volatile java语言 volatile：Java并发中的定海神针，轻量级却直击痛点

发布时间：2026/7/23 0:38:43

volatile java语言 volatile：Java并发中的定海神针，轻量级却直击痛点 于其中, 那双重检查锁运用到了关键字, 此篇文章会引领大家深入去了解一下相关方面的知识。简介它是由Java所供应的一种具备轻量级特点的同步机制, 于并发编程范畴里起着相对比较重要的作用。相较于别的, 它具有更为轻量级的特性。示例说明首先我们先来看一段代码package com.secbro2.others.testVolatile; /** * author zzs */ public class TestVolatile { private static boolean status false; public static void main(String[] args) throws InterruptedException { new Thread(() - { while (!status) { } }).start(); Thread.sleep(100L); status true; System.out.println(status is status); } }一个实体类, 它含有一个属性, 该属性的默认值是false, 在main方法里启动一个线程, 在线程里头当属性变为true时就停止, 当属性为false时就持续执行, 接着线程睡眠100毫秒, 随后把属性改为true, 并且打印修改之后的状况, 那么, 线程里的while方法在这个时候会不会也跟着结束掉呢? 答案是不会的当运行此端代码之际, 我们能够发觉, 尽管已然打印出“ is true”, 可是线程并未终止, 始终在运行。这究竟是因何缘故呢?内存可见性若处于单线程里, 上述所举的例子, 那儿的业务逻辑必然会与我们预先期待的结果保持一致。然而在多线程模型下。共享变量于各个线程之际是“无法看见的”。所谓可被视物之特性, 乃有一线程对共享变量作出更改后, 更改之后呈现之值于其他线程而言能够即刻获取, 此即线程相互间之可被视物之特性。上述示例恰因未达成线程相互间之可被视物之特性, 所以于主线程之上更改了值, 然另一个线程却未曾获取到, 故而持续反复执行。Java内存模型Java虚拟机的内存模型, 也就是号称Java Model的JMM, 它能够决定线程针对共享变量所做出的写入动作是否会被其他线程察觉到。JMM对存在于线程以及主线程内存之间的抽象关系予以了定义: 共享变量放置在主内存里, 也就是Man之中, 每一个线程都拥有一个属于自身的私有本地内存, 即Local, 本地内存留存着该线程所用到的主内存的副本拷贝, 线程针对变量展开的所有操作都必须于工作内存内开展, 而绝对不可以径直对主内存的变量进行读写。运用和Lock能够处理线程同步的问题, 只不过面对上面提及的问题运用它们太过重量级了。这时的作用凸显出来了, 在修饰变量之后会有如下作用: - 当对一个变量进行写入操作时, JMM会将该线程相应的本地缓存里面的变量强行刷新到主内存当中去 - 写操作会致使其他线程里的缓存变为无效。修改过后的变量为package com.secbro2.others.testVolatile; /** * author zzs */ public class TestVolatile { private static volatile boolean status false; public static void main(String[] args) throws InterruptedException { new Thread(() - { while (!status) { } }).start(); Thread.sleep(100L); status true; System.out.println(status is status); } }此时再执行程序会发现当被修改之后程序马上停止了。是否能够保持原子性多线程的另外一个问题, 是原子性操作, 当一个操作并非原子性的时候, 那么要是多线程同时去操作, 就极有可能会引发并发问题。首先, 来看一个示例。package com.secbro2.others.testVolatile; /** * author zzs */ public class Counter { private volatile int inc 0; private void increase() { inc; } public static void main(String[] args) throws InterruptedException { Counter counter new Counter(); for (int i 0; i 10; i) { new Thread(() - { for (int j 0; j 1000; j) { counter.increase(); } }).start(); } Thread.sleep(3000L); System.out.println(counter.inc); } }执行结果为6847执行结果并非预期之中的10000 , 这也就表明, 虽说能够确保可见性, 然而却无法确保原子性。可见性是能够得到保证的, 每个线程每一次读取到的值均为最新值, 可是读取之后再进行操作就难以保证了。就比如说上面所举的例子, inc的自身递增操作涵盖了三步: 读取inc的值, 实施加1操作, 写入工作内存, 这也就意味着inc的自增操作并不是原子性的。对上面的代码进行修改使用关键字即可保证线程的安全package com.secbro2.others.testVolatile; /** * author zzs */ public class Counter { private volatile int inc 0; private synchronized void increase() { inc; } public static void main(String[] args) throws InterruptedException { Counter counter new Counter(); for (int i 0; i 10; i) { new Thread(() - { for (int j 0; j 1000; j) { counter.increase(); } }).start(); } Thread.sleep(3000L); System.out.println(counter.inc); } }输出的结果为何是预期之中的10000 , 当然了, 可以用来保障递增的原子性, 此处不再进行关于此的举例说明。是否可以保证有序性处理器为了提升程序运行效率, 或许会对输入代码予以优化, 它并不确保程序里边各个语句的执行前后顺序跟代码中的顺序相同, 然而它会确保程序最终的执行结果和代码依序执行的结果是一样的int a 10; //语句1 int r 2; //语句2 a a 3; //语句3 r a*a; //语句4比如说像上面所提到的代码, 其所具备的可以出现的执行顺序是这样的: 先是语句2, 接着是语句1, 然后是语句3, 随后是语句4, 然而绝对不会呈现为这样的顺序先是语句2, 接着是语句1, 之后是语句4, 再之后是语句3。关键字还能禁止指令的重排序所以能在一定程序上保证有序性。关键字禁止指令重排序有两层意思具体示例在将单例模式的双重检查锁中已经讲到实现代码如下:package com.secbro2.gof23.singleton; /** * Singleton Patterns ** Double checked lock and volatile; * * author zzs */ public class SingletonThreadSafe2 { private static volatile SingletonThreadSafe2 instance; private SingletonThreadSafe2() {} public static SingletonThreadSafe2 getInstance() { if (instance null) { synchronized (SingletonThreadSafe2.class) { if (instance null) { instance new SingletonThreadSafe2(); } } } return instance; } public void helloSingleton() { System.out.println(Hello SingletonThreadSafe1!); } }小结通过上面所进行的那番讲解, 我们所知悉地了解着的基本作用以及示例, 它的应用方面的场景诸如状态标记量还有双重检查。然而我们得要清楚明白的是, 其能够解决一部分线程并发的相关问题, 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