While Listing 6 shows push_back using the read-write lock.

清单 6 给出使用读写锁的 push_back 方法。

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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。

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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。

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