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gobject: Read the toggle reference state only after we've update the references

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We were reading if an object has toggle references even if this was not
really relevant for the current object state, as we only need to notify
when going from 2 to 1 references, so first ensure that this is the case
and then check if we have toggle references enabled in the object.

This is a micro-optimization, for the way flags are defined, but still
an operation we can avoid in most cases.
This commit is contained in:
Marco Trevisan (Treviño) 2022-11-29 21:36:48 +01:00
parent 65303537b0
commit c0360f626c
1 changed files with 5 additions and 3 deletions
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6
gobject/gobject.c
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@ -3794,7 +3794,6 @@ g_object_unref (gpointer _object)
while (old_ref > 1)
{
/* valid if last 2 refs are owned by this call to unref and the toggle_ref */
gboolean has_toggle_ref = OBJECT_HAS_TOGGLE_REF (object);
if (!g_atomic_int_compare_and_exchange_full ((int *)&object->ref_count,
old_ref, old_ref - 1,
@ -3804,8 +3803,11 @@ g_object_unref (gpointer _object)
TRACE (GOBJECT_OBJECT_UNREF(object,G_TYPE_FROM_INSTANCE(object),old_ref));
/* if we went from 2->1 we need to notify toggle refs if any */
if (old_ref == 2 && has_toggle_ref) /* The last ref being held in this case is owned by the toggle_ref */
if (old_ref == 2 && OBJECT_HAS_TOGGLE_REF (object))
{
/* The last ref being held in this case is owned by the toggle_ref */
toggle_refs_notify (object, TRUE);
}
return;
}