presto-main/src/main/java/io/prestosql/operator/DriverContext.java/DriverContext/run
class DriverContext:        @Override
        public void run()
        {
            synchronized (this) {
                if (finished) {
                    return;
                }
                finished = true;
                blockedMonitor.compareAndSet(this, null);
                blockedWallNanos.getAndAdd(getBlockedTime());
            }
        }