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