在多个线程之间共享公共数组

Question

我正在尝试在 Java 中实现 2 阶段资源锁死锁预防算法。经过多次尝试，我决定创建一个 SimpleProcess 类，该类实现将充当我的线程的 Runnable 接口。 SimpleProcess 的结构有点像这样：

public class SimpleProcess implements Runnable
{
    private int pid; // process id
    private ArrayList<Integer> requiredRes; // originally required resources
    private int[] remainingRes; // resources that are still required
    private boolean status; // whether process is completed running or not

    public SimpleProcess() {
        pid = 0;
        status = false;
    }

    public SimpleProcess(int id, ArrayList<Integer> res) {
        pid = id;
        requiredRes = res;
        remainingres = requiredRes;
        status = false;
    }

    public int getPid() {
        return pid;
    }

    public int[] getRequiredRes() {
        return requiredRes;
    }

    public int[] getRemainingRequiredRes() {
        return remainingRes;
    }

    public boolean getStatus() {
        return status;
    }

    public void run() {
        System.out.println("Process " + pid + " started.");
        // do something
        System.out.println("Process " + pid + " is complete.");
    }

}

我的主类将包含一个变量，该变量包含每个资源的锁定状态。这个变量被实现为final Lock[] locked_res = ReentrantLock[nr]。我需要帮助的是找到一种方法来共享这个相同的变量，其值可以由每个线程更改以在所有线程（SimpleProcess 实例）之间共享。

Answer 1

多线程共享可以使用volatile关键字