gst/: Since remove is virtual in GstBin we must not assume the elements GList to have anothing usefull.

Original commit message from CVS:
* gst/gstbin.c: (gst_bin_remove), (gst_bin_dispose):
* gst/gstthread.c: (gst_thread_dispose), (gst_thread_catch),
(gst_thread_main_loop):
Since remove is virtual in GstBin we must not assume the
elements GList to have anothing usefull.
Add some more logging to GstThread and be a bit more paranoid
when resetting the scheduler.
Set the state of the bin to NULL before removing the children.

ChangeLog

@@ -1,3 +1,14 @@
+2004-07-09  Wim Taymans  <wim@fluendo.com>
+
+	* gst/gstbin.c: (gst_bin_remove), (gst_bin_dispose):
+	* gst/gstthread.c: (gst_thread_dispose), (gst_thread_catch),
+	(gst_thread_main_loop):
+	Since remove is virtual in GstBin we must not assume the 
+	elements GList to have anothing usefull.
+	Add some more logging to GstThread and be a bit more paranoid
+	when resetting the scheduler.
+	Set the state of the bin to NULL before removing the children.
+
 2004-07-09  Zaheer Abbas Merali  <zaheerabbas at merali dot org>
 
 	* testsuite/threads/Makefile.am:

gst/gstbin.c

@@ -588,7 +588,6 @@ gst_bin_remove (GstBin * bin, GstElement * element)
 
   g_return_if_fail (GST_IS_BIN (bin));
   g_return_if_fail (GST_IS_ELEMENT (element));
-  g_return_if_fail (bin->children != NULL);
 
   bclass = GST_BIN_GET_CLASS (bin);
 
@@ -833,8 +832,7 @@ gst_bin_dispose (GObject * object)
 
   GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, object, "dispose");
 
-  if (gst_element_get_state (GST_ELEMENT (object)) == GST_STATE_PLAYING)
+  gst_element_set_state (GST_ELEMENT (object), GST_STATE_NULL);
-    gst_element_set_state (GST_ELEMENT (object), GST_STATE_PAUSED);
 
   while (bin->children) {
     gst_bin_remove (bin, GST_ELEMENT (bin->children->data));

gst/gstthread.c

@@ -223,6 +223,8 @@ gst_thread_dispose (GObject * object)
 
   g_assert (GST_STATE (thread) == GST_STATE_NULL);
 
+  GST_CAT_DEBUG (GST_CAT_REFCOUNTING, "GstThread: dispose, freeing locks");
+
   g_mutex_free (thread->lock);
   g_cond_free (thread->cond);
 
@@ -369,12 +371,14 @@ gst_thread_catch (GstThread * thread)
   if (thread == gst_thread_get_current ()) {
     /* we're trying to catch ourself */
     if (!GST_FLAG_IS_SET (thread, GST_THREAD_MUTEX_LOCKED)) {
+      GST_DEBUG_OBJECT (thread, "catching itself, grabbing lock");
       g_mutex_lock (thread->lock);
       GST_FLAG_SET (thread, GST_THREAD_MUTEX_LOCKED);
     }
     GST_DEBUG_OBJECT (thread, "catching itself");
     GST_FLAG_UNSET (thread, GST_THREAD_STATE_SPINNING);
   } else {
+    GST_DEBUG_OBJECT (thread, "catching thread, grabbing lock");
     /* another thread is trying to catch us */
     g_mutex_lock (thread->lock);
     wait = !GST_FLAG_IS_SET (thread, GST_THREAD_STATE_SPINNING);
@@ -555,6 +559,7 @@ gst_thread_main_loop (void *arg)
 {
   GstThread *thread = NULL;
   gboolean status;
+  GstScheduler *sched;
 
   thread = GST_THREAD (arg);
   g_mutex_lock (thread->lock);
@@ -595,7 +600,9 @@ gst_thread_main_loop (void *arg)
 
   /* we need to destroy the scheduler here because it has mapped it's
    * stack into the threads stack space */
-  gst_scheduler_reset (GST_ELEMENT_SCHED (thread));
+  sched = GST_ELEMENT_SCHED (thread);
+  if (sched)
+    gst_scheduler_reset (sched);
 
   /* must do that before releasing the lock - we might get disposed before being done */
   g_signal_emit (G_OBJECT (thread), gst_thread_signals[SHUTDOWN], 0);