What is the purpose of the CountDownLatch class in Java threads? Question 3Answera.It Delays the execution of a thread.b.It Counts the number of active threads in the program.c.It synchronizes the execution of multiple threads till the operations are complete.d.Allows one or more threads to wait for a set of operations to complete.
Question
What is the purpose of the CountDownLatch class in Java threads? Question 3Answera.It Delays the execution of a thread.b.It Counts the number of active threads in the program.c.It synchronizes the execution of multiple threads till the operations are complete.d.Allows one or more threads to wait for a set of operations to complete.
Solution
The purpose of the CountDownLatch class in Java threads is to synchronize the execution of multiple threads until the operations are complete. This means that it allows one or more threads to wait until a set of operations to complete. It's a synchronization aid that allows one or more threads to wait until a set of operations being performed in other threads completes.
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Se quiere implementar un monitor Java que proporcione la funcionalidad básica del CountDownLatch, con los métodos countDown y await.public class MiCountDownLatch { private int n; public MiCountDownLatch(int n0) { n=n0; } public synchronized void countDown() { n--; notifyAll(); } public void await() throws InterruptedException { while (n > 0) wait(); }}Preguntas 14 de 20 0,5 Puntos. Puntos descontados por fallo: 0.25Esta solución no es correcta porque se pueden producir condiciones de carrera.VerdaderoFalsoBorra selecciónPreguntas 15 de 20 0,5 Puntos. Puntos descontados por fallo: 0.25Con esta solución, como el valor del contador de la barrera podría ser negativo, se podrían quedar hilos suspendidos al hacer await sobre la barrera, aunque la barrera esté ya abierta.VerdaderoFalsoBorra selecciónPreguntas 16 de 20 0,5 Puntos. Puntos descontados por fallo: 0.25Para que esta solución sea correcta hay que sustituir en el método countDown la línea actual de notifyAll() por signalAll().VerdaderoFalso
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