Function knlist_add

freebsd/kern/kern_event.c:2301–2319

* add a knote to a knlist */

 * add a knote to a knlist
 */
void
knlist_add(struct knlist *knl, struct knote *kn, int islocked)
{

	KNL_ASSERT_LOCK(knl, islocked);
	KQ_NOTOWNED(kn->kn_kq);
	KASSERT(kn_in_flux(kn), ("knote %p not in flux", kn));
	KASSERT((kn->kn_status & KN_DETACHED) != 0,
	    ("knote %p was not detached", kn));
	if (!islocked)
		knl->kl_lock(knl->kl_lockarg);
	SLIST_INSERT_HEAD(&knl->kl_list, kn, kn_selnext);
	if (!islocked)
		knl->kl_unlock(knl->kl_lockarg);
	KQ_LOCK(kn->kn_kq);
	kn->kn_knlist = knl;
	kn->kn_status &= ~KN_DETACHED;
	KQ_UNLOCK(kn->kn_kq);
}

static void
knlist_remove_kq(struct knlist *knl, struct knote *kn, int knlislocked,