Add configure test for garbage collector friendliness for GLib. If

2000-04-17  Sebastian Wilhelmi  <wilhelmi@ira.uka.de>

	* configure.in, acconfig.h: Add configure test for garbage
	collector friendliness for GLib. If enabled, ENABLE_GC_FRIENDLY
	will be defined.

	* garray.c, ghash.c, glist.c, gmain.c, gmem.c, gnode.c, gqueue.c,
	gslist.c, gtree.c: If ENABLE_GC_FRIENDLY is defined, NULLify all
	memory released by the user, but cached by GLib. This lets a
	garbage collector have a more correct view of the actually used
	memory.

1 files changed, 14 insertions, 2 deletions

diff --git a/gslist.c b/gslist.c
index 2f01673b0..bcb481f05 100644
--- a/gslist.c
+++ b/gslist.c
@@ -151,9 +151,21 @@ g_slist_free (GSList *list)
 {
   if (list)
     {
-      list->data = list->next;
+      GSList *last_node = list;
+  
+#ifdef ENABLE_GC_FRIENDLY
+      while (last_node->next)
+	{
+	  last_node->data = NULL;
+	  last_node = last_node->next;
+	}
+      last_node->data = NULL
+#else /* !ENABLE_GC_FRIENDLY */
+      list->data = list->next;  
+#endif /* ENABLE_GC_FRIENDLY */
+	
       G_LOCK (current_allocator);
-      list->next = current_allocator->free_lists;
+      last_node->next = current_allocator->free_lists;
       current_allocator->free_lists = list;
       G_UNLOCK (current_allocator);
     }