tests/check/gst/gstiterator.c - imx-gstreamer - Git at Google

 /* GStreamer
  * Copyright (C) 2005 Andy Wingo <wingo@pobox.com>
  *
  * gstiterator.c: Unit test for iterators
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public
  * License along with this library; if not, write to the
  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */


 #include <gst/check/gstcheck.h>


 static GList *
 make_list_of_ints (gint n)
 {
   GList *ret = NULL;
   gint i;

   for (i = 0; i < n; i++)
     ret = g_list_prepend (ret, GINT_TO_POINTER (i));

   return g_list_reverse (ret);
 }

 #define NUM_ELEMENTS 10

 GST_START_TEST (test_manual_iteration)
 {
   GList *l;
   guint32 cookie = 0;
   GMutex m;
   GstIterator *iter;
   GstIteratorResult res;
   GValue item = { 0, };
   gint i = 0;

   l = make_list_of_ints (NUM_ELEMENTS);
   g_mutex_init (&m);

   iter = gst_iterator_new_list (G_TYPE_POINTER, &m, &cookie, &l, NULL, NULL);

   fail_unless (iter != NULL);

   while (1) {
     res = gst_iterator_next (iter, &item);
     if (i < NUM_ELEMENTS) {
       fail_unless (res == GST_ITERATOR_OK);
       fail_unless (GPOINTER_TO_INT (g_value_get_pointer (&item)) == i);
       g_value_reset (&item);
       i++;
       continue;
     } else {
       fail_unless (res == GST_ITERATOR_DONE);
       break;
     }
   }
   /* clean up */
   g_value_unset (&item);
   gst_iterator_free (iter);
   g_mutex_clear (&m);
   g_list_free (l);
 }

 GST_END_TEST;

 GST_START_TEST (test_resync)
 {
   GList *l;
   guint32 cookie = 0;
   GMutex m;
   GstIterator *iter;
   GstIteratorResult res;
   GValue item = { 0, };
   gint i = 0;
   gboolean hacked_list = FALSE;

   l = make_list_of_ints (NUM_ELEMENTS);
   g_mutex_init (&m);

   iter = gst_iterator_new_list (G_TYPE_POINTER, &m, &cookie, &l, NULL, NULL);

   fail_unless (iter != NULL);

   while (1) {
     res = gst_iterator_next (iter, &item);
     if (i < NUM_ELEMENTS / 2) {
       fail_unless (res == GST_ITERATOR_OK);
       fail_unless (GPOINTER_TO_INT (g_value_get_pointer (&item)) == i);
       g_value_reset (&item);
       i++;
       continue;
     } else if (!hacked_list) {
       /* here's where we test resync */
       fail_unless (res == GST_ITERATOR_OK);
       g_value_reset (&item);
       l = g_list_prepend (l, GINT_TO_POINTER (-1));
       cookie++;
       hacked_list = TRUE;
       continue;
     } else {
       fail_unless (res == GST_ITERATOR_RESYNC);
       gst_iterator_resync (iter);
       res = gst_iterator_next (iter, &item);
       fail_unless (res == GST_ITERATOR_OK);
       fail_unless (GPOINTER_TO_INT (g_value_get_pointer (&item)) == -1);
       g_value_reset (&item);
       break;
     }
   }

   /* clean up */
   g_value_unset (&item);
   gst_iterator_free (iter);
   g_mutex_clear (&m);
   g_list_free (l);
 }

 GST_END_TEST;

 static gboolean
 add_fold_func (const GValue * item, GValue * ret, gpointer user_data)
 {
   g_value_set_int (ret,
       g_value_get_int (ret) + GPOINTER_TO_INT (g_value_get_pointer (item)));
   return TRUE;
 }

 GST_START_TEST (test_fold)
 {
   GList *l;
   guint32 cookie = 0;
   GMutex m;
   GstIterator *iter;
   GstIteratorResult res;
   gint i, expected;
   GValue ret = { 0, };

   l = make_list_of_ints (NUM_ELEMENTS);
   g_mutex_init (&m);
   iter = gst_iterator_new_list (G_TYPE_POINTER, &m, &cookie, &l, NULL, NULL);
   fail_unless (iter != NULL);

   expected = 0;
   for (i = 0; i < NUM_ELEMENTS; i++)
     expected += i;

   g_value_init (&ret, G_TYPE_INT);
   g_value_set_int (&ret, 0);

   res = gst_iterator_fold (iter, add_fold_func, &ret, NULL);

   fail_unless (res == GST_ITERATOR_DONE);
   fail_unless (g_value_get_int (&ret) == expected);

