Instance CompSpecs : compspecs.Definition Vprog : varspecs.Definition acquire_spec := DECLARE _acquire acquire_spec.Definition release_spec := DECLARE _release release_spec.Definition makelock_spec := DECLARE _makelock (makelock_spec _).Definition freelock_spec := DECLARE _freelock (freelock_spec _).Definition spawn_spec := DECLARE _spawn spawn_spec.Definition freelock2_spec := DECLARE _freelock2 (freelock2_spec _).Definition release2_spec := DECLARE _release2 release2_spec.Definition thread_lock_R sh ctr lockc :=
  lock_inv sh lockc (cptr_lock_inv ctr).Definition thread_lock_inv sh ctr lockc lockt :=
  selflock (thread_lock_R sh ctr lockc) sh lockt.

Lemma ctr_inv_exclusive : forall p, exclusive_mpred (cptr_lock_inv p).