From 74bc575ad1adb8e50eb8fbbef34839f458ec1988 Mon Sep 17 00:00:00 2001
From: Tobias Doerffel <tobias.doerffel@gmail.com>
Date: Tue, 4 Mar 2008 11:28:58 +0000
Subject: [PATCH] added mutex to protect reference-counter

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@766 0778d3d1-df1d-0410-868b-ea421aaaa00d
---
 include/shared_object.h | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/include/shared_object.h b/include/shared_object.h
index d0d45a230..399373296 100644
--- a/include/shared_object.h
+++ b/include/shared_object.h
@@ -2,6 +2,7 @@
  * shared_object.h - class sharedObject for use among other objects
  *
  * Copyright (c) 2006-2007 Javier Serrano Polo <jasp00/at/users.sourceforge.net>
+ * Copyright (c) 2008 Tobias Doerffel <tobydox/at/users.sourceforge.net>
  * 
  * This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
  *
@@ -27,28 +28,34 @@
 #define _SHARED_OBJECT_H
 
 
+#include <QtCore/QMutex>
 
 
 class sharedObject
 {
 public:
 	sharedObject( void ) :
-		m_reference_count( 1 )
+		m_referenceCount( 1 ),
+		m_lock()
 	{
 	}
 
 	template<class T>
 	static T * ref( T * _object )
 	{
+		_object->m_lock.lock();
 		// TODO: Use QShared
-		++_object->m_reference_count;
+		++_object->m_referenceCount;
+		_object->m_lock.unlock();
 		return( _object );
 	}
 
 	template<class T>
 	static void unref( T * _object )
 	{
-		bool delete_object = --_object->m_reference_count == 0;
+		_object->m_lock.lock();
+		bool delete_object = --_object->m_referenceCount <= 0;
+		_object->m_lock.unlock();
 		if ( delete_object )
 		{
 			delete _object;
@@ -57,7 +64,8 @@ public:
 
 
 private:
-	unsigned m_reference_count;
+	int m_referenceCount;
+	QMutex m_lock;
 
 } ;