How to achieve atomicity (all or nothing)?

Questions & Help Questions
1

Suppose I have two states. In C, I can mutate them atomically (either all or none are mutated) using locks:

bool atomic_mutation() {
  lock(state1_lock);
  lock(state2_lock);

  bool success = mutate1(state1);
  if (!success) {
    unlock(state1_lock);
    unlock(state2_lock);
    return false;
  }

  success = mutate2(state2);
  if (!success) {
    // revert mutate1(state1)
    unlock(state1_lock);
    unlock(state2_lock);
    return false;
  }

  unlock(state1_lock);
  unlock(state2_lock);
  return true;
}

I’m new to Elixir. What I’ve learned is that I normally use an Agent to manage a state. But how to achieve atomicity shown above in Elixir? Thanks!

Edit: I fixed the bug in the C code above as pointed out by @al2o3cr