887      * Creates a new {@code secondary loop} associated with this

   888      * event queue. Use the {@link SecondaryLoop#enter} and

   889      * {@link SecondaryLoop#exit} methods to start and stop the

   890      * event loop and dispatch the events from this queue.

   891      *

   892      * @return secondaryLoop A new secondary loop object, which can

   893      *                       be used to launch a new nested event

   894      *                       loop and dispatch events from this queue

   895      *

   896      * @see SecondaryLoop#enter

   897      * @see SecondaryLoop#exit

   898      *

   899      * @since 1.7

   900      */

   901     public SecondaryLoop createSecondaryLoop() {

   902         return createSecondaryLoop(null, null, 0);

   903     }

   904 

   905     SecondaryLoop createSecondaryLoop(Conditional cond, EventFilter filter, long interval) {

   906         pushPopLock.lock();

   907         try {

   908             if (nextQueue != null) {

   909                 // Forward the request to the top of EventQueue stack

   910                 return nextQueue.createSecondaryLoop(cond, filter, interval);

   911             }

   912             if (dispatchThread == null) {

   913                 initDispatchThread();

   914             }

   915             return new WaitDispatchSupport(dispatchThread, cond, filter, interval);

   916         } finally {

   917             pushPopLock.unlock();

   918         }

   919     }

   920 

   921     /**