Fix racing condition of PendingPromise queue.
Fix racing condition of PendingPromise queue.

qiuwch/unrealcv,unrealcv/unrealcv,qiuwch/unrealcv,qiuwch/unrealcv,unrealcv/unrealcv,qiuwch/unrealcv,unrealcv/unrealcv,unrealcv/unrealcv,qiuwch/unrealcv,qiuwch/unrealcv,unrealcv/unrealcv