   /* clean up */
   gst_iterator_free (iter);
   g_mutex_clear (&m);
   g_list_free (l);
 }

 GST_END_TEST;

 GST_START_TEST (test_single)
 {
   GstIterator *it;
   GstStructure *s = gst_structure_new_empty ("test");
   GValue v = { 0, };
   GstStructure *i;

   g_value_init (&v, GST_TYPE_STRUCTURE);
   g_value_set_boxed (&v, s);
   it = gst_iterator_new_single (GST_TYPE_STRUCTURE, &v);
   g_value_reset (&v);

   fail_unless (gst_iterator_next (it, &v) == GST_ITERATOR_OK);
   i = g_value_get_boxed (&v);
   fail_unless (strcmp (gst_structure_get_name (s),
           gst_structure_get_name (i)) == 0);
   i = NULL;
   g_value_reset (&v);

   fail_unless (gst_iterator_next (it, &v) == GST_ITERATOR_DONE);
   fail_unless (g_value_get_boxed (&v) == NULL);

   gst_iterator_free (it);
   gst_structure_free (s);

   it = gst_iterator_new_single (GST_TYPE_STRUCTURE, NULL);

   fail_unless (gst_iterator_next (it, &v) == GST_ITERATOR_DONE);
   fail_unless (g_value_get_boxed (&v) == NULL);

   g_value_reset (&v);

   gst_iterator_free (it);
 }

 GST_END_TEST;

 static gint
 filter2_cb (gconstpointer a, gconstpointer b)
 {
   const GValue *va = a;
   gint ia;

   ia = GPOINTER_TO_INT (g_value_get_pointer (va));

   return ia % 2;
 }

 GST_START_TEST (test_filter)
 {
   GList *l;
   guint32 cookie = 0;
   GMutex m;
   GstIterator *iter, *filter;
   GstIteratorResult res;
   GValue item = { 0, };
   gint expected = 0, value;

   l = make_list_of_ints (NUM_ELEMENTS);
   g_mutex_init (&m);
   iter = gst_iterator_new_list (G_TYPE_POINTER, &m, &cookie, &l, NULL, NULL);
   fail_unless (iter != NULL);

   filter = gst_iterator_filter (iter, filter2_cb, NULL);

   while (1) {
     res = gst_iterator_next (filter, &item);
     if (res == GST_ITERATOR_DONE)
       break;
     fail_unless (res == GST_ITERATOR_OK);
     value = GPOINTER_TO_INT (g_value_get_pointer (&item));
     fail_unless_equals_int (value, expected);
     expected += 2;
   }

   /* clean up */
   g_value_unset (&item);
   gst_iterator_free (filter);
   g_mutex_clear (&m);
   g_list_free (l);
 }

 GST_END_TEST;

 static gint
 filter2_lock_cb (gconstpointer a, gconstpointer b)
 {
   const GValue *va = a;
   const GValue *vb = b;
   gint ia;
   GMutex *m;

   ia = GPOINTER_TO_INT (g_value_get_pointer (va));

   m = g_value_get_pointer (vb);
   g_mutex_lock (m);
   g_mutex_unlock (m);

   return ia % 2;
 }

 GST_START_TEST (test_filter_locking)
 {
   GList *l;
   guint32 cookie = 0;
   GMutex m;
   GstIterator *iter, *filter;
   GstIteratorResult res;
   GValue item = { 0, };
   GValue user_data = { 0, };
   gint expected = 0, value;

   l = make_list_of_ints (NUM_ELEMENTS);
   g_mutex_init (&m);
   iter = gst_iterator_new_list (G_TYPE_POINTER, &m, &cookie, &l, NULL, NULL);
   fail_unless (iter != NULL);

   g_value_init (&user_data, G_TYPE_POINTER);
   g_value_set_pointer (&user_data, &m);

   filter = gst_iterator_filter (iter, filter2_lock_cb, &user_data);

   while (1) {
     res = gst_iterator_next (filter, &item);
     if (res == GST_ITERATOR_DONE)
       break;
     fail_unless (res == GST_ITERATOR_OK);
     value = GPOINTER_TO_INT (g_value_get_pointer (&item));
     fail_unless_equals_int (value, expected);
     expected += 2;
   }

