Node.SIGNAL 这个是什么意思？是后继节点对应的线程需要运行？还是自己这个节点对应的线程等待被唤醒？
学习是最好的投资！
waitStatus value to indicate successor's thread needs unparking후속 노드를 깨워야 합니다
waitStatus value to indicate successor's thread needs unparking
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waitStatus value to indicate successor's thread needs unparking후속 노드를 깨워야 합니다