initial release, shared object for use among threads

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@356 0778d3d1-df1d-0410-868b-ea421aaaa00d

include/shared_object.h

@@ -0,0 +1,82 @@
+/*
+ * shared_object.h - class sharedObject for use among threads
+ *
+ * Copyright (c) 2006 Javier Serrano Polo <jasp00/at/users.sourceforge.net>
+ * 
+ * This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ */
+
+
+#ifndef _SHARED_OBJECT_H
+#define _SHARED_OBJECT_H
+
+#ifdef QT4
+
+#include <QtCore/QMutex>
+
+#else
+
+#include <qmutex.h>
+
+#endif
+
+
+
+
+class sharedObject
+{
+public:
+	sharedObject( void ) :
+		m_reference_count( 1 )
+	{
+	}
+
+	template<class T>
+	static T * ref( T * _object )
+	{
+		_object->m_reference_mutex.lock();
+		++_object->m_reference_count;
+		_object->m_reference_mutex.unlock();
+		return( _object );
+	}
+
+	template<class T>
+	static void unref( T * _object )
+	{
+		_object->m_reference_mutex.lock();
+		bool delete_object = --_object->m_reference_count == 0;
+		_object->m_reference_mutex.unlock();
+		if ( delete_object )
+		{
+			delete _object;
+		}
+	}
+
+
+private:
+	unsigned m_reference_count;
+	QMutex m_reference_mutex;
+
+} ;
+
+
+
+
+#endif
+