Name: akC45999 Date: 06/26/98



The description of java/lang/Thread.join(long millis) reads:

Waits at most millis milliseconds for this thread to die.
    A timeout of 0 means to wait forever.
    Parameters:
       millis - the time to wait in milliseconds.
    Throws:
       InterruptedException - if another thread has
       interrupted the current thread.

So, if the current thread is interrupted, join() has always to throw
InterruptedException.

However, Sun's JDK (all versions including 1.2beta4J)
does not throw InterruptedException if "this" thread has died before the
call to join().

In contrast, sleep(long millis) always throws InterruptedException
even if millis==0.

--------------------------------- interrupt0104.jasm

class interrupt0104 extends Thread {
  Thread mainThread=Thread.currentThread();
  volatile boolean issued=false, mustdie=false;

  public void run() {
mainThread.interrupt();
issued=true;
while (!mustdie) Thread.yield();
  }

  public void waitIssued() {
while (!issued) Thread.yield();
  }

  public void kill() {
mustdie=true;
while (isAlive()) Thread.yield();
  }

  static final int DELAY=5000; // millis

  public static void test(boolean killBefore) {
System.out.print("killBefore="+killBefore+": ");
interrupt0104 childThread=new interrupt0104();
try {
childThread.start();
childThread.waitIssued();

if (killBefore) childThread.kill();

childThread.join(DELAY);
System.out.println("failed: no InterruptedException");
childThread.kill();
} catch (InterruptedException e) {
System.out.println("passed");
childThread.kill();
}
  }

  public static void main(String args[]) {
test(false);
test(true);
  }
}


----------------------------------------
Running the test:

novo64% javac interrupt0104.java
novo64% java -verify interrupt0104
killBefore=false: passed
killBefore=true: failed: no InterruptedException
novo64%

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