信号量简单的样本 [英] Semaphore simple sample

问题描述

任何人都可以分享使用信号量的简单示例吗？
如果有可能解决没有信号量的任务，然后用信号量来理解它的主要想法。

Can anyone share simple sample of using Semaphore? If it's possible a sample of solving a task without semaphore and then with semaphore to understand main idea of it.

推荐答案

这是一个简单的信号量实现：

Here is a simple Semaphore implementation:

public class Semaphore {
  private boolean signal = false;

  public synchronized void take() {
    this.signal = true;
    this.notify();
  }

  public synchronized void release() throws InterruptedException{
    while(!this.signal) wait();
    this.signal = false;
  }

}

take（）方法发送一个内部存储在信号量中的信号。 release（）方法等待信号。收到信号标志后再次清除，退出 release（）方法。

The take() method sends a signal which is stored internally in the Semaphore. The release() method waits for a signal. When received the signal flag is cleared again, and the release() method exited.

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