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Java多线程同步锁、Lock锁和等待唤醒机制及代码演示

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解密Java多线程中的锁机制：CAS与Synchronized的工作原理及优化策略

CAS什么是CASCAS: 全称Compare and swap，字面意思:”比较并交换“，CAS涉及如下操作：假设内存中的原数据为A，旧的预期值为B ，需要修改的值为C。首先把A与B进行比较，看A与B是否相同。如果A与B相同，则把数据C的值赋予A。返回操作成功。我们来写一个CAS的伪代码以帮忙我们...

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java多线程常见锁策略CAS机制（2）

synchronized原理我们总结上面的锁策略,就可以总结出synchronized的一些特性(JDK1.8版本)自适应锁,根据锁竞争激烈程度,开始是乐观锁竞争加剧就变成悲观锁开始是轻量级锁,如果锁冲突加剧,那就变成重量级锁实现轻量级锁是采用自旋锁策略,重量级锁采用挂起等待锁策略是普通的互斥锁可重...

java多线程常见锁策略CAS机制（1）

本节要点了解常见锁策略了解synchronized使用的锁策略理解CAS实现逻辑了解CAS出现的ABA问题,并解决synchronized锁的原理常见锁策略我们已经知道锁在我们的并发编程十分重要.那我们就需要了解,这些锁实现的策略!都有那些策略,便于我们更加深刻的理解锁!下面介绍的几组锁策略,每一组...

java多线程 -- ConcurrentHashMap 锁分段机制

hashtable效率低ConcurrentHashMap 线程安全，效率高 Java 5.0 在 java.util.concurrent 包中提供了多种并发容器类来改进同步容器的性能。 ConcurrentHashMap 同步容器类是Java 5 增加的一个线程安全的哈希表。对与多线程的操作...

java多线程之：深入JVM锁机制2-Lock （转载）

前文（深入JVM锁机制-synchronized）分析了JVM中的synchronized实现，本文继续分析JVM中的另一种锁Lock的实现。与synchronized不同的是，Lock完全用Java写成，在java这个层面是无关JVM实现的。在 java.util.concurrent.lock...

JAVA多线程的锁机制

java的锁机制现行的有synchronized和Lock。 synrhronized关键字简洁、清晰、语义明确。其应用层的语义是可以把任何一个非null对象作为”锁”，当synchronized作用在方法上时，锁住的便是对象实例（this）；当作用在静态方法时...

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