(* PERSONAL MEM: Is the contents of the global memory,
       with the juice of a single thread and the Cur that corresponds to that juice.*)
    Definition acc_coh:= fun m phi pr => @max_acc_coh_acc_coh m phi (max_coh pr).Definition personal_mem {m phi} (pr : mem_cohere' m phi) : juicy_mem:=
      mkJuicyMem
        (@juicyRestrict phi m (acc_coh pr))
        phi
        (juicyRestrictContentCoh (acc_coh pr) (cont_coh pr))
        (juicyRestrictAccCoh (acc_coh pr))
        (juicyRestrictMaxCoh (acc_coh pr) (max_coh pr))
        (juicyRestrictAllocCoh (acc_coh pr) (all_coh pr)).Definition juicy_sem := (FSem.F _ _ JuicyFSem.t) _ the_sem.(* Definition juicy_step := (FSem.step _ _ JuicyFSem.t) _ _ the_sem. *)

    Program Definition first_phi (tp : thread_pool) : rmap := (@getThreadR _ _ _ 0%nat tp _).Program Definition level_tp (tp : thread_pool) := level (first_phi tp).Definition tp_level_is_above n tp :=
      (forall i (cnti : containsThread tp i), le n (level (getThreadR cnti))) /\
      (forall i R phi, lockRes(resources:=LockInvsAndResources) tp i = Some (R, Some phi) -> le n (level phi)).Definition tp_level_is n tp :=
      (forall i (cnti : containsThread tp i), level (getThreadR cnti) = n) /\
      (forall i R phi, lockRes(resources:=LockInvsAndResources) tp i = Some (R, Some phi) -> level phi = n).Definition cnt_from_ordinal tp : forall i : ordinal (pos.n (num_threads tp)), containsThread tp i.Definition age_tp_to (k : nat) (tp : thread_pool) : thread_pool :=
      match tp with
        mk n pool maps lset =>
        mk n pool
           ((age_to k) oo maps)
           (AMap.map (fun '(R, r) => (R, option_map (age_to k) r)) lset)
      end.

Lemma join_all_age_to k tp Phi : le k (level Phi) -> join_all tp Phi -> join_all (age_tp_to k tp) (age_to k Phi).