question: static private void checkDeadlines ( final long nowNanos , final PriorityBlockingQueue < QueryDeadline > deadlineQueue ) { synchronized ( deadlineQueue ) { checkHeadOfDeadlineQueue ( nowNanos , deadlineQueue ) ; if ( deadlineQueue . size ( ) > DEADLINE_QUEUE_SCAN_SIZE ) { scanDeadlineQueue ( nowNanos , deadlineQueue ) ; } } }
target:  Scan the priority queue of queries with a specified deadline, halting any queries whose deadline has expired.