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GDBusProxy: Add locking and notes/guarantees about MT safety

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This was discussed in

 https://bugzilla.gnome.org/show_bug.cgi?id=651133

Signed-off-by: David Zeuthen <davidz@redhat.com>
This commit is contained in:
David Zeuthen 2011-05-26 09:54:47 -04:00
parent 7e0f890e38
commit c0f4a63c89
1 changed files with 44 additions and 4 deletions
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48
gio/gdbusproxy.c
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@ -75,11 +75,20 @@
* way of working with proxies is to subclass #GDBusProxy, and have
* more natural properties and signals in your derived class.
*
* A #GDBusProxy instance can be used from multiple threads but note
* that all signals (e.g. #GDBusProxy::g-signal, #GDBusProxy::g-properties
* and #GObject::notify) are emitted in the
* <link linkend="g-main-context-push-thread-default">thread-default main loop</link>
* of the thread where the instance was constructed.
*
* See <xref linkend="gdbus-example-proxy-subclass"/> for an example.
*
* <example id="gdbus-wellknown-proxy"><title>GDBusProxy for a well-known-name</title><programlisting><xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gdbus-example-watch-proxy.c"><xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback></xi:include></programlisting></example>
*/
/* lock protecting the properties GHashTable */
G_LOCK_DEFINE_STATIC (properties_lock);
/* ---------------------------------------------------------------------------------------------------- */
G_LOCK_DEFINE_STATIC (signal_subscription_lock);
@ -633,6 +642,8 @@ g_dbus_proxy_get_cached_property_names (GDBusProxy *proxy)
g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL);
G_LOCK (properties_lock);
names = NULL;
if (g_hash_table_size (proxy->priv->properties) == 0)
goto out;
@ -648,6 +659,7 @@ g_dbus_proxy_get_cached_property_names (GDBusProxy *proxy)
names = (gchar **) g_ptr_array_free (p, FALSE);
out:
G_UNLOCK (properties_lock);
return names;
}
@ -698,6 +710,8 @@ g_dbus_proxy_get_cached_property (GDBusProxy *proxy,
g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL);
g_return_val_if_fail (property_name != NULL, NULL);
G_LOCK (properties_lock);
value = g_hash_table_lookup (proxy->priv->properties, property_name);
if (value == NULL)
{
@ -709,6 +723,7 @@ g_dbus_proxy_get_cached_property (GDBusProxy *proxy,
g_variant_ref (value);
out:
G_UNLOCK (properties_lock);
return value;
}
@ -765,6 +780,8 @@ g_dbus_proxy_set_cached_property (GDBusProxy *proxy,
g_return_if_fail (G_IS_DBUS_PROXY (proxy));
g_return_if_fail (property_name != NULL);
G_LOCK (properties_lock);
if (value != NULL)
{
info = lookup_property_info_or_warn (proxy, property_name);
@ -790,7 +807,7 @@ g_dbus_proxy_set_cached_property (GDBusProxy *proxy,
}
out:
;
G_UNLOCK (properties_lock);
}
/* ---------------------------------------------------------------------------------------------------- */
@ -849,6 +866,7 @@ on_signal_received (GDBusConnection *connection,
/* ---------------------------------------------------------------------------------------------------- */
/* must hold properties_lock */
static void
insert_property_checked (GDBusProxy *proxy,
gchar *property_name,
@ -930,6 +948,8 @@ on_properties_changed (GDBusConnection *connection,
if (g_strcmp0 (interface_name_for_signal, proxy->priv->interface_name) != 0)
goto out;
G_LOCK (properties_lock);
g_variant_iter_init (&iter, changed_properties);
while (g_variant_iter_next (&iter, "{sv}", &key, &value))
{
@ -943,6 +963,8 @@ on_properties_changed (GDBusConnection *connection,
g_hash_table_remove (proxy->priv->properties, invalidated_properties[n]);
}
G_UNLOCK (properties_lock);
/* emit signal */
g_signal_emit (proxy, signals[PROPERTIES_CHANGED_SIGNAL],
0,
@ -966,6 +988,7 @@ process_get_all_reply (GDBusProxy *proxy,
GVariantIter *iter;
gchar *key;
GVariant *value;
guint num_properties;
if (!g_variant_is_of_type (result, G_VARIANT_TYPE ("(a{sv})")))
{
@ -974,6 +997,8 @@ process_get_all_reply (GDBusProxy *proxy,
goto out;
}
G_LOCK (properties_lock);
g_variant_get (result, "(a{sv})", &iter);
while (g_variant_iter_next (iter, "{sv}", &key, &value))
{
@ -983,8 +1008,11 @@ process_get_all_reply (GDBusProxy *proxy,
}
g_variant_iter_free (iter);
num_properties = g_hash_table_size (proxy->priv->properties);
G_UNLOCK (properties_lock);
/* Synthesize ::g-properties-changed changed */
if (g_hash_table_size (proxy->priv->properties) > 0)
if (num_properties > 0)
{
GVariant *changed_properties;
const gchar *invalidated_properties[1] = {NULL};
@ -1051,7 +1079,9 @@ on_name_owner_changed_get_all_cb (GDBusConnection *connection,
data->proxy->priv->name_owner = data->name_owner;
data->name_owner = NULL; /* to avoid an extra copy, we steal the string */
G_LOCK (properties_lock);
g_hash_table_remove_all (data->proxy->priv->properties);
G_UNLOCK (properties_lock);
if (result != NULL)
{
process_get_all_reply (data->proxy, result);
@ -1109,6 +1139,8 @@ on_name_owner_changed (GDBusConnection *connection,
g_free (proxy->priv->name_owner);
proxy->priv->name_owner = NULL;
G_LOCK (properties_lock);
/* Synthesize ::g-properties-changed changed */
if (!(proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES) &&
g_hash_table_size (proxy->priv->properties) > 0)
@ -1130,6 +1162,8 @@ on_name_owner_changed (GDBusConnection *connection,
/* ... throw out the properties ... */
g_hash_table_remove_all (proxy->priv->properties);
G_UNLOCK (properties_lock);
/* ... and finally emit the ::g-properties-changed signal */
g_signal_emit (proxy, signals[PROPERTIES_CHANGED_SIGNAL],
0,
@ -1137,6 +1171,10 @@ on_name_owner_changed (GDBusConnection *connection,
(const gchar* const *) invalidated_properties->pdata);
g_ptr_array_unref (invalidated_properties);
}
else
{
G_UNLOCK (properties_lock);
}
g_object_notify (G_OBJECT (proxy), "g-name-owner");
}
else
@ -1149,7 +1187,9 @@ on_name_owner_changed (GDBusConnection *connection,
{
g_free (proxy->priv->name_owner);
proxy->priv->name_owner = g_strdup (new_owner);
G_LOCK (properties_lock);
g_hash_table_remove_all (proxy->priv->properties);
G_UNLOCK (properties_lock);
g_object_notify (G_OBJECT (proxy), "g-name-owner");
}
else
@ -2383,8 +2423,8 @@ get_destination_for_call (GDBusProxy *proxy)
*
* This is an asynchronous method. When the operation is finished,
* @callback will be invoked in the
* <link linkend="g-main-context-push-thread-default">thread-default
* main loop</link> of the thread you are calling this method from.
* <link linkend="g-main-context-push-thread-default">thread-default main loop</link>
* of the thread you are calling this method from.
* You can then call g_dbus_proxy_call_finish() to get the result of
* the operation. See g_dbus_proxy_call_sync() for the synchronous
* version of this method.