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gobject: avoid taking reference during g_object_thaw_notify()

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Before dispatching signals (and calling out to user code), we want to
take a reference and ensure that the object stays alive.

However, a thaw may not decrease the freeze_count to zero, or there may
be no properties to notify. Avoid taking a reference in those cases.
This commit is contained in:
Thomas Haller
2023-12-14 11:15:23 +01:00
parent 95c2150d61
commit 9bee14ef3e
1 changed files with 20 additions and 15 deletions
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35
gobject/gobject.c
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@@ -249,7 +249,8 @@ g_object_notify_queue_freeze (GObject *object,
static void
g_object_notify_queue_thaw (GObject *object,
GObjectNotifyQueue *nqueue)
GObjectNotifyQueue *nqueue,
gboolean take_ref)
{
GParamSpec *pspecs_mem[16], **pspecs, **free_me = NULL;
GSList *slist;
@@ -290,7 +291,15 @@ g_object_notify_queue_thaw (GObject *object,
G_UNLOCK(notify_lock);
if (n_pspecs)
G_OBJECT_GET_CLASS (object)->dispatch_properties_changed (object, n_pspecs, pspecs);
{
if (take_ref)
g_object_ref (object);
G_OBJECT_GET_CLASS (object)->dispatch_properties_changed (object, n_pspecs, pspecs);
if (take_ref)
g_object_unref (object);
}
g_free (free_me);
}
@@ -1500,7 +1509,7 @@ g_object_notify_by_spec_internal (GObject *object,
/* we're frozen, so add to the queue and release our freeze */
g_object_notify_queue_add (object, nqueue, pspec);
if (need_thaw)
g_object_notify_queue_thaw (object, nqueue);
g_object_notify_queue_thaw (object, nqueue, FALSE);
}
else
{
@@ -1655,11 +1664,7 @@ g_object_thaw_notify (GObject *object)
}
#endif
g_object_ref (object);
g_object_notify_queue_thaw (object, NULL);
g_object_unref (object);
g_object_notify_queue_thaw (object, NULL, TRUE);
}
static void
@@ -2185,7 +2190,7 @@ g_object_new_with_custom_constructor (GObjectClass *class,
/* If nqueue is non-NULL then we are frozen. Thaw it. */
if (nqueue)
g_object_notify_queue_thaw (object, nqueue);
g_object_notify_queue_thaw (object, nqueue, FALSE);
return object;
}
@@ -2263,7 +2268,7 @@ g_object_new_internal (GObjectClass *class,
object_set_property (object, params[i].pspec, params[i].value, nqueue, TRUE);
if (nqueue)
g_object_notify_queue_thaw (object, nqueue);
g_object_notify_queue_thaw (object, nqueue, FALSE);
return object;
}
@@ -2593,7 +2598,7 @@ g_object_constructor (GType type,
construct_params++;
object_set_property (object, pspec, value, nqueue, TRUE);
}
g_object_notify_queue_thaw (object, nqueue);
g_object_notify_queue_thaw (object, nqueue, FALSE);
/* the notification queue is still frozen from g_object_init(), so
* we don't need to handle it here, g_object_newv() takes
* care of that
@@ -2683,7 +2688,7 @@ g_object_setv (GObject *object,
}
if (nqueue)
g_object_notify_queue_thaw (object, nqueue);
g_object_notify_queue_thaw (object, nqueue, FALSE);
g_object_unref (object);
}
@@ -2749,7 +2754,7 @@ g_object_set_valist (GObject *object,
}
if (nqueue)
g_object_notify_queue_thaw (object, nqueue);
g_object_notify_queue_thaw (object, nqueue, FALSE);
g_object_unref (object);
}
@@ -3869,7 +3874,7 @@ g_object_unref (gpointer _object)
TRACE (GOBJECT_OBJECT_UNREF (object, G_TYPE_FROM_INSTANCE (object), old_ref));
/* emit all notifications that have been queued during dispose() */
g_object_notify_queue_thaw (object, nqueue);
g_object_notify_queue_thaw (object, nqueue, FALSE);
/* if we went from 2->1 we need to notify toggle refs if any */
if (old_ref == 2 && OBJECT_HAS_TOGGLE_REF (object) &&
@@ -3922,7 +3927,7 @@ g_object_unref (gpointer _object)
/* The instance acquired a reference between dispose() and
* finalize(), so we need to thaw the notification queue
*/
g_object_notify_queue_thaw (object, nqueue);
g_object_notify_queue_thaw (object, nqueue, FALSE);
}
}
}