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Java显式锁-读写锁

@TOC 一、ReentrantLock 简介 ReentrantLock实现了Lock接口，并提供了和synchronized相同的互斥性和内存可见性以及可重入的加锁语义。和synchronized相比它再处理锁的不可用性上有更高的灵活性。下面摘自JDK11文档： ReentrantLock是一...

java多线程——显式锁 vs 隐式锁

所谓显式锁和隐式锁，主要指的就是 synchronized 关键字和 ReentrantLock 类。下面具体聊一聊二者之间的区别：1 底层不同synchronized 是java中的关键字，是JVM层面的锁。ReentrantLock 是是JDK5以后出现的具体的类。使用lock是调用...

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【大厂Java并发编程面试题解】显式锁(Explicit Locks)（下）

4 性能考虑因素Java5的时候J.U.C的ReentrantLock锁竞争性能非常好，到了Java6使用了改进后的算法来管理内置锁，所以现在差不太多了，只好一点点竞争性能的影响可伸缩性的关键要素：如果有越多的资源被耗费在锁的管理和线程调度上，那么应用程序得到的资源就越少，锁的实现方式越好，将需要越...

【大厂Java并发编程面试题解】显式锁(Explicit Locks)（上）

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...

java多线程中显式锁的轮询检测策略

显式锁简介 java5.0之前，在协调对共享对象的访问时可以使用的机制只有synchronized和volatile，java5.0增加了一种新的机制：ReentrantLock。锁像synchronized同步块一样，是一种线程同步机制，与synchronized不同的是ReentrantLoc...

Java并发编程实战系列13之显式锁 (Explicit Locks)

Java5之前只能用synchronized和volatile，5后Doug Lea加入了ReentrantLock，并不是替代内置锁，而是当内置锁机制不适用时，作为一种可选择的高级功能不适用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面（编程有些局限性）所以提供...

Java高级上锁机制：显式锁 ReentrantLock

Java 5.0 加入了新的上锁工作：ReentrantLock，它和同步(Synchronized)方法的内置锁不同，这是一种显式锁。显式锁作为一种高级的上锁工作，是同步方法的一种补充和扩展，用来实现同步代码块无法完成的功能。 1 Lock和ReentrantLock Lock作为显式锁，其提供...

Java并发显式锁和显式条件队列

一显式锁在类中利用synchronized修饰的方法或者this代码块，均使用的是类的实例锁或者类的锁。这些锁都称为内置锁。可以利用显式锁进行协调对象的访问。即ReentrantLock。这是一种可以提供无条件，可轮询，定时以及可中断的锁获取...

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更新时间 2023-08-24 21:42:52

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