Exclusive-Read and Exclusive-Write 不允许同时读和同时写 ; 同时读和同时写
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
Once an exclusive lock has been issued, no other read or write operations can take place.
在发出独占锁定后，其他的读或写操作将不会再发生。
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。
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。
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