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Handle a corner-case of notify avoidance

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The corner-case we are handling here is that
we don't freeze the notify queue in g_object_init
(because there's no custom ->notify vfunc, but
then we gain a notify handler during instance
init, and instance init also triggers a
notification. Handle this by jit freezing
notification in g_object_notify_by_spec_internal.

Note that this is bad code - instance init really
shouldn't be doing things like this.

Testcase included.

Fixes: #2665
This commit is contained in:
Matthias Clasen 2022-06-08 14:06:40 -04:00
parent 9444ace2c8
commit 58ab960a87
1 changed files with 33 additions and 5 deletions
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38
gobject/gobject.c
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@ -1441,24 +1441,51 @@ static inline void
g_object_notify_by_spec_internal (GObject *object,
GParamSpec *pspec)
{
#ifdef HAVE_OPTIONAL_FLAGS
guint object_flags;
#endif
gboolean has_notify;
gboolean in_init;
if (G_UNLIKELY (~pspec->flags & G_PARAM_READABLE))
return;
param_spec_follow_override (&pspec);
if (pspec != NULL &&
_g_object_has_notify_handler (object))
#ifdef HAVE_OPTIONAL_FLAGS
/* get all flags we need with a single atomic read */
object_flags = object_get_optional_flags (object);
has_notify = ((object_flags & OPTIONAL_FLAG_HAS_NOTIFY_HANDLER) != 0) ||
CLASS_HAS_NOTIFY (G_OBJECT_GET_CLASS (object));
in_init = (object_flags & OPTIONAL_FLAG_IN_CONSTRUCTION) != 0;
#else
has_notify = TRUE;
in_init = object_in_construction (object);
#endif
if (pspec != NULL && has_notify)
{
GObjectNotifyQueue *nqueue;
gboolean need_thaw = TRUE;
/* conditional freeze: only increase freeze count if already frozen */
nqueue = g_object_notify_queue_freeze (object, TRUE);
if (in_init && !nqueue)
{
/* We did not freeze the queue in g_object_init, but
* we gained a notify handler in instance init, so
* now we need to freeze just-in-time
*/
nqueue = g_object_notify_queue_freeze (object, FALSE);
need_thaw = FALSE;
}
if (nqueue != NULL)
{
/* we're frozen, so add to the queue and release our freeze */
g_object_notify_queue_add (object, nqueue, pspec);
g_object_notify_queue_thaw (object, nqueue);
if (need_thaw)
g_object_notify_queue_thaw (object, nqueue);
}
else
{
@ -2167,11 +2194,12 @@ g_object_new_internal (GObjectClass *class,
{
GSList *node;
if (CLASS_HAS_NOTIFY (class))
if (_g_object_has_notify_handler (object))
{
/* This will have been setup in g_object_init() */
nqueue = g_datalist_id_get_data (&object->qdata, quark_notify_queue);
g_assert (nqueue != NULL);
if (!nqueue)
nqueue = g_object_notify_queue_freeze (object, FALSE);
}
/* We will set exactly n_construct_properties construct