Move to main thread after another thread go to sleep

» java » Move to main thread after another thread go to sleep

By : Abhishek Kumar

Date : December 01 2020, 04:50 PM

it should still fix some issue What you have done in your code above created a thread that runs concurrently with the main thread. What actually happens is:
Main thread starts and initiates AutoUpdater thread The two threads will run concurrently. In fact, the Main thread may even terminate before the AutoUpdater thread has really started. The auto-update thread processes the clients ONCE, then sleeps for 24 hours and then terminates and your program completely terminates at this point.

code :

public class AutoUpdater implements Runnable {
    public void run() {
        while (true) {
            try {
                System.out.println("Thread is running...");
                for (int i = 0; i < clients.size(); i++) {
                    // do something...
                }
            } finally {
                System.out.println("Thread ended.\n");
            }

            int time = 1000 * 60 * 60 * 24;
            try {
                Thread.sleep(time);
            } catch (InterruptedException e) {
                System.out.println("Something interrputed thread while running.");
            }
        }
    }
}

public class AutoUpdater implements Runnable {
    public void run() {
        System.out.println("Thread is running...");
        for (int i = 0; i < clients.size(); i++) {
            // do something...
        }
        System.out.println("Thread ended.\n");
    }
}

public static class Main {
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
        executor.scheduleAtFixedRate(
                    new AutoUpdater(clients, lock.writeLock()),
                    0,
                    24,
                    TimeUnit.HOURS);

        System.out.println("This is a test");
    }
}

Object sharedMonitor = new byte[0]

// In your auto-updater and other threads
synchronised(sharedMonitor ) {

}

public static class Main {
    private static List<String> clients = new ArrayList<>();

    public static void main(String[] args) throws IOException, ClassNotFoundException {
        ReadWriteLock lock = new ReentrantReadWriteLock();

        ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
        executor.scheduleAtFixedRate(
                new AutoUpdater(clients, lock.writeLock()),
                0,
                24,
                TimeUnit.HOURS);

        Lock readLock = lock.readLock();
        while (true) {
            try {
                readLock.lock();
                System.out.println("This is a test");
            } finally {
                readLock.unlock();
            }
        }
    }
}

public class AutoUpdater implements Runnable {
    public void run() {
        try {
            lock.lock();
            System.out.println("Thread is running...");
                // do something...
            }
        } finally {
            System.out.println("Thread ended.\n");
            lock.unlock();
        }
    }
}

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C++ UNIX: Threading: Make Main-Thread wait or sleep until processing is over - main-thread doesnt know pthread_t refrenc

By : user3553036

Date : March 29 2020, 07:55 AM

will help you sc->start_server runs an endless loop in which a MyClass processing method is invoked in a thread. How can i replace the while(true) statement in main so that my program waits for all threads to terminate? , Use join on any thread you want to wait.

sleep() thread is sleeping main thread and not separate specified thread

By : Diego Hernández

Date : March 29 2020, 07:55 AM

I think the issue was by ths following , As i can see you already know Thread.sleep is static method and only sleeps the current thread running there are 2 places where you are using sleep().
BackgroundTestRunnerThread.sleep(sleepTime * 1000); in run() method:This can not be an issue as it will be always called in BackgroundTestRunnerThread thread not in main thread. pause(int milliseconds) method: I can not see your main thread code but chances are you are calling the pause method from main assuming it will sleep the BackgroundTestRunnerThread thread but because it might be getting called from main thread it will make main thread sleep not the other one.

c# Thread.sleep sleep the current thread or the main thread?

By : Large Generators

Date : March 29 2020, 07:55 AM

wish helps you Thread.Sleep() sleeps the current thread. Here is the msdn documentation:
Thread.Sleep

If there's only one thread running(main) and sleep(1000) is invoked, will the thread sleep for exactly 1 second or atlea

By : iansealy

Date : March 29 2020, 07:55 AM

it should still fix some issue Approximately 1-second pause. The thread can be woken up beforehand and you'll get an InterruptedException, or the thread can sleep for 1000ms and then not get to run immediately, so it will be 1000ms + microseconds (or more, if there are higher priority threads hogging the CPU).
You're also calling it wrong. It's Thread.sleep(1000);, as a static method it always acts on the current thread and you can't make other threads sleep with it.