1299      * transient, so a {@code null} result does not necessarily imply

  1299      * transient, so a {@code null} result does not necessarily imply

  1300      * quiescence of the pool.  This method is designed primarily to

  1300      * quiescence of the pool.  This method is designed primarily to

  1301      * support extensions, and is unlikely to be useful otherwise.

  1301      * support extensions, and is unlikely to be useful otherwise.

  1302      *

  1302      *

  1303      * @return a task, or {@code null} if none are available

  1303      * @return a task, or {@code null} if none are available

  1305      */

  1305      */

  1306     protected static ForkJoinTask<?> pollSubmission() {

  1306     protected static ForkJoinTask<?> pollSubmission() {

  1307         Thread t;

  1307         Thread t;

  1308         return ((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) ?

  1308         return ((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) ?

  1309             ((ForkJoinWorkerThread)t).pool.pollSubmission() : null;

  1309             ((ForkJoinWorkerThread)t).pool.pollSubmission() : null;