[0.93.1] make ringbuffer.h work for C++

git-svn-id: svn+ssh://jackaudio.org/trunk/jack@597 0c269be4-1314-0410-8aa9-9f06e86f4224

configure.in

@@ -15,7 +15,7 @@ dnl                 changes are made
 dnl ---
 JACK_MAJOR_VERSION=0
 JACK_MINOR_VERSION=93
-JACK_MICRO_VERSION=0
+JACK_MICRO_VERSION=1
 
 dnl ---
 dnl HOWTO: updating the jack protocal version

jack/ringbuffer.h

@@ -1,6 +1,31 @@
+/*
+    Copyright (C) 2000 Paul Davis
+    Copyright (C) 2003 Rohan Drape
+    
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 2.1 of the License, or
+    (at your option) any later version.
+    
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+    
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program; if not, write to the Free Software 
+    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+    $Id$
+*/
+
 #ifndef _RINGBUFFER_H
 #define _RINGBUFFER_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #include <sys/types.h>
 
 /** @file ringbuffer.h
@@ -186,4 +211,8 @@ void jack_ringbuffer_write_advance(jack_ringbuffer_t *rb, size_t cnt);
 size_t jack_ringbuffer_write_space(jack_ringbuffer_t *rb);
 
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif