Function expire_callout

freebsd/net/route/route_temporal.c:83–116

* Per-rnh callout function traversing the tree and deleting * expired routes. Calculates next callout run by looking at * the rt_expire time for the remaining temporal routes. */

 * the rt_expire time for the remaining temporal routes.
 */
static void
expire_callout(void *arg)
{
	struct rib_head *rnh;
	time_t next_expire;
	int seconds;

	rnh = (struct rib_head *)arg;

	CURVNET_SET(rnh->rib_vnet);
	next_expire = 0;

	rib_walk_del(rnh->rib_fibnum, rnh->rib_family, expire_route,
	    (void *)&next_expire, 1);

	RIB_WLOCK(rnh);
	if (next_expire > 0) {
		seconds = (next_expire - time_uptime);
		if (seconds < 0)
			seconds = 0;
		callout_reset_sbt(&rnh->expire_callout, SBT_1S * seconds,
		    SBT_1MS * 500, expire_callout, rnh, 0);
		rnh->next_expire = next_expire;
	} else {
		/*
		 * Before resetting next_expire, check that tmproutes_update()
		 * has not kicked in and scheduled another invocation.
		 */
		if (callout_pending(&rnh->expire_callout) == 0)
			rnh->next_expire = 0;
	}
	RIB_WUNLOCK(rnh);
	CURVNET_RESTORE();
}

/*
 * Function responsible for updating the time of the next calllout