Function in_pcbref

freebsd/netinet/in_pcb.c:1652–1659

* in_pcbref() bumps the reference count on an inpcb in order to maintain * stability of an inpcb pointer despite the inpcb lock being released. This * is used in TCP when the inpcbinfo lock needs to be acquired or upgraded, * but where the inpcb lock may already held, or when acquiring a reference * via a pcbgroup. * * in_pcbref() should be used only to provide brief memory stability, and

 * using in_pcbrele().
 */
void
in_pcbref(struct inpcb *inp)
{

	KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));

	refcount_acquire(&inp->inp_refcount);
}

/*
 * Drop a refcount on an inpcb elevated using in_pcbref(); because a call to