zhangzhen02的博客

CyclicBarrier同步器经常被问到，跟CountDownLatch有什么区别。区别还是很大的。我们从源码看一下：继承关系及属性public class CyclicBarrier { private static class Generation { boolean broken = false; } private final ReentrantLock lock = new ReentrantLock(); /** Condition to

看几个主要方法abstract static class Sync extends AbstractQueuedSynchronizer { private static final long serialVersionUID = 1192457210091910933L; Sync(int permits) { setState(permits); } final int getPermits() {

首先看内部结构public class CountDownLatch { /** * Synchronization control For CountDownLatch. * Uses AQS state to represent count. */ private static final class Sync extends AbstractQueuedSynchronizer { private static final long se

AQS是什么？AQS（AbstractQueuedSynchronizer）是Java中重要的同步框架。该框架实现了大部分的同步器功能，使使用者仅覆盖几个简单的方法就可以得到各种各样的同步器，包括ReentrantLock,Semaphore,CountDownLatch,ReentrantReadWriteLock,ThreadPoolExecutor等，当然也可以很简单的实现我们自己定义的同步器。从ReentrantLock说起。当我们使用一个ReentrantLock时Lock lock=ne

Atomic类是通过Unsafe类，实现的原子性。而Unsafe类是由native方法实现的。看下源码：public class AtomicInteger extends Number implements java.io.Serializable { public final int getAndIncrement() { return unsafe.getAndAddInt(this, valueOffset, 1); }}Unsafe类public final