Determining when code finished execution when using duk_suspend

[angrymouse]

Hello! How do I understand when evaluated code finished its execution?
When I just execute duk_eval_string, it's obvious - after duk_eval_string call is finished, however when I try to use duk_suspend on ctx, duk_eval_string is finished right away, not waiting until duk_resume. How do I understand execution is done after all suspends/resumes?