From: Jeff Layton <jlayton@poochiereds.net>
Date: Thu, 30 Apr 2015 11:50:05 +0000 (-0400)
Subject: urcu: add cds_list_for_each_entry_safe_from macro
X-Git-Tag: v0.9.0~59
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=16d8b5dfd6b482bedd99d796a4f70f61df3fb504;p=urcu.git

urcu: add cds_list_for_each_entry_safe_from macro

Same as cds_list_for_each_entry_safe, but starts at an arbitrary point
within the list instead of at the head.

Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/urcu/list.h b/urcu/list.h
index b4962b4..4aaf869 100644
--- a/urcu/list.h
+++ b/urcu/list.h
@@ -171,6 +171,15 @@ void cds_list_splice(struct cds_list_head *add, struct cds_list_head *head)
 		&pos->member != (head); \
 		pos = p, p = cds_list_entry(pos->member.next, __typeof__(*pos), member))
 
+/*
+ * Same as cds_list_for_each_entry_safe, but starts from "pos" which should
+ * point to an entry within the list.
+ */
+#define cds_list_for_each_entry_safe_from(pos, p, head, member) \
+        for (p = cds_list_entry(pos->member.next, __typeof__(*pos), member); \
+                &pos->member != (head); \
+                pos = p, p = cds_list_entry(pos->member.next, __typeof__(*pos), member))
+
 static inline
 int cds_list_empty(struct cds_list_head *head)
 {