Function ipsec_kmod_drain

freebsd/netipsec/subr_ipsec.c:154–165

}

static void
ipsec_kmod_drain(volatile u_int *cntr)
{
	u_int old, new;

	do {
		old = *cntr;
		new = old & ~IPSEC_MODULE_ENABLED;
	} while (atomic_cmpset_acq_int(cntr, old, new) == 0);
	while (atomic_cmpset_int(cntr, 0, 0) == 0)
		pause("ipsecd", hz/2);
}

static LIST_HEAD(xforms_list, xformsw) xforms = LIST_HEAD_INITIALIZER();
static struct mtx xforms_lock;