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Fixed multiple shutdown cleanup bugs in the zone object. This

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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().
This commit is contained in:
Andreas Gustafsson
2000-05-17 19:45:36 +00:00
parent bc436be071
commit 22608315e8
8 changed files with 304 additions and 219 deletions
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12
bin/named/server.c
View File

@@ -524,7 +524,8 @@ configure_view(dns_view_t *view, dns_c_ctx_t *cctx, dns_c_view_t *cview,
* there is no "version" configuration option.
*/
static isc_result_t
create_version_view(dns_c_ctx_t *cctx, dns_view_t **viewp) {
create_version_view(dns_c_ctx_t *cctx, dns_zonemgr_t *zmgr, dns_view_t **viewp)
{
isc_result_t result;
dns_db_t *db = NULL;
dns_zone_t *zone = NULL;
@@ -564,6 +565,7 @@ create_version_view(dns_c_ctx_t *cctx, dns_view_t **viewp) {
CHECK(dns_zone_create(&zone, ns_g_mctx));
CHECK(dns_zone_setorigin(zone, &origin));
CHECK(dns_zonemgr_managezone(zmgr, zone));
CHECK(dns_db_create(ns_g_mctx, "rbt", &origin, ISC_FALSE,
dns_rdataclass_ch, 0, NULL, &db));
@@ -1253,7 +1255,7 @@ load_configuration(const char *filename, ns_server_t *server,
* Create (or recreate) the version view.
*/
view = NULL;
CHECK(create_version_view(cctx, &view));
CHECK(create_version_view(cctx, server->zonemgr, &view));
ISC_LIST_APPEND(lctx.viewlist, view, link);
view = NULL;
@@ -1447,9 +1449,12 @@ shutdown_server(isc_task_t *task, isc_event_t *event) {
dns_dispatch_detach(&server->querysrc_dispatchv6);
ns_clientmgr_destroy(&server->clientmgr);
isc_timer_detach(&server->interface_timer);
ns_interfacemgr_shutdown(server->interfacemgr);
ns_interfacemgr_detach(&server->interfacemgr);
dns_zonemgr_shutdown(server->zonemgr);
dns_zonemgr_detach(&server->zonemgr);
isc_task_detach(&server->task);
@@ -1551,9 +1556,6 @@ ns_server_destroy(ns_server_t **serverp) {
INSIST(ISC_LIST_EMPTY(server->viewlist));
dns_zonemgr_destroy(&server->zonemgr);
server->zonemgr = NULL;
dns_db_detach(&server->in_roothints);
dns_aclenv_destroy(&server->aclenv);