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Andreas Gustafsson authored
involved extensive restructuring of the reference counting of zones and related objects. Zones now attach to their views. To avoid a circular dependency that would keep views from ever shutting down, this is done using the new functions dns_view_weakattach() / dns_view_weakdetach() which guarantee that the view will not be freed but still allow it to be shut down. The zones themselves now only have a single reference count, with similar "weak" semantics. Managed zones must now be shut down explicitly by calling dns_zone_shutdown(). To shut down all zones in a zone table, call dns_zt_shutdown(). The zone manager is now reference counted, weakly. To shut down the zone manager, you must explicitly call dns_zonemgr_shutdown().
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