diff --git a/apps/sample/trimesh_QT_shared/ml_atomic_guard.h b/apps/sample/trimesh_QT_shared/ml_atomic_guard.h
deleted file mode 100644
index b22a2bee..00000000
--- a/apps/sample/trimesh_QT_shared/ml_atomic_guard.h
+++ /dev/null
@@ -1,36 +0,0 @@
-#ifndef __ML_ATOMIC_GUARD_H
-#define __ML_ATOMIC_GUARD_H
-
-class MLAtomicGuard
-{
-public:
-	MLAtomicGuard(bool val)
-		:_lock(QReadWriteLock::Recursive),_guard(val) {}
-	
-	~MLAtomicGuard() {}
-
-	MLAtomicGuard& operator=(bool v)
-	{
-		QWriteLocker locker(&_lock);
-		_guard = v;
-		return *this;
-	}
-
-	bool operator==(bool v) const
-	{
-		QReadLocker locker(&_lock);
-		return (_guard == v);
-	}
-
-	bool operator!=(bool v) const
-	{
-		QReadLocker locker(&_lock);
-		return (_guard != v);
-	}
-
-private:
-	bool _guard;
-	mutable QReadWriteLock _lock;
-};
-
-#endif
\ No newline at end of file