   /* clean up */
   g_value_unset (&item);
   g_value_unset (&user_data);
   gst_iterator_free (filter);
   g_mutex_clear (&m);
   g_list_free (l);
 }

 GST_END_TEST;

 static gint
 filter4_cb (gconstpointer a, gconstpointer b)
 {
   const GValue *va = a;
   gint ia;

   ia = GPOINTER_TO_INT (g_value_get_pointer (va));

   return ia % 4;
 }

 GST_START_TEST (test_filter_of_filter)
 {
   GList *l;
   guint32 cookie = 0;
   GMutex m;
   GstIterator *iter, *filter, *filter2;
   GstIteratorResult res;
   GValue item = { 0, };
   gint expected = 0, value;

   l = make_list_of_ints (NUM_ELEMENTS);
   g_mutex_init (&m);
   iter = gst_iterator_new_list (G_TYPE_POINTER, &m, &cookie, &l, NULL, NULL);
   fail_unless (iter != NULL);

   filter = gst_iterator_filter (iter, filter2_cb, NULL);
   filter2 = gst_iterator_filter (filter, filter4_cb, NULL);

   while (1) {
     res = gst_iterator_next (filter2, &item);
     if (res == GST_ITERATOR_DONE)
       break;
     fail_unless (res == GST_ITERATOR_OK);
     value = GPOINTER_TO_INT (g_value_get_pointer (&item));
     fail_unless_equals_int (value, expected);
     expected += 4;
   }

   /* clean up */
   g_value_unset (&item);
   gst_iterator_free (filter2);
   g_mutex_clear (&m);
   g_list_free (l);
 }

 GST_END_TEST;

 static gint
 filter4_lock_cb (gconstpointer a, gconstpointer b)
 {
   const GValue *va = a;
   const GValue *vb = b;
   gint ia;
   GMutex *m;

   ia = GPOINTER_TO_INT (g_value_get_pointer (va));

   m = g_value_get_pointer (vb);
   g_mutex_lock (m);
   g_mutex_unlock (m);

   return ia % 4;
 }

 GST_START_TEST (test_filter_of_filter_locking)
 {
   GList *l;
   guint32 cookie = 0;
   GMutex m;
   GstIterator *iter, *filter, *filter2;
   GstIteratorResult res;
   GValue item = { 0, };
   GValue user_data = { 0, };
   gint expected = 0, value;

   l = make_list_of_ints (NUM_ELEMENTS);
   g_mutex_init (&m);
   iter = gst_iterator_new_list (G_TYPE_POINTER, &m, &cookie, &l, NULL, NULL);
   fail_unless (iter != NULL);

   g_value_init (&user_data, G_TYPE_POINTER);
   g_value_set_pointer (&user_data, &m);

   filter = gst_iterator_filter (iter, filter2_lock_cb, &user_data);
   filter2 = gst_iterator_filter (filter, filter4_lock_cb, &user_data);

   while (1) {
     res = gst_iterator_next (filter2, &item);
     if (res == GST_ITERATOR_DONE)
       break;
     fail_unless (res == GST_ITERATOR_OK);
     value = GPOINTER_TO_INT (g_value_get_pointer (&item));
     fail_unless_equals_int (value, expected);
     expected += 4;
   }

   /* clean up */
   g_value_unset (&item);
   g_value_unset (&user_data);
   gst_iterator_free (filter2);
   g_mutex_clear (&m);
   g_list_free (l);
 }

 GST_END_TEST;

 static Suite *
 gst_iterator_suite (void)
 {
   Suite *s = suite_create ("GstIterator");
   TCase *tc_chain = tcase_create ("correctness");

   tcase_set_timeout (tc_chain, 0);

   suite_add_tcase (s, tc_chain);
   tcase_add_test (tc_chain, test_manual_iteration);
   tcase_add_test (tc_chain, test_resync);
   tcase_add_test (tc_chain, test_fold);
   tcase_add_test (tc_chain, test_single);
   tcase_add_test (tc_chain, test_filter);
   tcase_add_test (tc_chain, test_filter_locking);
   tcase_add_test (tc_chain, test_filter_of_filter);
   tcase_add_test (tc_chain, test_filter_of_filter_locking);
   return s;
 }

