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Nov 6, 2023
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Update Java 并发.md #8

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Expand Up @@ -334,6 +334,7 @@ future.cancel(true);

Java 提供了两种锁机制来控制多个线程对共享资源的互斥访问，第一个是 JVM 实现的 synchronized，而另一个是 JDK 实现的 ReentrantLock。


### synchronized

**1. 同步一个代码块**
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### 比较
| **比较点** | **synchronized** | **ReentrantLock** |
| ------------------------------------------------------------ | ------------------------------------------------------------ | ---------------------------------------------- |
| **锁的实现** | JVM实现 | JDK实现 |
| **性能** | 新版本Java已优化很多，例如自旋锁等，性能与ReentrantLock大致相同 | 与ReentrantLock大致相同 |
| **等待是否可中断**（当持有锁的线程长期不释放锁的时候，正在等待的线程可以选择放弃等待，改为处理其他事情。） | 不可中断 | 可中断 |
| **公平锁**（指多个线程在等待同一个锁时，必须按照申请锁的时间顺序来依次获得锁） | 非公平 | 默认非公平，但也可以是公平的 |
| **锁绑定多个条件** | | 一个ReentrantLock可以同时绑定多个Condition对象 |



**1. 锁的实现**

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