question: public void countDown ( int count ) { sync . releaseShared ( 1 * ( Math . abs ( count ) ) ) ; }
target:  Decrements the count of the latch, releasing all waiting threads if the count reaches zero. <p> If the current count is greater than zero then it is decremented. If the new count is zero then all waiting threads are re-enabled for thread scheduling purposes. <p> If the current count equals zero then nothing happens.