why is wait() called for loop in Thread.join() of Java?

» java » why is wait() called for loop in Thread.join() of Java?

By : Sophia He

Date : November 25 2020, 07:06 PM

Hope that helps t.join() must not return until the thread has terminated. But just because the wait() call returns, that does not mean that the thread is terminated. The method keeps looping until isAlive() returns false.
NOTE: One reason why wait() could return while the thread still is alive is, nothing in the design of the Thread class prevents the caller from waiting on, and notifying a Thread instance for other purposes.

code :

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who and when notify the thread.wait() when thread.join() is called?

By : phong nguyen

Date : March 29 2020, 07:55 AM

I hope this helps . Edit:
Oh, you are talking about inside of the Thread object itself. Inside of join() we do see a wait(). Something like:

code :

while (isAlive()) {
    wait(0);
}

Thread thread = new Thread(new Runnable() {
   public void run() {
      // no-op, just return immediately
   }
});
thread.start();
thread.join();

Using join() vs. wait() thread java

By : Lybezz Okampo

Date : March 29 2020, 07:55 AM

I hope this helps you . Since you are waiting for the 'other' thread to complete (i.e. finish execution), join() would be the better choice.
The javadoc for join() says simply: Waits for this thread to die.

code :

        @Override
        public void run() {
            System.out.println("Hello I'm thread " + getName());
            if (otherThread != null) {
                while (otherThread.isAlive()) {
                    try {
                        otherThread.join();
                    } catch (InterruptedException e) {
                        // ignore
                    }
                }
            }
            System.out.println("I'm finished " + getName());
        }

Java join doesn't wait for thread exit

By : Snorre

Date : March 29 2020, 07:55 AM

help you fix your problem t.join(); in this case waits for run in Giocoto terminate. That method terminates after

code :

f.setVisible(true);
timer.start();

private final CountDownLatch doneSignal = new CountDownLatch(1);

@Override
public void run() 
{
    f.setVisible(true);
    timer.start();
    try {
        doneSignal.await();
    } catch (InterruptedException ex) {}//Logg this or something. Shouldn't really ever happen. 

}

Why doesn't Java's Thread.join() wait for all threads to die in this code?

By : sanditon

Date : March 29 2020, 07:55 AM

help you fix your problem The error was as Solomon Slow pointed out, I was creating a new thread then forgetting about it. That error was introduced when attempting to solve an unrelated issue was was left in. The code below gives me the same result (expected) as Count Down Latch.

code :

    for (UserThread thread : threadArray)
    {
        thread = new UserThread();
        thread.start();
    }

    for (UserThread thread : threadArray)
    {
        if (thread != null)
            thread.join();
    }

Java Thread interrupt only wait, join and sleep

By : aking43

Date : March 29 2020, 07:55 AM

I wish this help you If what you want is that to interrupt the thread only if it is block by wait, join and sleep calls and not on IO operations, you can simply check for the thread state before calling interrupt method. You can refer to the api and different states in the link follows.
https://docs.oracle.com/javase/10/docs/api/java/lang/Thread.State.html

code :

while ( ( thread1.getState() == Thread.State.WAITING || thread1.getState() == Thread.State.TIMED_WAITING ) && !thread1Done.get()) {
    thread1.interrupt();
}