src/java.desktop/windows/native/libawt/windows/awt_Toolkit.h

@@ -383,11 +383,12 @@
     static VOID CALLBACK SecondaryIdleFunc();
     static BOOL CALLBACK CommonPeekMessageFunc(MSG& msg);
     static BOOL activateKeyboardLayout(HKL hkl);
 
     HANDLE m_waitEvent;
-    DWORD eventNumber;
+    volatile DWORD eventNumber;
+    volatile BOOL isInDoDragDropLoop;
 private:
     HWND CreateToolkitWnd(LPCTSTR name);
 
     BOOL m_localPump;
     DWORD m_mainThreadId;