java 信号量简单示例
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Semaphore simple sample
提问by user1074896
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.
任何人都可以分享使用信号量的简单示例吗？如果有可能在没有信号量的情况下解决任务的示例，然后使用信号量来理解它的主要思想。
回答by CloudyMarble
Here is a simple Semaphore implementation:
这是一个简单的信号量实现：
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;
}
}
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.
该take()方法发送一个信号，该信号存储在信号量内部。该release()方法等待信号。当接收到信号标志时再次清除，并release()退出该方法。
Read this articleand take a look at this example
