If weak_ref is not empty, atomically acquire a strong
reference to the object it points to, and return that reference.
This function is needed because of the potential race between taking
the pointer value and g_object_ref() on it, if the object was losing
its last reference at the same time in a different thread.
The caller should release the resulting reference in the usual way,
by using g_object_unref().
Since 2.32
If weak_ref is not empty, atomically acquire a strong reference to the object it points to, and return that reference. This function is needed because of the potential race between taking the pointer value and g_object_ref() on it, if the object was losing its last reference at the same time in a different thread. The caller should release the resulting reference in the usual way, by using g_object_unref(). Since 2.32