Punto muerto y hambre en Java

Deadlock : Deadlock es una situación en la que dos subprocesos están esperando el uno al otro y la espera nunca termina. Aquí ambos hilos no pueden completar sus tareas.
 

JAVA

// Java program to illustrate Deadlock situation
class DeadlockDemo extends Thread {
    static Thread mainThread;
    public void run()
    {
        System.out.println("Child Thread waiting for" +
                          " main thread completion");
        try {
 
            // Child thread waiting for completion
            // of main thread
            mainThread.join();
        }
        catch (InterruptedException e) {
            System.out.println("Child thread execution" +
                                           " completes");
        }
    }
    public static void main(String[] args)
                   throws InterruptedException
    {
        DeadlockDemo.mainThread = Thread.currentThread();
        DeadlockDemo thread = new DeadlockDemo();
 
        thread.start();
        System.out.println("Main thread waiting for " +
                            "Child thread completion");
 
        // main thread is waiting for the completion
        // of Child thread
        thread.join();
 
        System.out.println("Main thread execution" +
                                      " completes");
    }
}

Producción: 
 

Main thread waiting for Child thread completion
Child Thread waiting for main thread completion

Starvation : En Starvation, los hilos también se esperan unos a otros. Pero aquí el tiempo de espera no es infinito después de un intervalo de tiempo, el subproceso en espera siempre obtiene los recursos necesarios para ejecutar el método de ejecución del subproceso().
 

JAVA

// Java program to illustrate Starvation concept
class StarvationDemo extends Thread {
    static int threadcount = 1;
    public void run()
    {
        System.out.println(threadcount + "st Child" +
                            " Thread execution starts");
        System.out.println("Child thread execution completes");
        threadcount++;
    }
    public static void main(String[] args)
               throws InterruptedException
    {
        System.out.println("Main thread execution starts");
 
        // Thread priorities are set in a way that thread5
        // gets least priority.
        StarvationDemo thread1 = new StarvationDemo();
        thread1.setPriority(10);
        StarvationDemo thread2 = new StarvationDemo();
        thread2.setPriority(9);
        StarvationDemo thread3 = new StarvationDemo();
        thread3.setPriority(8);
        StarvationDemo thread4 = new StarvationDemo();
        thread4.setPriority(7);
        StarvationDemo thread5 = new StarvationDemo();
        thread5.setPriority(6);
 
        thread1.start();
        thread2.start();
        thread3.start();
        thread4.start();
 
        // Here thread5 have to wait because of the
        // other thread. But after waiting for some
        // interval, thread5 will get the chance of
        // execution. It is known as Starvation
        thread5.start();
 
        System.out.println("Main thread execution completes");
    }
}

Producción: 
 

Main thread execution starts
1st Child Thread execution starts
Child thread execution completes
2st Child Thread execution starts
Child thread execution completes
3st Child Thread execution starts
Child thread execution completes
4st Child Thread execution starts
Child thread execution completes
Main thread execution completes
5st Child Thread execution starts
Child thread execution completes

Publicación traducida automáticamente

Artículo escrito por Bishal Kumar Dubey y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA

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