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author"Steven J. Hill" <sjhill@realitydiluted.com>2005-05-12 03:05:57 +0000
committer"Steven J. Hill" <sjhill@realitydiluted.com>2005-05-12 03:05:57 +0000
commit03196f15d10064639691c25fb7ed0d2924ec8d5b (patch)
tree298b3f10be69c031206577bd0bf8e502429adf39 /libpthread/nptl/sysdeps
parent8fd12d635659747c1f5530de035c232264932de5 (diff)
Added new common include file for list primitives used by NPTL.
Diffstat (limited to 'libpthread/nptl/sysdeps')
-rw-r--r--libpthread/nptl/sysdeps/pthread/list.h114
1 files changed, 114 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/pthread/list.h b/libpthread/nptl/sysdeps/pthread/list.h
new file mode 100644
index 000000000..43186a2d5
--- /dev/null
+++ b/libpthread/nptl/sysdeps/pthread/list.h
@@ -0,0 +1,114 @@
+/* Copyright (C) 2002 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#ifndef _LIST_H
+#define _LIST_H 1
+
+/* The definitions of this file are adopted from those which can be
+ found in the Linux kernel headers to enable people familiar with
+ the latter find their way in these sources as well. */
+
+
+/* Basic type for the double-link list. */
+typedef struct list_head
+{
+ struct list_head *next;
+ struct list_head *prev;
+} list_t;
+
+
+/* Define a variable with the head and tail of the list. */
+#define LIST_HEAD(name) \
+ list_t name = { &(name), &(name) }
+
+/* Initialize a new list head. */
+#define INIT_LIST_HEAD(ptr) \
+ (ptr)->next = (ptr)->prev = (ptr)
+
+
+/* Add new element at the head of the list. */
+static inline void
+list_add (list_t *newp, list_t *head)
+{
+ head->next->prev = newp;
+ newp->next = head->next;
+ newp->prev = head;
+ head->next = newp;
+}
+
+
+/* Add new element at the tail of the list. */
+static inline void
+list_add_tail (list_t *newp, list_t *head)
+{
+ head->prev->next = newp;
+ newp->next = head;
+ newp->prev = head->prev;
+ head->prev = newp;
+}
+
+
+/* Remove element from list. */
+static inline void
+list_del (list_t *elem)
+{
+ elem->next->prev = elem->prev;
+ elem->prev->next = elem->next;
+}
+
+
+/* Join two lists. */
+static inline void
+list_splice (list_t *add, list_t *head)
+{
+ /* Do nothing if the list which gets added is empty. */
+ if (add != add->next)
+ {
+ add->next->prev = head;
+ add->prev->next = head->next;
+ head->next->prev = add->prev;
+ head->next = add->next;
+ }
+}
+
+
+/* Get typed element from list at a given position. */
+#define list_entry(ptr, type, member) \
+ ((type *) ((char *) (ptr) - (unsigned long) (&((type *) 0)->member)))
+
+
+
+/* Iterate forward over the elements of the list. */
+#define list_for_each(pos, head) \
+ for (pos = (head)->next; pos != (head); pos = pos->next)
+
+
+/* Iterate forward over the elements of the list. */
+#define list_for_each_prev(pos, head) \
+ for (pos = (head)->prev; pos != (head); pos = pos->prev)
+
+
+/* Iterate backwards over the elements list. The list elements can be
+ removed from the list while doing this. */
+#define list_for_each_prev_safe(pos, p, head) \
+ for (pos = (head)->prev, p = pos->prev; \
+ pos != (head); \
+ pos = p, p = pos->prev)
+
+#endif /* list.h */