Question

17.7: You shall design a binary Semaphore and the method aquire(), describe/show how this method can be implemented (permit is a boolean flag which can be set true/ false).

Answer 1

import java.util.concurrent.Semaphore;

public class BinarySemaphore {

private final Semaphore countingSemaphore;

public BinarySemaphore(boolean available) {

if (available) {

countingSemaphore = new Semaphore(1, true);

} else {

countingSemaphore = new Semaphore(0, true);

}

}

public void acquire() throws InterruptedException {

countingSemaphore.acquire();

}

public synchronized void release() {

if (countingSemaphore.availablePermits() != 1) {

countingSemaphore.release();

}

}

}