空闲文件描述符的状态是已知的，因为在状态改变时会通知 poll缓存服务。
The state of idle file descriptors is known since the pollcache service is notified once when it changes.
任何改变文件最近访问时间，都会查看所在目录或子目录的变更，并将结果通知给等待操作返回。
Any change to the last access time of files in the watched directory or subtree causes a change notification wait operation to return.
任何改变文件的创建时间的，都会查看所在目录或子目录的变更，并将结果通知给等待操作返回。
Any change to the creation time of files in the watched directory or subtree causes a change notification wait operation to return.
任何文件名改变都会查看所在目录或子目录的变更，并将结果通知给等待操作返回。
Any file name change in the watched directory or subtree causes a change notification wait operation to return.
可以注册一个通知事件时有一个特定的文件或目录的改变，可如果你需要做监控在更大的规模是最好的方法。
It should be possible to register for a notification event when there is a change on a particular file or directory, which would be the best approach if you needed to do monitoring at a larger scale.
可以注册一个通知事件时有一个特定的文件或目录的改变，可如果你需要做监控在更大的规模是最好的方法。
It should be possible to register for a notification event when there is a change on a particular file or directory, which would be the best approach if you needed to do monitoring at a larger scale.
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