@synchronized vs. NSLock Instance vs. pthread_mutex_t [英] @synchronized vs. NSLock Instance vs. pthread_mutex_t

问题描述

我在观看多线程教学视频（2岁），表示

I was watching a (2-year old) tutorial video on multithreading that stated that

• NSLock实例 @synchronized


• pthread_mutex_t 比使用 NSLock实例快两倍比 @synchronized 快6倍）

• NSLock instance is 3x faster than using @synchronized
• pthread_mutex_t is 2x faster than an NSLock instance (effectively 6x faster than @synchronized)

这是真的吗？我没有找到任何有权威的声明，但是我只是想在StackOverflow为你的意见和可能的坚实证明来轮询你一些。

Is this true? I haven't found anything that states with authority that it is, but I just wanted to poll some of you over at StackOverflow for your opinion and maybe solid proof.

谢谢！

虽然我已经接受了正确答案，但此问题的未来查看者会发现此文章有帮助： http://perpendiculo.us/?p=133

While I've already accepted the correct answer, future viewers of this question will find this article to be helpful: http://perpendiculo.us/?p=133

推荐答案

重要的是要记住， @synchronized 包括必要的try / catch逻辑来释放异常中的锁。一旦你添加了这个逻辑，性能差异（在整体量级上不是很大）可能会明显减少。

It's important to keep in mind that @synchronized includes the necessary try/catch logic to release the lock in an exception. Once you add that logic the performance difference (which is not great in overall magnitude) will probably diminish significantly.

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