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From: Kip Macy <kmacy@FreeBSD.org>
Date: Fri, 21 Nov 2008 04:45:53 +0000 (UTC)
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Subject: svn commit: r185145 - user/kmacy/HEAD_fast_multi_xmit/sys/sys
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Author: kmacy
Date: Fri Nov 21 04:45:53 2008
New Revision: 185145
URL: http://svn.freebsd.org/changeset/base/185145

Log:
  safety check buf_ring_peek - assumes single-consumer

Modified:
  user/kmacy/HEAD_fast_multi_xmit/sys/sys/buf_ring.h

Modified: user/kmacy/HEAD_fast_multi_xmit/sys/sys/buf_ring.h
==============================================================================
--- user/kmacy/HEAD_fast_multi_xmit/sys/sys/buf_ring.h	Fri Nov 21 04:44:49 2008	(r185144)
+++ user/kmacy/HEAD_fast_multi_xmit/sys/sys/buf_ring.h	Fri Nov 21 04:45:53 2008	(r185145)
@@ -233,6 +233,11 @@ static __inline void *
 buf_ring_peek(struct buf_ring *br)
 {
 
+#ifdef DEBUG_BUFRING
+	if (!mtx_owned(br->br_lock))
+		panic("lock not held on single consumer dequeue");
+#endif	
+	mb();
 	return (br->br_ring[br->br_cons_tail]);
 }