Wireless Distribution System operating question

My question is about the WDS working mode.... In particular mode what I need is:

WDS is not including automatically the STP or the RSTP........and usually the AP that are supporting the WDS needs to define also all the MAC addresses of the others AP that are supporting WDS and that are working on the same channel with the goal to have a complete WDS structure. But, what should happen if there are 3 AP and each one can reach the other ones. Theoretically I have a loop that only STP is able to fix....
to fix ideas I have 3 AP called A,B,C and installed to create a triangle. And I'm using omni-directional antennas.
So, when I fill the mac-addresses list I will do something like that:
- On Access Point B I will write mac-addresses of A and C.
- On Access Point A I will write mac address of B but not C
- On Access Point C I will write mac-address of B but not A.

Theroretically in this way I will not have a communication between A and C.........is it correct?
What happen when packets coming from C reach A and viceversa? Do I have or not a loop? Will those packets be dropped, or not ?

Please, if my question it's not so clear I ask you to request me to re-write the question. Thanks.