public static void addPumpMessage(Display dpy, Runnable pumpMessage) { if (useMainThread) { return; // error ? } if (null == pumpMessagesTimer) { synchronized (MainThread.class) { if (null == pumpMessagesTimer) { pumpMessagesTimer = new Timer(); pumpMessagesTimerTask = new TimerTask() { public void run() { synchronized (pumpMessageDisplayMap) { for (Iterator i = pumpMessageDisplayMap.values().iterator(); i.hasNext(); ) { ((Runnable) i.next()).run(); } } } }; pumpMessagesTimer.scheduleAtFixedRate( pumpMessagesTimerTask, 0, defaultEDTPollGranularity); } } } synchronized (pumpMessageDisplayMap) { pumpMessageDisplayMap.put(dpy, pumpMessage); } }