[glib] Make g_type_class_peek[_static]() not take any locks

[Alexander Larsson <alexl src gnome org>]

commit 5cac5c828b9d56ed0b1932deb7364d6ba926eb96
Author: Benjamin Otte <otte gnome org>
Date:   Thu Sep 24 14:57:19 2009 +0200

    Make g_type_class_peek[_static]() not take any locks
    
    By replacing a check for node->data with a check for NODE_REFCOUNT(node)
    these functions don't require a read lock anymore.

 gobject/gtype.c |    8 ++------
 1 files changed, 2 insertions(+), 6 deletions(-)
---
diff --git a/gobject/gtype.c b/gobject/gtype.c
index 412e9cc..d0f1c99 100644
--- a/gobject/gtype.c
+++ b/gobject/gtype.c
@@ -2950,14 +2950,12 @@ g_type_class_peek (GType type)
   gpointer class;
   
   node = lookup_type_node_I (type);
-  G_READ_LOCK (&type_rw_lock);
-  if (node && node->is_classed && node->data &&
+  if (node && node->is_classed && NODE_REFCOUNT (node) > 0 &&
       g_atomic_int_get (&node->data->class.init_state) == INITIALIZED)
     /* ref_count _may_ be 0 */
     class = node->data->class.class;
   else
     class = NULL;
-  G_READ_UNLOCK (&type_rw_lock);
   
   return class;
 }
@@ -2980,15 +2978,13 @@ g_type_class_peek_static (GType type)
   gpointer class;
   
   node = lookup_type_node_I (type);
-  G_READ_LOCK (&type_rw_lock);
-  if (node && node->is_classed && node->data &&
+  if (node && node->is_classed && NODE_REFCOUNT (node) &&
       /* peek only static types: */ node->plugin == NULL &&
       g_atomic_int_get (&node->data->class.init_state) == INITIALIZED)
     /* ref_count _may_ be 0 */
     class = node->data->class.class;
   else
     class = NULL;
-  G_READ_UNLOCK (&type_rw_lock);
   
   return class;
 }