 GST_CHECK_MAIN (gst_iterator);
	/* GStreamer
	* Copyright (C) 2005 Andy Wingo <wingo@pobox.com>
	*
	* gstiterator.c: Unit test for iterators
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Library General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Library General Public License for more details.
	*
	* You should have received a copy of the GNU Library General Public
	* License along with this library; if not, write to the
	* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/


	#include <gst/check/gstcheck.h>


	static GList *
	make_list_of_ints (gint n)
	{
	GList *ret = NULL;
	gint i;

	for (i = 0; i < n; i++)
	ret = g_list_prepend (ret, GINT_TO_POINTER (i));

	return g_list_reverse (ret);
	}

	#define NUM_ELEMENTS 10

	GST_START_TEST (test_manual_iteration)
	{
	GList *l;
	guint32 cookie = 0;
	GMutex m;
	GstIterator *iter;
	GstIteratorResult res;
	GValue item = { 0, };
	gint i = 0;

	l = make_list_of_ints (NUM_ELEMENTS);
	g_mutex_init (&m);

	iter = gst_iterator_new_list (G_TYPE_POINTER, &m, &cookie, &l, NULL, NULL);

	fail_unless (iter != NULL);

	while (1) {
	res = gst_iterator_next (iter, &item);
	if (i < NUM_ELEMENTS) {
	fail_unless (res == GST_ITERATOR_OK);
	fail_unless (GPOINTER_TO_INT (g_value_get_pointer (&item)) == i);
	g_value_reset (&item);
	i++;
	continue;
	} else {
	fail_unless (res == GST_ITERATOR_DONE);
	break;
	}
	}
	/* clean up */
	g_value_unset (&item);
	gst_iterator_free (iter);
	g_mutex_clear (&m);
	g_list_free (l);
	}

	GST_END_TEST;

	GST_START_TEST (test_resync)
	{
	GList *l;
	guint32 cookie = 0;
	GMutex m;
	GstIterator *iter;
	GstIteratorResult res;
	GValue item = { 0, };
	gint i = 0;
	gboolean hacked_list = FALSE;

	l = make_list_of_ints (NUM_ELEMENTS);
	g_mutex_init (&m);

	iter = gst_iterator_new_list (G_TYPE_POINTER, &m, &cookie, &l, NULL, NULL);

	fail_unless (iter != NULL);

	while (1) {
	res = gst_iterator_next (iter, &item);
	if (i < NUM_ELEMENTS / 2) {
	fail_unless (res == GST_ITERATOR_OK);
	fail_unless (GPOINTER_TO_INT (g_value_get_pointer (&item)) == i);
	g_value_reset (&item);
	i++;
	continue;
	} else if (!hacked_list) {
	/* here's where we test resync */
	fail_unless (res == GST_ITERATOR_OK);
	g_value_reset (&item);
	l = g_list_prepend (l, GINT_TO_POINTER (-1));
	cookie++;
	hacked_list = TRUE;
	continue;
	} else {
	fail_unless (res == GST_ITERATOR_RESYNC);
	gst_iterator_resync (iter);
	res = gst_iterator_next (iter, &item);
	fail_unless (res == GST_ITERATOR_OK);
	fail_unless (GPOINTER_TO_INT (g_value_get_pointer (&item)) == -1);
	g_value_reset (&item);
	break;
	}
	}

	/* clean up */
	g_value_unset (&item);
	gst_iterator_free (iter);
	g_mutex_clear (&m);
	g_list_free (l);
	}

	GST_END_TEST;

	static gboolean
	add_fold_func (const GValue * item, GValue * ret, gpointer user_data)
	{
	g_value_set_int (ret,
	g_value_get_int (ret) + GPOINTER_TO_INT (g_value_get_pointer (item)));
	return TRUE;
	}

	GST_START_TEST (test_fold)
	{
	GList *l;
	guint32 cookie = 0;
	GMutex m;
	GstIterator *iter;
	GstIteratorResult res;
	gint i, expected;
	GValue ret = { 0, };

	l = make_list_of_ints (NUM_ELEMENTS);
	g_mutex_init (&m);
	iter = gst_iterator_new_list (G_TYPE_POINTER, &m, &cookie, &l, NULL, NULL);
	fail_unless (iter != NULL);

	expected = 0;
	for (i = 0; i < NUM_ELEMENTS; i++)
	expected += i;

	g_value_init (&ret, G_TYPE_INT);
	g_value_set_int (&ret, 0);

	res = gst_iterator_fold (iter, add_fold_func, &ret, NULL);

	fail_unless (res == GST_ITERATOR_DONE);
	fail_unless (g_value_get_int (&ret) == expected);

