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5cab3fcec1
Although returning NULL from constructor is strongly discouraged, some old libraries need to keep doing it for ABI-compatibility reasons. Given this, it's rude to forbid finalization from within constructor(), since it would otherwise work correctly now anyway (and the critical when returning NULL should discourage any new uses of returning NULL from constructor()). https://bugzilla.gnome.org/show_bug.cgi?id=661576
152 lines
3.9 KiB
C
152 lines
3.9 KiB
C
#include <glib-object.h>
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/* --------------------------------- */
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/* test_object_constructor_singleton */
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typedef GObject MySingletonObject;
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typedef GObjectClass MySingletonObjectClass;
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GType my_singleton_object_get_type (void);
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G_DEFINE_TYPE (MySingletonObject, my_singleton_object, G_TYPE_OBJECT)
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static MySingletonObject *singleton;
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static void
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my_singleton_object_init (MySingletonObject *obj)
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{
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}
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static GObject *
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my_singleton_object_constructor (GType type,
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guint n_construct_properties,
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GObjectConstructParam *construct_params)
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{
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GObject *object;
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if (singleton)
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return g_object_ref (singleton);
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object = G_OBJECT_CLASS (my_singleton_object_parent_class)->
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constructor (type, n_construct_properties, construct_params);
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singleton = (MySingletonObject *)object;
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return object;
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}
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static void
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my_singleton_object_finalize (MySingletonObject *obj)
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{
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singleton = NULL;
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G_OBJECT_CLASS (my_singleton_object_parent_class)->finalize (obj);
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}
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static void
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my_singleton_object_class_init (MySingletonObjectClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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object_class->constructor = my_singleton_object_constructor;
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object_class->finalize = my_singleton_object_finalize;
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}
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static void
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test_object_constructor_singleton (void)
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{
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MySingletonObject *one, *two, *three;
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one = g_object_new (my_singleton_object_get_type (), NULL);
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g_assert_cmpint (G_OBJECT (one)->ref_count, ==, 1);
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two = g_object_new (my_singleton_object_get_type (), NULL);
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g_assert (one == two);
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g_assert_cmpint (G_OBJECT (two)->ref_count, ==, 2);
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three = g_object_new (my_singleton_object_get_type (), NULL);
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g_assert (one == three);
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g_assert_cmpint (G_OBJECT (three)->ref_count, ==, 3);
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g_object_add_weak_pointer (G_OBJECT (one), (gpointer *)&one);
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g_object_unref (one);
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g_assert (one != NULL);
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g_object_unref (three);
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g_object_unref (two);
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g_assert (one == NULL);
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}
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/* ----------------------------------- */
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/* test_object_constructor_infanticide */
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typedef GObject MyInfanticideObject;
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typedef GObjectClass MyInfanticideObjectClass;
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GType my_infanticide_object_get_type (void);
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G_DEFINE_TYPE (MyInfanticideObject, my_infanticide_object, G_TYPE_OBJECT)
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static void
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my_infanticide_object_init (MyInfanticideObject *obj)
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{
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}
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static GObject *
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my_infanticide_object_constructor (GType type,
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guint n_construct_properties,
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GObjectConstructParam *construct_params)
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{
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GObject *object;
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object = G_OBJECT_CLASS (my_infanticide_object_parent_class)->
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constructor (type, n_construct_properties, construct_params);
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g_object_unref (object);
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return NULL;
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}
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static void
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my_infanticide_object_class_init (MyInfanticideObjectClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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object_class->constructor = my_infanticide_object_constructor;
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}
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static void
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test_object_constructor_infanticide (void)
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{
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GObject *obj;
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int i;
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g_test_bug ("661576");
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for (i = 0; i < 1000; i++)
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{
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g_test_expect_message ("GLib-GObject", G_LOG_LEVEL_CRITICAL,
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"*finalized while still in-construction*");
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g_test_expect_message ("GLib-GObject", G_LOG_LEVEL_CRITICAL,
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"*Custom constructor*returned NULL*");
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obj = g_object_new (my_infanticide_object_get_type (), NULL);
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g_assert_null (obj);
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g_test_assert_expected_messages ();
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}
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}
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/* --------------------------------- */
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int
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main (int argc, char *argv[])
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{
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g_test_init (&argc, &argv, NULL);
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g_test_bug_base ("http://bugzilla.gnome.org/");
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g_test_add_func ("/object/constructor/singleton", test_object_constructor_singleton);
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g_test_add_func ("/object/constructor/infanticide", test_object_constructor_infanticide);
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return g_test_run ();
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}
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