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Merge branch 'th/gobj-no-weak-ref-lock' into 'main'

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[th/gobj-no-weak-ref-lock] drop OPTIONAL_BIT_LOCK_WEAK_REFS object lock for `g_object_weak_{ref,unref}()`

See merge request GNOME/glib!4581
This commit is contained in:
Philip Withnall
2025-04-07 12:08:35 +00:00
parent ef3fa35689 93b5b8a051
commit 97fd345cb2
1 changed files with 80 additions and 45 deletions
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125
gobject/gobject.c
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@@ -124,9 +124,8 @@ enum {
* parallel as possible. The alternative would be to add individual locking
* integers to GObjectPrivate. But increasing memory usage for more parallelism
* (per-object!) is not worth it. */
#define OPTIONAL_BIT_LOCK_WEAK_REFS 1
#define OPTIONAL_BIT_LOCK_NOTIFY 2
#define OPTIONAL_BIT_LOCK_TOGGLE_REFS 3
#define OPTIONAL_BIT_LOCK_NOTIFY 1
#define OPTIONAL_BIT_LOCK_TOGGLE_REFS 2
#if SIZEOF_INT == 4 && GLIB_SIZEOF_VOID_P >= 8
#define HAVE_OPTIONAL_FLAGS_IN_GOBJECT 1
@@ -3672,6 +3671,40 @@ weak_refs_notify (gpointer data)
g_free (wstack);
}
static gpointer
g_object_weak_ref_cb (gpointer *data,
GDestroyNotify *destroy_notify,
gpointer user_data)
{
GObject *object = ((gpointer *) user_data)[0];
GWeakNotify notify = ((gpointer *) user_data)[1];
gpointer notify_data = ((gpointer *) user_data)[2];
WeakRefStack *wstack = *data;
guint i;
if (!wstack)
{
wstack = g_new (WeakRefStack, 1);
wstack->object = object;
wstack->n_weak_refs = 1;
i = 0;
*destroy_notify = weak_refs_notify;
}
else
{
i = wstack->n_weak_refs++;
wstack = g_realloc (wstack, sizeof (*wstack) + sizeof (wstack->weak_refs[0]) * i);
}
*data = wstack;
wstack->weak_refs[i].notify = notify;
wstack->weak_refs[i].data = notify_data;
return NULL;
}
/**
* g_object_weak_ref: (skip)
* @object: #GObject to reference weakly
@@ -3694,31 +3727,53 @@ g_object_weak_ref (GObject *object,
GWeakNotify notify,
gpointer data)
{
WeakRefStack *wstack;
guint i;
g_return_if_fail (G_IS_OBJECT (object));
g_return_if_fail (notify != NULL);
g_return_if_fail (g_atomic_int_get (&object->ref_count) >= 1);
object_bit_lock (object, OPTIONAL_BIT_LOCK_WEAK_REFS);
wstack = g_datalist_id_remove_no_notify (&object->qdata, quark_weak_notifies);
_g_datalist_id_update_atomic (&object->qdata,
quark_weak_notifies,
g_object_weak_ref_cb,
((gpointer[]){ object, notify, data }));
}
static gpointer
g_object_weak_unref_cb (gpointer *data,
GDestroyNotify *destroy_notify,
gpointer user_data)
{
GWeakNotify notify = ((gpointer *) user_data)[0];
gpointer notify_data = ((gpointer *) user_data)[1];
WeakRefStack *wstack = *data;
gboolean found_one = FALSE;
guint i;
if (wstack)
{
i = wstack->n_weak_refs++;
wstack = g_realloc (wstack, sizeof (*wstack) + sizeof (wstack->weak_refs[0]) * i);
for (i = 0; i < wstack->n_weak_refs; i++)
{
if (wstack->weak_refs[i].notify != notify ||
wstack->weak_refs[i].data != notify_data)
continue;
wstack->n_weak_refs -= 1;
if (wstack->n_weak_refs == 0)
{
g_free (wstack);
*data = NULL;
}
else if (i != wstack->n_weak_refs)
wstack->weak_refs[i] = wstack->weak_refs[wstack->n_weak_refs];
found_one = TRUE;
break;
}
}
else
{
wstack = g_renew (WeakRefStack, NULL, 1);
wstack->object = object;
wstack->n_weak_refs = 1;
i = 0;
}
wstack->weak_refs[i].notify = notify;
wstack->weak_refs[i].data = data;
g_datalist_id_set_data_full (&object->qdata, quark_weak_notifies, wstack, weak_refs_notify);
object_bit_unlock (object, OPTIONAL_BIT_LOCK_WEAK_REFS);
if (!found_one)
g_critical ("%s: couldn't find weak ref %p(%p)", G_STRFUNC, notify, notify_data);
return NULL;
}
/**
@@ -3734,33 +3789,13 @@ g_object_weak_unref (GObject *object,
GWeakNotify notify,
gpointer data)
{
WeakRefStack *wstack;
gboolean found_one = FALSE;
g_return_if_fail (G_IS_OBJECT (object));
g_return_if_fail (notify != NULL);
object_bit_lock (object, OPTIONAL_BIT_LOCK_WEAK_REFS);
wstack = g_datalist_id_get_data (&object->qdata, quark_weak_notifies);
if (wstack)
{
guint i;
for (i = 0; i < wstack->n_weak_refs; i++)
if (wstack->weak_refs[i].notify == notify &&
wstack->weak_refs[i].data == data)
{
found_one = TRUE;
wstack->n_weak_refs -= 1;
if (i != wstack->n_weak_refs)
wstack->weak_refs[i] = wstack->weak_refs[wstack->n_weak_refs];
break;
}
}
object_bit_unlock (object, OPTIONAL_BIT_LOCK_WEAK_REFS);
if (!found_one)
g_critical ("%s: couldn't find weak ref %p(%p)", G_STRFUNC, notify, data);
_g_datalist_id_update_atomic (&object->qdata,
quark_weak_notifies,
g_object_weak_unref_cb,
((gpointer[]){ notify, data }));
}
/**