Run the following programs.
Sometimes parent process(thread) does not die automatically.
When THREADS_FLAG is set to "native", thread dies automatically.
But if this environment variable has not been set or set to "green",
thread does not die automatically.
- compile ArgPass.java
- compile Hello.java
- run this program as follows:
java ArgPass java Hello

programs:
--------------------
import java.io.*;

public class ArgPass implements Runnable {
  InputStream is;
  OutputStream os;

  public static void main(String args[]) throws InterruptedException, IOException {
    Process ps = Runtime.getRuntime().exec(args);


    Thread tout = new Thread(new ArgPass(ps.getInputStream(), System.out));
    Thread terr = new Thread(new ArgPass(ps.getErrorStream(), System.err));
    tout.start();
    terr.start();
    tout.join();
    terr.join();

  }

  ArgPass(InputStream is, OutputStream os) {
    this.is = is;
    this.os = os;
  }

  public void run() {
    try {
      int ch;

      while((ch = is.read()) != -1)
        os.write(ch);
    } catch(IOException e) {
    }
  }
}
--------------------
public class Hello {
public static void main(String args[]) {
System.out.println("Hello World");
}
}
--------------------