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_updThreadC:
forall nextb (ms: dryThreadPool) tid c
(H: containsThread ms tid),
ctl_ok nextb c ->
(forall i (CT: containsThread ms i), ctl_ok nextb (getThreadC CT)) ->
(forall i (CT: containsThread (updThreadC H c) i),
ctl_ok nextb (getThreadC CT)).