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gdbusconnection: Make ExportedInterface/ExportedSubtree refcounted

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This is needed for an upcoming change which decouples their lifecycle
from their presence in the `map_id_to_ei` and `map_id_to_es` hash
tables.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

Helps: #2400
This commit is contained in:
Philip Withnall 2021-09-24 09:03:40 +01:00
parent a497fdf302
commit c8c2ed4af5
1 changed files with 38 additions and 8 deletions
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46
gio/gdbusconnection.c
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@ -466,7 +466,8 @@ typedef struct ExportedObject ExportedObject;
static void exported_object_free (ExportedObject *eo); static void exported_object_free (ExportedObject *eo);
typedef struct ExportedSubtree ExportedSubtree; typedef struct ExportedSubtree ExportedSubtree;
static void exported_subtree_free (ExportedSubtree *es); static ExportedSubtree *exported_subtree_ref (ExportedSubtree *es);
static void exported_subtree_unref (ExportedSubtree *es);
enum enum
{ {
@ -1096,7 +1097,7 @@ g_dbus_connection_init (GDBusConnection *connection)
connection->map_object_path_to_es = g_hash_table_new_full (g_str_hash, connection->map_object_path_to_es = g_hash_table_new_full (g_str_hash,
g_str_equal, g_str_equal,
NULL, NULL,
(GDestroyNotify) exported_subtree_free); (GDestroyNotify) exported_subtree_unref);
connection->map_id_to_es = g_hash_table_new (g_direct_hash, connection->map_id_to_es = g_hash_table_new (g_direct_hash,
g_direct_equal); g_direct_equal);
@ -4085,6 +4086,8 @@ typedef struct
{ {
ExportedObject *eo; ExportedObject *eo;
gint refcount; /* (atomic) */
guint id; guint id;
gchar *interface_name; /* (owned) */ gchar *interface_name; /* (owned) */
GDBusInterfaceVTable *vtable; /* (owned) */ GDBusInterfaceVTable *vtable; /* (owned) */
@ -4095,10 +4098,21 @@ typedef struct
GDestroyNotify user_data_free_func; GDestroyNotify user_data_free_func;
} ExportedInterface; } ExportedInterface;
/* called with lock held */ static ExportedInterface *
static void exported_interface_ref (ExportedInterface *ei)
exported_interface_free (ExportedInterface *ei)
{ {
g_atomic_int_inc (&ei->refcount);
return ei;
}
/* May be called with lock held */
static void
exported_interface_unref (ExportedInterface *ei)
{
if (!g_atomic_int_dec_and_test (&ei->refcount))
return;
g_dbus_interface_info_cache_release (ei->interface_info); g_dbus_interface_info_cache_release (ei->interface_info);
g_dbus_interface_info_unref ((GDBusInterfaceInfo *) ei->interface_info); g_dbus_interface_info_unref ((GDBusInterfaceInfo *) ei->interface_info);
@ -4115,6 +4129,8 @@ exported_interface_free (ExportedInterface *ei)
struct ExportedSubtree struct ExportedSubtree
{ {
gint refcount; /* (atomic) */
guint id; guint id;
gchar *object_path; /* (owned) */ gchar *object_path; /* (owned) */
GDBusConnection *connection; /* (unowned) */ GDBusConnection *connection; /* (unowned) */
@ -4126,9 +4142,21 @@ struct ExportedSubtree
GDestroyNotify user_data_free_func; GDestroyNotify user_data_free_func;
}; };
static void static ExportedSubtree *
exported_subtree_free (ExportedSubtree *es) exported_subtree_ref (ExportedSubtree *es)
{ {
g_atomic_int_inc (&es->refcount);
return es;
}
/* May be called with lock held */
static void
exported_subtree_unref (ExportedSubtree *es)
{
if (!g_atomic_int_dec_and_test (&es->refcount))
return;
call_destroy_notify (es->context, call_destroy_notify (es->context,
es->user_data_free_func, es->user_data_free_func,
es->user_data); es->user_data);
@ -5251,7 +5279,7 @@ g_dbus_connection_register_object (GDBusConnection *connection,
eo->map_if_name_to_ei = g_hash_table_new_full (g_str_hash, eo->map_if_name_to_ei = g_hash_table_new_full (g_str_hash,
g_str_equal, g_str_equal,
NULL, NULL,
(GDestroyNotify) exported_interface_free); (GDestroyNotify) exported_interface_unref);
g_hash_table_insert (connection->map_object_path_to_eo, eo->object_path, eo); g_hash_table_insert (connection->map_object_path_to_eo, eo->object_path, eo);
} }
@ -5268,6 +5296,7 @@ g_dbus_connection_register_object (GDBusConnection *connection,
} }
ei = g_new0 (ExportedInterface, 1); ei = g_new0 (ExportedInterface, 1);
ei->refcount = 1;
ei->id = (guint) g_atomic_int_add (&_global_registration_id, 1); /* TODO: overflow etc. */ ei->id = (guint) g_atomic_int_add (&_global_registration_id, 1); /* TODO: overflow etc. */
ei->eo = eo; ei->eo = eo;
ei->user_data = user_data; ei->user_data = user_data;
@ -6924,6 +6953,7 @@ g_dbus_connection_register_subtree (GDBusConnection *connection,
} }
es = g_new0 (ExportedSubtree, 1); es = g_new0 (ExportedSubtree, 1);
es->refcount = 1;
es->object_path = g_strdup (object_path); es->object_path = g_strdup (object_path);
es->connection = connection; es->connection = connection;