From 54bab03f04ec772da0bb22fd153b5351f77ea1f1 Mon Sep 17 00:00:00 2001
From: Pawel Jakub Dawidek <pjd@FreeBSD.org>
Date: Tue, 21 Dec 2004 18:32:46 +0000
Subject: [PATCH] Implement g_topology_try_lock().

No objection from:	phk
---
 sys/geom/geom.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/geom/geom.h b/sys/geom/geom.h
index c93053a1d5f..35255e8de71 100644
--- a/sys/geom/geom.h
+++ b/sys/geom/geom.h
@@ -310,6 +310,8 @@ extern struct sx topology_lock;
 		sx_xlock(&topology_lock);			\
 	} while (0)
 
+#define g_topology_try_lock()	sx_try_xlock(&topology_lock)
+
 #define g_topology_unlock()					\
 	do {							\
 		sx_xunlock(&topology_lock);			\