svn commit: r216149 - head/sys/sys

[Konstantin Belousov]

Author: kib
Date: Fri Dec  3 16:07:50 2010
New Revision: 216149
URL: http://svn.freebsd.org/changeset/base/216149

Log:
  Add SLIST_SWAP() macro.
  
  MFC after:	1 week

Modified:
  head/sys/sys/queue.h

Modified: head/sys/sys/queue.h
==============================================================================
--- head/sys/sys/queue.h	Fri Dec  3 14:20:20 2010	(r216148)
+++ head/sys/sys/queue.h	Fri Dec  3 16:07:50 2010	(r216149)
@@ -213,6 +213,12 @@ struct {								\
 	SLIST_FIRST((head)) = SLIST_NEXT(SLIST_FIRST((head)), field);	\
 } while (0)
 
+#define SLIST_SWAP(head1, head2, type) do {				\
+	struct type *swap_first = SLIST_FIRST(head1);			\
+	SLIST_FIRST(head1) = SLIST_FIRST(head2);			\
+	SLIST_FIRST(head2) = swap_first;				\
+} while (0)
+
 /*
  * Singly-linked Tail queue declarations.
  */