	/* clean up */
	gst_iterator_free (iter);
	g_mutex_clear (&m);
	g_list_free (l);
	}

	GST_END_TEST;

	GST_START_TEST (test_single)
	{
	GstIterator *it;
	GstStructure *s = gst_structure_new_empty ("test");
	GValue v = { 0, };
	GstStructure *i;

	g_value_init (&v, GST_TYPE_STRUCTURE);
	g_value_set_boxed (&v, s);
	it = gst_iterator_new_single (GST_TYPE_STRUCTURE, &v);
	g_value_reset (&v);

	fail_unless (gst_iterator_next (it, &v) == GST_ITERATOR_OK);
	i = g_value_get_boxed (&v);
	fail_unless (strcmp (gst_structure_get_name (s),
	gst_structure_get_name (i)) == 0);
	i = NULL;
	g_value_reset (&v);

	fail_unless (gst_iterator_next (it, &v) == GST_ITERATOR_DONE);
	fail_unless (g_value_get_boxed (&v) == NULL);

	gst_iterator_free (it);
	gst_structure_free (s);

	it = gst_iterator_new_single (GST_TYPE_STRUCTURE, NULL);

	fail_unless (gst_iterator_next (it, &v) == GST_ITERATOR_DONE);
	fail_unless (g_value_get_boxed (&v) == NULL);

	g_value_reset (&v);

	gst_iterator_free (it);
	}

	GST_END_TEST;

	static gint
	filter2_cb (gconstpointer a, gconstpointer b)
	{
	const GValue *va = a;
	gint ia;

	ia = GPOINTER_TO_INT (g_value_get_pointer (va));

	return ia % 2;
	}

	GST_START_TEST (test_filter)
	{
	GList *l;
	guint32 cookie = 0;
	GMutex m;
	GstIterator iter, filter;
	GstIteratorResult res;
	GValue item = { 0, };
	gint expected = 0, value;

	l = make_list_of_ints (NUM_ELEMENTS);
	g_mutex_init (&m);
	iter = gst_iterator_new_list (G_TYPE_POINTER, &m, &cookie, &l, NULL, NULL);
	fail_unless (iter != NULL);

	filter = gst_iterator_filter (iter, filter2_cb, NULL);

	while (1) {
	res = gst_iterator_next (filter, &item);
	if (res == GST_ITERATOR_DONE)
	break;
	fail_unless (res == GST_ITERATOR_OK);
	value = GPOINTER_TO_INT (g_value_get_pointer (&item));
	fail_unless_equals_int (value, expected);
	expected += 2;
	}

	/* clean up */
	g_value_unset (&item);
	gst_iterator_free (filter);
	g_mutex_clear (&m);
	g_list_free (l);
	}

	GST_END_TEST;

	static gint
	filter2_lock_cb (gconstpointer a, gconstpointer b)
	{
	const GValue *va = a;
	const GValue *vb = b;
	gint ia;
	GMutex *m;

	ia = GPOINTER_TO_INT (g_value_get_pointer (va));

	m = g_value_get_pointer (vb);
	g_mutex_lock (m);
	g_mutex_unlock (m);

	return ia % 2;
	}

	GST_START_TEST (test_filter_locking)
	{
	GList *l;
	guint32 cookie = 0;
	GMutex m;
	GstIterator iter, filter;
	GstIteratorResult res;
	GValue item = { 0, };
	GValue user_data = { 0, };
	gint expected = 0, value;

	l = make_list_of_ints (NUM_ELEMENTS);
	g_mutex_init (&m);
	iter = gst_iterator_new_list (G_TYPE_POINTER, &m, &cookie, &l, NULL, NULL);
	fail_unless (iter != NULL);

	g_value_init (&user_data, G_TYPE_POINTER);
	g_value_set_pointer (&user_data, &m);

	filter = gst_iterator_filter (iter, filter2_lock_cb, &user_data);

	while (1) {
	res = gst_iterator_next (filter, &item);
	if (res == GST_ITERATOR_DONE)
	break;
	fail_unless (res == GST_ITERATOR_OK);
	value = GPOINTER_TO_INT (g_value_get_pointer (&item));
	fail_unless_equals_int (value, expected);
	expected += 2;
	}

