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uridownloader: Use a GWeakRef to the parent to prevent a reference cycle

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=780140
This commit is contained in:
Sebastian Dröge 2017-03-17 12:58:06 +02:00
parent 45a6449e64
commit 58370ed6cf
1 changed files with 13 additions and 15 deletions
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28
gst-libs/gst/uridownloader/gsturidownloader.c
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@ -42,7 +42,7 @@ struct _GstUriDownloaderPrivate
gboolean got_buffer;
GMutex download_lock; /* used to restrict to one download only */
GstElement *parent;
GWeakRef parent;
GError *err;
@ -135,10 +135,7 @@ gst_uri_downloader_dispose (GObject * object)
downloader->priv->download = NULL;
}
if (downloader->priv->parent) {
gst_object_unref (downloader->priv->parent);
downloader->priv->parent = NULL;
}
g_weak_ref_clear (&downloader->priv->parent);
G_OBJECT_CLASS (gst_uri_downloader_parent_class)->dispose (object);
}
@ -173,8 +170,7 @@ void
gst_uri_downloader_set_parent (GstUriDownloader * downloader,
GstElement * parent)
{
gst_object_replace ((GstObject **) & downloader->priv->parent,
GST_OBJECT_CAST (parent));
g_weak_ref_set (&downloader->priv->parent, parent);
}
static gboolean
@ -280,25 +276,25 @@ gst_uri_downloader_bus_handler (GstBus * bus,
g_error_free (err);
g_free (dbg_info);
} else if (GST_MESSAGE_TYPE (message) == GST_MESSAGE_NEED_CONTEXT) {
GstElement *parent = g_weak_ref_get (&downloader->priv->parent);
/* post the same need-context as if it was from the parent and then
* get it to our internal element that requested it */
if (downloader->priv->parent && GST_IS_ELEMENT (GST_MESSAGE_SRC (message))) {
if (parent && GST_IS_ELEMENT (GST_MESSAGE_SRC (message))) {
const gchar *context_type;
GstContext *context;
GstElement *msg_src = GST_ELEMENT_CAST (GST_MESSAGE_SRC (message));
gst_message_parse_context_type (message, &context_type);
context =
gst_element_get_context (downloader->priv->parent, context_type);
context = gst_element_get_context (parent, context_type);
/* No context, request one */
if (!context) {
GstMessage *need_context_msg =
gst_message_new_need_context (GST_OBJECT_CAST (downloader->
priv->parent), context_type);
gst_element_post_message (downloader->priv->parent, need_context_msg);
context =
gst_element_get_context (downloader->priv->parent, context_type);
gst_message_new_need_context (GST_OBJECT_CAST (parent),
context_type);
gst_element_post_message (parent, need_context_msg);
context = gst_element_get_context (parent, context_type);
}
if (context) {
@ -306,6 +302,8 @@ gst_uri_downloader_bus_handler (GstBus * bus,
gst_context_unref (context);
}
}
if (parent)
gst_object_unref (parent);
}
gst_message_unref (message);