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bin: fix refcount when removing elements during state change

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When an element is removed from a bin because it caused a state change error,
don't unref the child twice.
Add some more debug info.
Add a unit test for this error.

Fixes #615756
This commit is contained in:
Wim Taymans 2010-04-14 17:56:17 +02:00
parent 88b4a704f3
commit 67ab660b19
2 changed files with 63 additions and 3 deletions
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11
gst/gstbin.c
View file

@ -2446,17 +2446,22 @@ restart:
/* Only fail if the child is still inside
* this bin. It might've been removed already
* because of the error by the bin subclass
* to ignore the error.
*/
* to ignore the error. */
parent = gst_object_get_parent (GST_OBJECT_CAST (child));
if (parent == GST_OBJECT_CAST (element)) {
/* element is still in bin, really error now */
gst_object_unref (child);
gst_object_unref (parent);
goto done;
}
/* child removed from bin, let the resync code redo the state
* change */
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
"child '%s' was removed from the bin",
GST_ELEMENT_NAME (child));
if (parent)
gst_object_unref (parent);
gst_object_unref (child);
break;
}

55
tests/check/gst/gstbin.c
View file

@ -971,6 +971,60 @@ GST_START_TEST (test_link_structure_change)
GST_END_TEST;
static GstBusSyncReply
sync_handler_remove_sink (GstBus * bus, GstMessage * message, gpointer data)
{
if (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ERROR) {
GstElement *child;
child = gst_bin_get_by_name (GST_BIN (data), "fakesink");
fail_unless (child != NULL, "Could not find fakesink");
gst_bin_remove (GST_BIN (data), child);
gst_object_unref (child);
}
return GST_BUS_PASS;
}
GST_START_TEST (test_state_failure_remove)
{
GstElement *src, *sink, *pipeline;
GstBus *bus;
GstStateChangeReturn ret;
pipeline = gst_pipeline_new (NULL);
fail_unless (pipeline != NULL, "Could not create pipeline");
src = gst_element_factory_make ("fakesrc", "fakesrc");
fail_unless (src != NULL, "Could not create fakesrc");
sink = gst_element_factory_make ("fakesink", "fakesink");
fail_unless (sink != NULL, "Could not create fakesink");
g_object_set (sink, "state-error", 1, NULL);
gst_bin_add (GST_BIN (pipeline), src);
gst_bin_add (GST_BIN (pipeline), sink);
gst_element_link (src, sink);
bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
fail_unless (bus != NULL, "Could not get bus");
gst_bus_set_sync_handler (bus, sync_handler_remove_sink, pipeline);
ret = gst_element_set_state (pipeline, GST_STATE_READY);
fail_unless (ret == GST_STATE_CHANGE_SUCCESS,
"did not get state change success");
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (bus);
gst_object_unref (pipeline);
}
GST_END_TEST;
static Suite *
gst_bin_suite (void)
{
@ -992,6 +1046,7 @@ gst_bin_suite (void)
tcase_add_test (tc_chain, test_add_self);
tcase_add_test (tc_chain, test_iterate_sorted);
tcase_add_test (tc_chain, test_link_structure_change);
tcase_add_test (tc_chain, test_state_failure_remove);
return s;
}