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Java5之前只能用synchronized和volatile，Java5后Doug Lea提供了ReentrantLock，并非为了替代内置锁，而是当内置锁的机制不适用时，作为一种可选择的高级功能。内置锁不适用的场景包括：无法中断一个正在等待获取锁的线程无限的锁等待内置锁必须放在代码块里（编程有些...

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【漫画】JAVA并发编程 J.U.C Lock包之ReentrantLock互斥锁

原创声明：本文来源于公众号【胖滚猪学编程】转载请注明出处在JAVA并发编程如何解决原子性问题的最后，我们卖了个关子，互斥锁不仅仅只有synchronized关键字，还可以用J.U.C中的Locks的包来实现，并且它非常强大！今天就来一探究竟吧！ ReentrantLock 顾名思义，Reen...

Java并发编程笔记之StampedLock锁源码探究

StampedLock是JUC并发包里面JDK1.8版本新增的一个锁，该锁提供了三种模式的读写控制，当调用获取锁的系列函数的时候，会返回一个long 型的变量，该变量被称为戳记（stamp),这个戳记代表了锁的状态。 try系列获取锁的函数，当获取锁失败后会返回为0的stamp值。当调用释放锁和转换...

Java并发编程笔记之读写锁 ReentrantReadWriteLock 源码分析

我们知道在解决线程安全问题上使用 ReentrantLock 就可以，但是 ReentrantLock 是独占锁，同时只有一个线程可以获取该锁，而实际情况下会有写少读多的场景，显然 ReentrantLock 满足不了需求，所以 ReentrantReadWriteLock 应运而生，Reentra...

Java并发编程 -- AQS入门&实现可重入锁

Java并发编程 -- AQS可能会看的一脸懵逼，今天实战一个项目练手AQS MyAQSLock.java /** * Created by Fant.J. */ public class MyAQSLock implements Lock { private Helper helper = new...

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章节目录 ReentrantReadWriteLock 特性读写锁接口示例读写锁的实现分析读写状态设计写锁的释放与获取读锁的释放与获取锁降级 1. ReentrantReadWriteLock 特性 1.1 读写锁定义读写锁维护了一对锁，一个读锁，一个写锁，通过分离读锁写锁，使得并发性...

Java并发编程-重入锁

章节目录什么是重入锁底层实现-如何实现重入公平与非公平获取锁的区别与底层实现 1.什么是重入锁 1.1 重入锁的定义重入锁ReentrantLock，支持重入的锁，表示一个线程对资源的重复加锁。 1.2 重入锁的特性 1.重进入 2.非/公平性获取锁 1.3 自定义同步器Mutex 的缺陷 ...

Java并发编程-各种锁

安全性和活跃度通常相互牵制。我们使用锁来保证线程安全，但是滥用锁可能引起锁顺序死锁。类似地，我们使用线程池和信号量来约束资源的使用，但是缺不能知晓哪些管辖范围内的活动可能形成的资源死锁。Java应用程序不能从死锁中恢复，所以确保你的设计能够避免死锁出现的先决条件是非常有价值。一.死锁经典的“哲...

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