清单1显示了如何使用锁定(同步)实现该类的例子。

Listing 1 shows an example of how this class might be implemented using locks (synchronization).

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如果同步时还发生锁定争用，那么性能上付出的代价会大得多，因为会需要几个线程切换和系统调用。

If the synchronization actually requires contending for the lock, the performance penalty is substantially greater, as there will be several thread switches and system calls required.

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因此不需要实现复杂的锁定及同步算法。

Thus, there is no need to implement complicated locking and synchronization algorithms.

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