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controlbinding: Store object in a thread-safe GWeakRef

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g_object_weak_ref() is not thread-safe.
This commit is contained in:
Sebastian Dröge 2016-10-13 18:20:58 +02:00
parent 6df88752ee
commit 35a34d2fa8
2 changed files with 50 additions and 16 deletions
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52
gst/gstcontrolbinding.c
View file

@ -71,6 +71,11 @@ static void gst_control_binding_finalize (GObject * object);
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GstControlBinding, gst_control_binding,
GST_TYPE_OBJECT, _do_init);
struct _GstControlBindingPrivate
{
GWeakRef object;
};
enum
{
PROP_0,
@ -86,6 +91,8 @@ gst_control_binding_class_init (GstControlBindingClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
g_type_class_add_private (klass, sizeof (GstControlBindingPrivate));
gobject_class->constructor = gst_control_binding_constructor;
gobject_class->set_property = gst_control_binding_set_property;
gobject_class->get_property = gst_control_binding_get_property;
@ -108,6 +115,10 @@ gst_control_binding_class_init (GstControlBindingClass * klass)
static void
gst_control_binding_init (GstControlBinding * binding)
{
binding->ABI.abi.priv =
G_TYPE_INSTANCE_GET_PRIVATE (binding, GST_TYPE_CONTROL_BINDING,
GstControlBindingPrivate);
g_weak_ref_init (&binding->ABI.abi.priv->object, NULL);
}
static GObject *
@ -116,19 +127,26 @@ gst_control_binding_constructor (GType type, guint n_construct_params,
{
GstControlBinding *binding;
GParamSpec *pspec;
GstObject *object;
binding =
GST_CONTROL_BINDING (G_OBJECT_CLASS (gst_control_binding_parent_class)
->constructor (type, n_construct_params, construct_params));
GST_INFO_OBJECT (binding->object, "trying to put property '%s' under control",
object = g_weak_ref_get (&binding->ABI.abi.priv->object);
if (!object) {
GST_WARNING_OBJECT (object, "no object set");
return (GObject *) binding;
}
GST_INFO_OBJECT (object, "trying to put property '%s' under control",
binding->name);
/* check if the object has a property of that name */
if ((pspec =
g_object_class_find_property (G_OBJECT_GET_CLASS (binding->object),
g_object_class_find_property (G_OBJECT_GET_CLASS (object),
binding->name))) {
GST_DEBUG_OBJECT (binding->object, " psec->flags : 0x%08x", pspec->flags);
GST_DEBUG_OBJECT (object, " psec->flags : 0x%08x", pspec->flags);
/* check if this param is witable && controlable && !construct-only */
if ((pspec->flags & (G_PARAM_WRITABLE | GST_PARAM_CONTROLLABLE |
@ -136,15 +154,18 @@ gst_control_binding_constructor (GType type, guint n_construct_params,
(G_PARAM_WRITABLE | GST_PARAM_CONTROLLABLE)) {
binding->pspec = pspec;
} else {
GST_WARNING_OBJECT (binding->object,
GST_WARNING_OBJECT (object,
"property '%s' on class '%s' needs to "
"be writeable, controlable and not construct_only", binding->name,
G_OBJECT_TYPE_NAME (binding->object));
G_OBJECT_TYPE_NAME (object));
}
} else {
GST_WARNING_OBJECT (binding->object, "class '%s' has no property '%s'",
G_OBJECT_TYPE_NAME (binding->object), binding->name);
GST_WARNING_OBJECT (object, "class '%s' has no property '%s'",
G_OBJECT_TYPE_NAME (object), binding->name);
}
gst_object_unref (object);
return (GObject *) binding;
}
@ -154,9 +175,10 @@ gst_control_binding_dispose (GObject * object)
GstControlBinding *self = GST_CONTROL_BINDING (object);
/* we did not took a reference */
g_object_remove_weak_pointer ((GObject *) self->object,
(gpointer *) & self->object);
self->object = NULL;
g_object_remove_weak_pointer ((GObject *) self->__object,
(gpointer *) & self->__object);
self->__object = NULL;
g_weak_ref_clear (&self->ABI.abi.priv->object);
((GObjectClass *) gst_control_binding_parent_class)->dispose (object);
}
@ -180,9 +202,11 @@ gst_control_binding_set_property (GObject * object, guint prop_id,
switch (prop_id) {
case PROP_OBJECT:
/* do not ref to avoid a ref cycle */
self->object = g_value_get_object (value);
g_object_add_weak_pointer ((GObject *) self->object,
(gpointer *) & self->object);
self->__object = g_value_get_object (value);
g_object_add_weak_pointer ((GObject *) self->__object,
(gpointer *) & self->__object);
g_weak_ref_set (&self->ABI.abi.priv->object, self->__object);
break;
case PROP_NAME:
self->name = g_value_dup_string (value);
@ -201,7 +225,7 @@ gst_control_binding_get_property (GObject * object, guint prop_id,
switch (prop_id) {
case PROP_OBJECT:
g_value_set_object (value, self->object);
g_value_take_object (value, g_weak_ref_get (&self->ABI.abi.priv->object));
break;
case PROP_NAME:
g_value_set_string (value, self->name);

10
gst/gstcontrolbinding.h
View file

@ -46,6 +46,7 @@ G_BEGIN_DECLS
typedef struct _GstControlBinding GstControlBinding;
typedef struct _GstControlBindingClass GstControlBindingClass;
typedef struct _GstControlBindingPrivate GstControlBindingPrivate;
/* FIXME(2.0): remove, this is unused */
typedef void (* GstControlBindingConvert) (GstControlBinding *binding, gdouble src_value, GValue *dest_value);
@ -65,11 +66,20 @@ struct _GstControlBinding {
GParamSpec *pspec;
/*< private >*/
#ifndef GST_DISABLE_DEPRECATED
GstObject *object; /* GstObject owning the property
* (== parent when bound) */
#else
gpointer __object;
#endif
gboolean disabled;
union {
struct {
GstControlBindingPrivate *priv;
} abi;
gpointer _gst_reserved[GST_PADDING];
} ABI;
};
/**