Make GMainLoop, GMainContext and GSource boxed types

Also add some annotations for better usage of these types in bindings.

https://bugzilla.gnome.org/show_bug.cgi?id=657725

glib/gmain.c

@@ -641,7 +641,7 @@ g_main_context_new (void)
  * specified, and corresponds to the "main" main loop. See also
  * g_main_context_get_thread_default().
  * 
- * Return value: the global default main context.
+ * Return value: (transfer none): the global default main context.
  **/
 GMainContext *
 g_main_context_default (void)
@@ -782,8 +782,8 @@ g_main_context_pop_thread_default (GMainContext *context)
  * non-default context, so it is not safe to assume that this will
  * always return %NULL if threads are not initialized.)
  *
- * Returns: the thread-default #GMainContext, or %NULL if the
+ * Returns: (transfer none): the thread-default #GMainContext, or
- * thread-default context is the global default context.
+ * %NULL if the thread-default context is the global default context.
  *
  * Since: 2.22
  **/
@@ -1085,9 +1085,9 @@ g_source_get_id (GSource *source)
  * Gets the #GMainContext with which the source is associated.
  * Calling this function on a destroyed source is an error.
  * 
- * Return value: the #GMainContext with which the source is associated,
+ * Return value: (transfer none): the #GMainContext with which the
- *               or %NULL if the context has not yet been added
+ *               source is associated, or %NULL if the context has not
- *               to a source.
+ *               yet been added to a source.
  **/
 GMainContext *
 g_source_get_context (GSource *source)
@@ -1740,7 +1740,7 @@ g_source_unref (GSource *source)
  * 
  * Finds a #GSource given a pair of context and ID.
  * 
- * Return value: the #GSource if found, otherwise, %NULL
+ * Return value: (transfer none): the #GSource if found, otherwise, %NULL
  **/
 GSource *
 g_main_context_find_source_by_id (GMainContext *context,
@@ -1779,7 +1779,7 @@ g_main_context_find_source_by_id (GMainContext *context,
  * multiple sources exist with the same source function and user data,
  * the first one found will be returned.
  * 
- * Return value: the source, if one was found, otherwise %NULL
+ * Return value: (transfer none): the source, if one was found, otherwise %NULL
  **/
 GSource *
 g_main_context_find_source_by_funcs_user_data (GMainContext *context,
@@ -1827,7 +1827,7 @@ g_main_context_find_source_by_funcs_user_data (GMainContext *context,
  * multiple sources exist with the same user data, the first
  * one found will be returned.
  * 
- * Return value: the source, if one was found, otherwise %NULL
+ * Return value: (transfer none): the source, if one was found, otherwise %NULL
  **/
 GSource *
 g_main_context_find_source_by_user_data (GMainContext *context,
@@ -2254,7 +2254,7 @@ g_main_depth (void)
  *
  * Returns the currently firing source for this thread.
  * 
- * Return value: The currently firing source or %NULL.
+ * Return value: (transfer none): The currently firing source or %NULL.
  *
  * Since: 2.12
  */
@@ -2807,8 +2807,9 @@ g_main_context_prepare (GMainContext *context,
  * g_main_context_query:
  * @context: a #GMainContext
  * @max_priority: maximum priority source to check
- * @timeout_: location to store timeout to be used in polling
+ * @timeout_: (out): location to store timeout to be used in polling
- * @fds: location to store #GPollFD records that need to be polled.
+ * @fds: (out caller-allocates) (array length=n_fds): location to
+ *       store #GPollFD records that need to be polled.
  * @n_fds: length of @fds.
  * 
  * Determines information necessary to poll this main loop.
@@ -2877,8 +2878,8 @@ g_main_context_query (GMainContext *context,
  * g_main_context_check:
  * @context: a #GMainContext
  * @max_priority: the maximum numerical priority of sources to check
- * @fds: array of #GPollFD's that was passed to the last call to
+ * @fds: (array length=n_fds): array of #GPollFD's that was passed to
- *       g_main_context_query()
+ *       the last call to g_main_context_query()
  * @n_fds: return value of g_main_context_query()
  * 
  * Passes the results of polling back to the main loop.
@@ -3355,7 +3356,7 @@ g_main_loop_is_running (GMainLoop *loop)
  * 
  * Returns the #GMainContext of @loop.
  * 
- * Return value: the #GMainContext of @loop
+ * Return value: (transfer none): the #GMainContext of @loop
  **/
 GMainContext *
 g_main_loop_get_context (GMainLoop *loop)
@@ -4906,7 +4907,7 @@ g_idle_remove_by_data (gpointer data)
 
 /**
  * g_main_context_invoke:
- * @context: a #GMainContext, or %NULL
+ * @context: (allow-none): a #GMainContext, or %NULL
  * @function: function to call
  * @data: data to pass to @function
  *
@@ -4946,7 +4947,7 @@ g_main_context_invoke (GMainContext *context,
 
