Question

我必须通过Monitor锁来解决这个问题。我做了一些代码，但我的逻辑需要你的建议。在输出中，例如它似乎只检查1人占用浴室的情况和另一个等待它转（我很抱歉我的英语，我试图尽可能地描述）。这是输出：

Man 0 enters bathroom Man 0 in bathroom Man 0 exits bathroom Man 0 enters bathroom Man 0 in bathroom Man 0 exits bathroom Woman 1 enters bathroom Woman 1 in bathroom Man 2 in waiting------------>>>> Woman 1 exits bathroom Man 2 in bathroom Man 2 exits bathroom Woman 2 enters bathroom Woman 2 in bathroom Woman 2 exits bathroom

这是4个函数的代码。

public void woman_wants_to_enter(int i) throws InterruptedException {

    lock.lock();
    try {

        if (occupiedCount < numberOfToilets) {

            if (menUsingN == 0) {

                if (womenWaitingN == 0) {
                    System.out.println("Woman " + i + " enters bathroom ");
                    womenUsingN++;
                    occupiedCount++;
                } else {
                    while (womenWaitingN != 0) {
                        System.out.println("Woman " + i + " in waiting------------>>>>");
                        womenWaitingN++;
                        womenWaitingQueue.await();
                    }
                }
            } else {
                while (menUsingN != 0) {
                    System.out.println("Woman " + i + " in waiting------------>>>>");
                    womenWaitingN++;
                    womenWaitingQueue.await();
                }
            }

        } else {
            while (occupiedCount == numberOfToilets) {
                System.out.println("Woman " + i + " in waiting------------>>>>");
                womenWaitingN++;
                womenWaitingQueue.await();
            }
        }

    } finally {
        lock.unlock();
    }
}

public void woman_leaves(int i) throws InterruptedException {

    lock.lock();
    try {

        womenUsingN--;
        occupiedCount--;
        System.out.println("Woman " + i + " exits bathroom ");

        if (womenWaitingN > 0) {
            womenWaitingQueue.signal();
            womenUsingN++;
            occupiedCount++;
            womenWaitingN--;
        } else if (menWaitingN > 0 && womenUsingN == 0) {
            menWaitingQueue.signal();
            menUsingN++;
            occupiedCount++;
            menWaitingN--;
        }

    } finally {
        lock.unlock();
    }

}

public void man_wants_to_enter(int i) throws InterruptedException {
    lock.lock();
    try {

        if (occupiedCount < numberOfToilets) {

            if (womenUsingN == 0) {

                if (womenWaitingN > 0) {
                    womenWaitingQueue.signal();
                    womenUsingN++;
                    occupiedCount++;
                    womenWaitingN--;
                } else {
                    menUsingN++;
                    occupiedCount++;
                    System.out.println("Man " + i + " enters bathroom ");
                    menWaitingQueue.signal();
                }
            } else {
                while (womenUsingN != 0) {
                    System.out.println("Man " + i + " in waiting------------>>>>");
                    menWaitingN++;
                    menWaitingQueue.await();
                }
            }

        } else {
            while (occupiedCount == numberOfToilets) {
                System.out.println("Man " + i + " in waiting------------>>>>");
                menWaitingN++;
                menWaitingQueue.await();
            }
        }

    } finally {
        lock.unlock();
    }
}

public void man_leaves(int i) throws InterruptedException {
    lock.lock();
    try {

        menUsingN--;
        occupiedCount--;
        System.out.println("Man " + i + " exits bathroom ");

        if (womenWaitingN > 0 && menUsingN == 0) {
            womenWaitingQueue.signal();
            womenUsingN++;
            occupiedCount++;
            womenWaitingN--;
        } else if (menWaitingN > 0) {
            menWaitingQueue.signal();
            menWaitingN--;
            menUsingN++;
            occupiedCount++;
        }
    } finally {
        lock.unlock();
    }
}

我很感激你的建议 BTW numberOfToilets = 3;

    private Lock lock = new ReentrantLock();
private Condition womenWaitingQueue = lock.newCondition();
private Condition menWaitingQueue = lock.newCondition();

private int womenWaitingN = 0;
private int menWaitingN = 0;
private int womenUsingN = 0;
private int menUsingN = 0;
private int numberOfToilets;
private int occupiedCount;

public BathRoom(int numberOfToilets, int occupiedCount) {
    this.numberOfToilets = numberOfToilets;
    this.occupiedCount = occupiedCount;
}

主要功能

    public static void main(String args[]) {

    Thread[] women = new Thread[3];
    Thread[] men = new Thread[3];
    int numberOfToilets = 3;
    int occupiedCount = 0;
    BathRoom theBathRoom = new BathRoom(numberOfToilets, occupiedCount);

    for (int i = 0; i < 3; i++)
        women[i] = new Thread(new Woman(i, theBathRoom));

    for (int i = 0; i < 3; i++)
        men[i] = new Thread(new Man(i, theBathRoom));

    for (int i = 0; i < 3; i++)
        women[i].start();

    for (int i = 0; i < 3; i++)
        men[i].start();
}

女人班

class Woman implements Runnable {
private int n; /* This identifies the woman. */
private BathRoom theBathRoom;

public Woman(int n, BathRoom b) {
    this.n = n;
    this.theBathRoom = b;
}

public void run() {
    for (int i = 0; i < 3; i++) {
        try {
            Thread.sleep((long) (500 * Math.random()));
        } catch (InterruptedException e) {
        }
        try {
            theBathRoom.woman_wants_to_enter(n);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("Woman " + n + " in bathroom ");
        try {
            Thread.sleep((long) (500 * Math.random()));
        } catch (InterruptedException e) {
        }
        try {
            theBathRoom.woman_leaves(n);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

} 人类

class Man implements Runnable {
private int n; /* this identifies the man */
private BathRoom theBathRoom;

public Man(int n, BathRoom b) {
    this.n = n;
    this.theBathRoom = b;
}

public void run() {
    for (int i = 0; i < 3; i++) {

        try {
            Thread.sleep((long) (500 * Math.random()));
        } catch (InterruptedException e) {
        }

        try {
            theBathRoom.man_wants_to_enter(n);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("Man " + n + " in bathroom ");
        try {
            Thread.sleep((long) (500 * Math.random()));
        } catch (InterruptedException e) {
        }
        try {
            theBathRoom.man_leaves(n);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

}

Answer 1

您的代码显示男性和女性不应同时进入浴室。因此，如果不同性别的人想要进入，那么接缝就能正常工作。如果几个性别相同的人想要进入浴室，请尝试它是否正常工作。

Java中性浴室显示器

1 个答案: