one injective function of it's unique identifier.

This change makes nrz's accepted answer works also for multithreaded code as well!