svn commit: r216352 - stable/8/sys/sys

[Konstantin Belousov]

Author: kib
Date: Fri Dec 10 10:37:53 2010
New Revision: 216352
URL: http://svn.freebsd.org/changeset/base/216352

Log:
  MFC r216149:
  Add SLIST_SWAP() macro.
  
  Approved by:	re (bz)

Modified:
  stable/8/sys/sys/queue.h
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)

Modified: stable/8/sys/sys/queue.h
==============================================================================
--- stable/8/sys/sys/queue.h	Fri Dec 10 08:53:06 2010	(r216351)
+++ stable/8/sys/sys/queue.h	Fri Dec 10 10:37:53 2010	(r216352)
@@ -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.
  */