From: Lightweight Patch Manager <patch@luckynet.dynu.com>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Cc: Tomas Szepe <szepe@pinerecords.com>, Ingo Molnar <mingo@elte.hu>
Subject: [PATCH][2.5] Single linked lists for Linux
Date: Wed, 25 Sep 2002 20:56:08 +0000 [thread overview]
Message-ID: <20020925205608.1BD86F@hawkeye.luckynet.adm> (raw)
This introduces single linked lists, as figured out by us four. Works
fine with userspace test applications, should work fine with e.g. the
scheduler. Breaks nothing. Must get adopted.
--- /dev/null Wed Dec 31 17:00:00 1969
+++ slist-2.5/include/linux/slist.h Wed Sep 25 14:49:24 2002
@@ -0,0 +1,103 @@
+#ifdef __KERNEL__
+#ifndef _LINUX_SLIST_H
+#define _LINUX_SLIST_H
+
+#include <asm/processor.h>
+
+/*
+ * Type-safe single linked list helper-functions.
+ * (originally taken from list.h)
+ *
+ * Thomas 'Dent' Mirlacher, Daniel Phillips, Andreas Borgk,
+ * Thunder from the hill
+ */
+
+/**
+ * slist_add_front - add a new entry at the first slot, moving the old head
+ * to the second slot
+ * @new: new entry to be added
+ * @head: head of the single linked list
+ *
+ * Insert a new entry before the specified head.
+ * This is good for implementing stacks.
+ */
+
+#define slist_add_front(_new, _head) \
+do { \
+ (_new)->next = (_head); \
+ (_head) = (_new); \
+} while (0)
+
+
+
+/**
+ * slist_add - add a new entry
+ * @new: new entry to be added
+ * @head: head of the single linked list
+ *
+ * Insert a new entry before the specified head.
+ * This is good for implementing stacks.
+ *
+ * Careful: if you do this concurrently, _head
+ * might get into nirvana...
+ */
+#define slist_add(_new, _head) \
+do { \
+ (_new)->next = (_head)->next; \
+ (_head)->next = (_new); \
+ (_new) = (_head); \
+} while (0)
+
+/**
+ * slist_del - remove an entry from list
+ * @head: head to remove it from
+ * @entry: entry to be removed
+ */
+#define slist_del(_head, _entry) \
+do { \
+ (_head)->next = (_entry)->next; \
+ (_entry)->next = NULL; \
+}
+
+/**
+ * slist_del_single - untag a list from an entry
+ * @list: list entry to be untagged
+ */
+#define slist_del_single(_list) \
+ (_list)->next = NULL
+
+/**
+ * slist_pop - pop out list entry
+ * @list: entry to be popped out
+ *
+ * Pop out an entry from a list.
+ */
+#define slist_pop(_list) ({ \
+ typeof(_list) _NODE_ = _list; \
+ if (_list) { \
+ (_list) = (_list)->next; \
+ _NODE_->next = NULL; \
+ } \
+ _NODE_; })
+
+/**
+ * slist_for_each - iterate over a list
+ * @pos: the pointer to use as a loop counter.
+ * @head: the head for your list (this is also the first entry).
+ */
+#define slist_for_each(pos, head) \
+ for (pos = head; pos && ({ prefetch(pos->next); 1; }); \
+ pos = pos->next)
+
+/**
+ * slist_for_each_del - iterate over a list, popping off entries
+ * @pos: the pointer to use as a loop counter.
+ * @head: the head for your list (this is also the first entry).
+ */
+#define slist_for_each_del(pos, head) \
+ for (pos = slist_pop(head); pos && \
+ ({ prefetch(pos->next); 1; }); \
+ pos = slist_pop(head))
+
+#endif /* _LINUX_SLIST_H */
+#endif /* __KERNEL__ */
--
Lightweight Patch Manager, without pine.
If you have any objections (apart from who I am), tell me
next reply other threads:[~2002-09-25 20:50 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-25 20:56 Lightweight Patch Manager [this message]
2002-09-25 21:11 ` [PATCH][2.5] Single linked lists for Linux Rik van Riel
2002-09-25 21:23 ` Thunder from the hill
2002-09-25 21:17 ` Mark Mielke
[not found] <83015759@toto.iv>
2002-09-26 0:14 ` Peter Chubb
2002-09-26 0:25 ` Zwane Mwaikambo
2002-09-26 0:35 ` Rik van Riel
2002-09-26 6:42 ` Thunder from the hill
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