(*TODO: Move to ev_semantics*)
    Definition in_free_list (b : block) ofs xs :=
      exists x, List.In x xs /\
           let '(b', lo, hi) := x in
           b = b' /\
           (lo <= ofs < hi)%Z.

Lemma suspend_thread_det: forall tp m tid (cnt: containsThread tp tid) tp' tp'' (Hsuspend: suspend_thread m cnt tp') (Hsuspend': suspend_thread m cnt tp''), tp' = tp''.