java - ReadWriteLock 与 StampedLock

Question

我一直在使用 ReadWriteLock `s 来实现/维护锁定习语。

自 JDK8 StampedLock已介绍。由于 RWLocks 以其缓慢和糟糕的性能而闻名，StampedLock 看起来像是一个替代品(它们不可重入，所以快得多)。

然而，除了性能，在我看来，StampedLock 的维护和使用要困难得多，也复杂得多 - 例如线程现在可以针对自身死锁 - 因此应采取相应的措施。

与 RWLock 相比，StampedLock 有哪些优势？

Answer 1

这article详细解释差异。

The ReentrantReadWriteLock had a lot of shortcomings: It suffered from starvation. You could not upgrade a read lock into a write lock. There was no support for optimistic reads. Programmers "in the know" mostly avoided using them.

Doug Lea's new Java 8 StampedLock addresses all these shortcomings. With some clever code idioms we can also get better performance.