Unfortunately, the read method also blocks until data is available, as does the write method.
不幸的是，read方法也要一直阻塞到数据可用为止，write 方法也一样，。
The method is to read and write path metric according to address status mapping relation.
所述方法根据地址状态映射关系进行路径度量的读出和写入。
The method is to read and write path metric according to address status mapping relation.
所述方法根据地址状态映射关系进行路径度量的读出和写入。
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