added some optimisation for the case where the number of open files is

very large. files.c now promotes a files_struct to the top of the list
if it is used when it is more than 10 elements from the top.

also moved common linked list code for the 5 sets of linked lists that
I've created over the past few days into dlinklist.h (I've explained
to Chris why I didn't use the ubiqx code)
(This used to be commit 1eb9ae2996b5a243a147f485e7e353d54f820852)

2 files changed, 54 insertions, 0 deletions

diff --git a/source3/include/dlinklist.h b/source3/include/dlinklist.h
new file mode 100644
index 0000000000..8810eca5b9
--- /dev/null
+++ b/source3/include/dlinklist.h
@@ -0,0 +1,52 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 1.9.
+   some simple double linked list macros
+   Copyright (C) Andrew Tridgell 1998
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program 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 General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/* To use these macros you must have a structure containing a next and
+   prev pointer */
+
+
+/* hook into the front of the list */
+#define DLIST_ADD(list, p) \
+        if (!(list)) { \
+		(list) = (p); \
+		(p)->next = (p)->prev = NULL; \
+	} else { \
+		(list)->prev = (p); \
+		(p)->next = (list); \
+		(p)->prev = NULL; \
+		(list) = (p); \
+	}
+
+
+/* remove an element from a list */
+#define DLIST_REMOVE(list, p) \
+	if ((p) == (list)) { \
+		(list) = (p)->next; \
+		if (list) (list)->prev = NULL; \
+	} else { \
+		(p)->prev->next = (p)->next; \
+		if ((p)->next) (p)->next->prev = (p)->prev; \
+	}
+
+/* promote an element to the top of the list */
+#define DLIST_PROMOTE(list, p) \
+          DLIST_REMOVE(list, p) \
+          DLIST_ADD(list, p)
diff --git a/source3/include/includes.h b/source3/include/includes.h
index 4ced157359..3fd5f7be08 100644
--- a/source3/include/includes.h
+++ b/source3/include/includes.h
@@ -314,6 +314,8 @@ extern int errno;
 /* Lists, trees, caching, datbase... */
 #include "ubi_sLinkList.h"
 #include "ubi_dLinkList.h"
+#include "dlinklist.h"
+
 #ifndef UBI_BINTREE_H
 #include "ubi_Cache.h"
 #endif /* UBI_BINTREE_H */