Hi，Ruben
I think the fork join none will create a thread to carry the wait_and_decrement_counter if the mbx_data.decrement_counter = 1；
but it factly will carry this wait_and_decrement_counter task after the main thread counter a function or task，so the first wait_and_decrement_counter task will carried after the second my_mbx.get(mbx_data) function， so the mbx_data will be updated , i suggest you add a `uvm_info after the “none” key word
by the way, i want to know how long can get a full access account?
i am a student.
thanks so much