	/* clean up */
	g_value_unset (&item);
	g_value_unset (&user_data);
	gst_iterator_free (filter);
	g_mutex_clear (&m);
	g_list_free (l);
	}

	GST_END_TEST;

	static gint
	filter4_cb (gconstpointer a, gconstpointer b)
	{
	const GValue *va = a;
	gint ia;

	ia = GPOINTER_TO_INT (g_value_get_pointer (va));

	return ia % 4;
	}

	GST_START_TEST (test_filter_of_filter)
	{
	GList *l;
	guint32 cookie = 0;
	GMutex m;
	GstIterator iter, filter, *filter2;
	GstIteratorResult res;
	GValue item = { 0, };
	gint expected = 0, value;

	l = make_list_of_ints (NUM_ELEMENTS);
	g_mutex_init (&m);
	iter = gst_iterator_new_list (G_TYPE_POINTER, &m, &cookie, &l, NULL, NULL);
	fail_unless (iter != NULL);

	filter = gst_iterator_filter (iter, filter2_cb, NULL);
	filter2 = gst_iterator_filter (filter, filter4_cb, NULL);

	while (1) {
	res = gst_iterator_next (filter2, &item);
	if (res == GST_ITERATOR_DONE)
	break;
	fail_unless (res == GST_ITERATOR_OK);
	value = GPOINTER_TO_INT (g_value_get_pointer (&item));
	fail_unless_equals_int (value, expected);
	expected += 4;
	}

	/* clean up */
	g_value_unset (&item);
	gst_iterator_free (filter2);
	g_mutex_clear (&m);
	g_list_free (l);
	}

	GST_END_TEST;

	static gint
	filter4_lock_cb (gconstpointer a, gconstpointer b)
	{
	const GValue *va = a;
	const GValue *vb = b;
	gint ia;
	GMutex *m;

	ia = GPOINTER_TO_INT (g_value_get_pointer (va));

	m = g_value_get_pointer (vb);
	g_mutex_lock (m);
	g_mutex_unlock (m);

	return ia % 4;
	}

	GST_START_TEST (test_filter_of_filter_locking)
	{
	GList *l;
	guint32 cookie = 0;
	GMutex m;
	GstIterator iter, filter, *filter2;
	GstIteratorResult res;
	GValue item = { 0, };
	GValue user_data = { 0, };
	gint expected = 0, value;

	l = make_list_of_ints (NUM_ELEMENTS);
	g_mutex_init (&m);
	iter = gst_iterator_new_list (G_TYPE_POINTER, &m, &cookie, &l, NULL, NULL);
	fail_unless (iter != NULL);

	g_value_init (&user_data, G_TYPE_POINTER);
	g_value_set_pointer (&user_data, &m);

	filter = gst_iterator_filter (iter, filter2_lock_cb, &user_data);
	filter2 = gst_iterator_filter (filter, filter4_lock_cb, &user_data);

	while (1) {
	res = gst_iterator_next (filter2, &item);
	if (res == GST_ITERATOR_DONE)
	break;
	fail_unless (res == GST_ITERATOR_OK);
	value = GPOINTER_TO_INT (g_value_get_pointer (&item));
	fail_unless_equals_int (value, expected);
	expected += 4;
	}

	/* clean up */
	g_value_unset (&item);
	g_value_unset (&user_data);
	gst_iterator_free (filter2);
	g_mutex_clear (&m);
	g_list_free (l);
	}

	GST_END_TEST;

	static Suite *
	gst_iterator_suite (void)
	{
	Suite *s = suite_create ("GstIterator");
	TCase *tc_chain = tcase_create ("correctness");

	tcase_set_timeout (tc_chain, 0);

	suite_add_tcase (s, tc_chain);
	tcase_add_test (tc_chain, test_manual_iteration);
	tcase_add_test (tc_chain, test_resync);
	tcase_add_test (tc_chain, test_fold);
	tcase_add_test (tc_chain, test_single);
	tcase_add_test (tc_chain, test_filter);
	tcase_add_test (tc_chain, test_filter_locking);
	tcase_add_test (tc_chain, test_filter_of_filter);
	tcase_add_test (tc_chain, test_filter_of_filter_locking);
	return s;
	}

	GST_CHECK_MAIN (gst_iterator);