这是由于在实现 JFS2 时采用了写独占 (write-exclusive) 索引节点锁。这种方式允许多个用户同时读取同一个文件,当多个用户需要读取相同的数据文件时,这能够显著地提高性能。
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Exclusive-Read and Exclusive-Write 不允许同时读和同时写 ; 同时读和同时写
exclusive write mode 排它写入方式
exclusive read exclusive write 互斥读互斥写
exclusive read concurrent write 互斥读同作写
concurrent-read and exclusive-write 同时读但不允许同时写
This is due to the way in which JFS2 is implemented with a write-exclusive inode lock, allowing multiples users to read the same file simultaneously.
这是因为JFS2在实现时使用了写独占(write - exclusive)索引节点锁,允许多个用户同时读取相同的文件。
Some file systems support network clients obtaining an exclusive write lock on a file and remove the lock if the client crashes.
一些文件系统支持网络客户端获取对文件的排它写锁定,以及当客户端死机时移交锁定。
Both use two standard file descriptors on each end of the connection-one exclusive to read and another exclusive to write operations.
它们在连接的两端使用两个标准的文件描述符—一个只执行读操作,另一个只执行写操作。
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