Atomically conditionally sets the tag value for this task.
Among other applications, tags can be used as visit markers
in tasks operating on graphs, as in methods that check: {@code
if (task.compareAndSetForkJoinTaskTag((short)0, (short)1))}
before processing, otherwise exiting because the node has
already been visited.
@param expect the expected tag value
@param update the new tag value
@return {@code true} if successful; i.e., the current value was
equal to {@code expect} and was changed to {@code update}.
@since 1.8
Atomically conditionally sets the tag value for this task. Among other applications, tags can be used as visit markers in tasks operating on graphs, as in methods that check: {@code if (task.compareAndSetForkJoinTaskTag((short)0, (short)1))} before processing, otherwise exiting because the node has already been visited.
@param expect the expected tag value @param update the new tag value @return {@code true} if successful; i.e., the current value was equal to {@code expect} and was changed to {@code update}. @since 1.8