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Java多线程:Semaphore

自从5.0开始，jdk在java.util.concurrent包里提供了Semaphore 的官方实现。Java 5.0里新加了4个协调线程间进程的同步装置，它们分别是： Semaphore, CountDownLatch, CyclicBarrier和Exchanger.Semaphore为并发...

java多线程系列：Semaphore和Exchanger

本篇文章将介绍Semaphore和Exchanger这两个并发工具类。 Semaphore 信号量（英语：Semaphore）又称为信号标，是一个同步对象，用于保持在0至指定最大值之间的一个计数值。当线程完成一次对该semaphore对象的等待（wait）时，该计数值减一；当线程完成一次对semap...

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java多线程之闭锁（CountDownLatch）、同步屏幕（CyclicBarrier）、信号量（Semaphore）

闭锁CountDownLatch 若有多条线程，其中一条线程需要等到其他所有线程准备完所需的资源后才能运行，这样的情况可以使用闭锁。 import java.util.concurrent.CountDownLatch; /** * Created by chenjianan on 2017/1/1...

JAVA多线程--信号量(Semaphore)

简介信号量(Semaphore)，有时被称为信号灯，是在多线程环境下使用的一种设施, 它负责协调各个线程, 以保证它们能够正确、合理的使用公共资源。 &n...

java多线程--信号量Semaphore的使用

　　Semaphore可以控制某个共享资源可被同时访问的次数,即可以维护当前访问某一共享资源的线程个数,并提供了同步机制.例如控制某一个文件允许的并发访问的数量. 　　例如网吧里有100台机器,那么最多只能提供100个人同时上网,当来了第101个客人的时候,就需要等着,一旦有一个人人下机,就可以立马...

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