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gobject/tests/reference: add test for deadlock related to GWeakRef and toggle reference

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GWeakRef calls g_object_ref() while holding a read lock.
g_object_ref() can emit a toggle notification.

If you then inside the toggle notification setup a GWeakRef
(to the same or another object), the code will try to get
a write lock. Deadlock will happen.

Add a test to "show" that (the breaking part is commented out).
Will be fixed next.
This commit is contained in:
Thomas Haller 2023-12-23 19:55:27 +01:00
parent dd2b6d7e3f
commit 787861761d
1 changed files with 51 additions and 0 deletions
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51
gobject/tests/reference.c
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@ -719,6 +719,56 @@ test_weak_ref_on_toggle_notify (void)
g_assert_null (g_weak_ref_get (&weak));
}
static void
weak_ref_in_toggle_notify_toggle_cb (gpointer data,
GObject *object,
gboolean is_last_ref)
{
GWeakRef weak2;
GObject *obj2;
if (is_last_ref)
return;
/* We just got a second ref, while calling g_weak_ref_get().
* At this point, we hold a lock for the weak ref.
*
* FIXME: currently we would dead lock with the lines below.
*/
return;
g_weak_ref_init (&weak2, object);
g_assert_true (object == g_weak_ref_get (&weak2));
g_object_unref (object);
obj2 = g_object_new (G_TYPE_OBJECT, NULL);
g_weak_ref_set (&weak2, obj2);
g_object_unref (obj2);
g_assert_null (g_weak_ref_get (&weak2));
}
static void
test_weak_ref_in_toggle_notify (void)
{
GObject *obj;
GWeakRef weak = { { GUINT_TO_POINTER (0xDEADBEEFU) } };
obj = g_object_new (G_TYPE_OBJECT, NULL);
g_object_add_toggle_ref (obj, weak_ref_in_toggle_notify_toggle_cb, NULL);
g_object_unref (obj);
g_weak_ref_init (&weak, obj);
/* We trigger a toggle notify via g_weak_ref_get(). */
g_assert_true (g_weak_ref_get (&weak) == obj);
g_object_remove_toggle_ref (obj, weak_ref_in_toggle_notify_toggle_cb, NULL);
g_object_unref (obj);
g_assert_null (g_weak_ref_get (&weak));
}
typedef struct
{
gboolean should_be_last;
@ -1365,6 +1415,7 @@ main (int argc, char **argv)
g_test_add_func ("/object/weak-ref/on-dispose", test_weak_ref_on_dispose);
g_test_add_func ("/object/weak-ref/on-run-dispose", test_weak_ref_on_run_dispose);
g_test_add_func ("/object/weak-ref/on-toggle-notify", test_weak_ref_on_toggle_notify);
g_test_add_func ("/object/weak-ref/in-toggle-notify", test_weak_ref_in_toggle_notify);
g_test_add_func ("/object/toggle-ref", test_toggle_ref);
g_test_add_func ("/object/toggle-ref/ref-on-dispose", test_toggle_ref_on_dispose);
g_test_add_func ("/object/toggle-ref/ref-and-notify-on-dispose", test_toggle_ref_and_notify_on_dispose);