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：
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.
这篇关于@synchronized vs. NSLock Instance vs. pthread_mutex_t的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！