From 7378d8481a7f0ed0a48c47c12fa53df87df6a12b Mon Sep 17 00:00:00 2001
From: Miod Vallat <miod@cvs.openbsd.org>
Date: Tue, 1 Jan 2008 23:37:17 +0000
Subject: Implement an MP-safe rw_cas() based upon the casx instruction; ok
 kettenis@

---
 sys/arch/sparc64/include/lock.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'sys/arch/sparc64')

diff --git a/sys/arch/sparc64/include/lock.h b/sys/arch/sparc64/include/lock.h
index c880043998b..7c8d35490a4 100644
--- a/sys/arch/sparc64/include/lock.h
+++ b/sys/arch/sparc64/include/lock.h
@@ -1,10 +1,11 @@
-/*	$OpenBSD: lock.h,v 1.2 2007/11/05 20:19:22 miod Exp $	*/
+/*	$OpenBSD: lock.h,v 1.3 2008/01/01 23:37:16 miod Exp $	*/
 
 /* public domain */
 
 #ifndef	_SPARC64_LOCK_H_
 #define	_SPARC64_LOCK_H_
 
+#include <machine/atomic.h>
 #include <machine/ctlreg.h>
 
 typedef volatile u_int8_t __cpu_simple_lock_t;
@@ -50,4 +51,6 @@ __cpu_simple_unlock(__cpu_simple_lock_t *l)
 	*l = __SIMPLELOCK_UNLOCKED;
 }
 
+#define	rw_cas_sparc64	(sparc64_casx(p, o, n) != o)
+
 #endif	/* _SPARC64_LOCK_H_ */
-- 
cgit v1.2.3