From d63f2964cef2d43964bc4bf9b2de6df11af1e260 Mon Sep 17 00:00:00 2001
From: Eric van Gyzen <vangyzen@FreeBSD.org>
Date: Mon, 13 Nov 2017 16:53:36 +0000
Subject: [PATCH] Add __BEGIN_DECLS and __END_DECLS to <sys/umtx.h>

This allows C++ programs to call _umtx_op().

MFC after:	3 days
Sponsored by:	Dell EMC
---
 sys/sys/umtx.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/sys/umtx.h b/sys/sys/umtx.h
index d2ff5acd0b7..dfd6be54000 100644
--- a/sys/sys/umtx.h
+++ b/sys/sys/umtx.h
@@ -122,8 +122,12 @@ struct umtx_robust_lists_params {
 
 #ifndef _KERNEL
 
+__BEGIN_DECLS
+
 int _umtx_op(void *obj, int op, u_long val, void *uaddr, void *uaddr2);
 
+__END_DECLS
+
 #else
 
 /*