Definition mem_ok (tp: dryThreadPool) m := 
   Smallstep.globals_not_fresh (Clight.genv_genv ge) m /\
   mem_wd2 m /\
  (forall i (CT: containsThread tp i),
      ctl_ok (Mem.nextblock m) (getThreadC CT)).

Lemma ctl_ok_updLockSet: forall nextb (ms: dryThreadPool) tid x r (H: containsThread ms tid), (forall i (CT: containsThread ms i), ctl_ok nextb (getThreadC CT)) -> (forall i (CT: containsThread (updLockSet ms x r) i), ctl_ok nextb (getThreadC CT)).