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Java多线程进一步的理解------------实现读写锁

public class ReadAndWriteLock { public static void main(String[] args) { final QueueJ q = new QueueJ(); for (int i = 0; i <3 ; i++) { new Thread(){...

Java多线程 -- 互斥锁/共享锁/读写锁快速入门

什么是互斥锁? 在访问共享资源之前对进行加锁操作，在访问完成之后进行解锁操作。加锁后，任何其他试图再次加锁的线程会被阻塞，直到当前进程解锁。如果解锁时有一个以上的线程阻塞，那么所有该锁上的线程都被编程就绪状态，第一个变为就绪状态的线程又执行加锁操作，那么其他的线程又会进入等待。在这种方式下，...

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java多线程 -- ReadWriteLock 读写锁

写一条线程，读多条线程能够提升效率。写写/读写需要“互斥”;读读不需要互斥. ReadWriteLock 维护了一对相关的锁，一个用于只读操作，另一个用于写入操作。只要没有 writer，读取锁可以由多个 reader 线程同时保持。写入锁是独占的。 ReadWriteLock 读取操作通常不...

java多线程：并发包中ReentrantReadWriteLock读写锁的锁降级模板

写锁降级为读锁，但读锁不可升级或降级为写锁。锁降级是为了让当前线程感知到数据的变化。 1 //读写锁 2 private ReentrantReadWriteLock lock=new ReentrantReadWriteLock(); 3 //读锁 4 private ReadLock read...

java多线程：并发包中ReentrantReadWriteLock读写锁的原理

一：读写锁解决的场景问题--->数据的读取频率远远大于写的频率的场景，就可以使用读写锁。二：读写锁的结构--->用state一个变量。将其转化成二进制，前16位为高位，标记读线程获取锁的次数。后16位为低位，标记写线程获取锁的次数。--->读写锁需要解决的冲突：读/写冲突，写/写冲...

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