I've written a simple application which creates a tree view, fills it and
shows it.
When running without gtk_thread_init all runs fine.
When running with gtk_thread_init the program hangs.

I've changed the thread_enter/leave code in a way to make it easier for
debugging and found that gtktreeview tries to obtain the lock a second time
which leads to hanging. After changing the call to use the function without
locking again it runs fine.

diff -urN -X gtk+-2.0.0-dontdiff gtk+-2.0.0-vanilla/gtk/gtktreeview.c
gtk+-2.0.0/gtk/gtktreeview.c
--- gtk+-2.0.0-vanilla/gtk/gtktreeview.c        Fri Mar  8 20:26:59 2002
+++ gtk+-2.0.0/gtk/gtktreeview.c        Sun Mar 10 10:01:52 2002
@@ -261,6 +261,7 @@
                                          GtkTreePath *path);
 static void     validate_visible_area    (GtkTreeView *tree_view);
 static gboolean validate_rows_handler    (GtkTreeView *tree_view);
+static gboolean do_validate_rows (GtkTreeView *tree_view);
 static gboolean presize_handler_callback (gpointer     data);
 static void     install_presize_handler  (GtkTreeView *tree_view);
 static void    gtk_tree_view_dy_to_top_row (GtkTreeView *tree_view);
@@ -1482,7 +1483,7 @@

   /* we validate 50 rows initially just to make sure we have some size */
   /* in practice, with a lot of static lists, this should get a good width */
-  validate_rows_handler (tree_view);
+  do_validate_rows (tree_view);
   gtk_tree_view_size_request_columns (tree_view);
   gtk_tree_view_update_size (GTK_TREE_VIEW (widget));