The capital W in the FD column indicates that the application has a write lock on the whole file.
FD列中的大写W表示该应用程序具有对整个文件的写锁。
Locking occurs on two levels (see Listing 7) : The list has a read-write lock, while individual nodes contain a mutex.
在两个级别上执行锁定(见清单7)：链表有一个读写锁，各个节点包含一个互斥锁。
The reason this technique is called the "cheap read-write lock" is that you are using different synchronization mechanisms for reads and writes.
之所以将这种技术称之为 “开销较低的读-写锁” 是因为您使用了不同的同步机制进行读写操作。
If you don't adhere to this approach in prioritizing writer threads using pthread_setschedprio, then given the nature of read-write lock, it is easy to see how writer threads could starve.
如果不按这种方式使用 pthread_setschedprio 设置写线程的优先级，根据读写锁的性质，很容易看出写线程可能会饿死。
Exclusive lock - is a write lock that prevents data from being changed while a user is already modifying it.
独占式加锁—是一种写加锁，防止数据在有用户已经在修改它时被修改。
For example, if you have six databases and one takes a write lock, the other five are still available for read and write.
例如，如果你有六个数据库，其中一个有写锁，其他的五个仍然可以进行读写。
For example, if you have six databases and one takes a write lock, the other five are still available for read and write.
例如，如果你有六个数据库，其中一个有写锁，其他的五个仍然可以进行读写。
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