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authorAndrew Tridgell <tridge@samba.org>1998-08-17 06:47:53 +0000
committerAndrew Tridgell <tridge@samba.org>1998-08-17 06:47:53 +0000
commit72ed7049d88e5296ebec362189e62a384385ad34 (patch)
tree4609523acc63ae3e14201b49a4b9c47d1ec8e4d6 /source3/include
parent69c6f1624d79e4cf4296856d66216cca90863286 (diff)
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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)
Diffstat (limited to 'source3/include')
-rw-r--r--source3/include/dlinklist.h52
-rw-r--r--source3/include/includes.h2
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 */