 /**
  * g_main_context_invoke_full:
- * @context: a #GMainContext, or %NULL
+ * @context: (allow-none): a #GMainContext, or %NULL
  * @priority: the priority at which to run @function
  * @function: function to call
  * @data: data to pass to @function

glib/gmain.h

@@ -125,7 +125,7 @@ typedef struct _GSourceFuncs            GSourceFuncs;
 
 /**
  * GSourceFunc:
- * @data: data passed to the function, set when the source was
+ * @user_data: data passed to the function, set when the source was
  *     created with one of the above functions
  *
  * Specifies the type of function passed to g_timeout_add(),
@@ -133,20 +133,20 @@ typedef struct _GSourceFuncs            GSourceFuncs;
  *
  * Returns: %FALSE if the source should be removed
  */
-typedef gboolean (*GSourceFunc)       (gpointer data);
+typedef gboolean (*GSourceFunc)       (gpointer user_data);
 
 /**
  * GChildWatchFunc:
  * @pid: the process id of the child process
  * @status: Status information about the child process,
  *     see waitpid(2) for more information about this field
- * @data: user data passed to g_child_watch_add()
+ * @user_data: user data passed to g_child_watch_add()
  *
  * The type of functions to be called when a child exists.
  */
 typedef void     (*GChildWatchFunc)   (GPid     pid,
                                        gint     status,
-                                       gpointer data);
+                                       gpointer user_data);
 struct _GSource
 {
   /*< private >*/

gobject/gboxed.c

@@ -145,6 +145,9 @@ G_DEFINE_BOXED_TYPE (GVariantBuilder, g_variant_builder, g_variant_builder_ref,
 G_DEFINE_BOXED_TYPE (GError, g_error, g_error_copy, g_error_free)
 
 G_DEFINE_BOXED_TYPE (GDateTime, g_date_time, g_date_time_ref, g_date_time_unref);
+G_DEFINE_BOXED_TYPE (GMainLoop, g_main_loop, g_main_loop_ref, g_main_loop_unref)
+G_DEFINE_BOXED_TYPE (GMainContext, g_main_context, g_main_context_ref, g_main_context_unref)
+G_DEFINE_BOXED_TYPE (GSource, g_source, g_source_ref, g_source_unref)
 
 /* This one can't use G_DEFINE_BOXED_TYPE (GStrv, g_strv, g_strdupv, g_strfreev) */
 GType

gobject/glib-types.h

@@ -182,6 +182,33 @@ typedef gsize GType;
  */
 #define G_TYPE_VARIANT_BUILDER (g_variant_builder_get_type ())
 
+/**
+ * G_TYPE_MAIN_LOOP:
+ *
+ * The #GType for a boxed type holding a #GMainLoop.
+ *
+ * Since: 2.30
+ */
+#define G_TYPE_MAIN_LOOP (g_main_loop_get_type ())
+
+/**
+ * G_TYPE_MAIN_CONTEXT:
+ *
+ * The #GType for a boxed type holding a #GMainContext.
+ *
+ * Since: 2.30
+ */
+#define G_TYPE_MAIN_CONTEXT (g_main_context_get_type ())
+
+/**
+ * G_TYPE_SOURCE:
+ *
+ * The #GType for a boxed type holding a #GSource.
+ *
+ * Since: 2.30
+ */
+#define G_TYPE_SOURCE (g_source_get_type ())
+
 GType   g_date_get_type            (void) G_GNUC_CONST;
 GType   g_strv_get_type            (void) G_GNUC_CONST;
 GType   g_gstring_get_type         (void) G_GNUC_CONST;
@@ -197,6 +224,9 @@ GType   g_date_time_get_type       (void) G_GNUC_CONST;
 GType   g_io_channel_get_type      (void) G_GNUC_CONST;
 GType   g_io_condition_get_type    (void) G_GNUC_CONST;
 GType   g_variant_builder_get_type (void) G_GNUC_CONST;
+GType   g_main_loop_get_type       (void) G_GNUC_CONST;
+GType   g_main_context_get_type    (void) G_GNUC_CONST;
+GType   g_source_get_type          (void) G_GNUC_CONST;
 
 #if !defined(G_DISABLE_DEPRECATED) || defined(__GI_SCANNER__)
 GType   g_variant_get_gtype        (void) G_GNUC_CONST;

gobject/gobject.symbols

@@ -27,6 +27,9 @@ g_regex_get_type
 g_match_info_get_type
 g_variant_builder_get_type
 g_variant_type_get_gtype
+g_main_loop_get_type
+g_main_context_get_type
+g_source_get_type
 g_closure_get_type
 g_value_get_type
 g_value_array_get_type