Java线程: Is using interrupt() within run() acceptable to stop a thread when it is finished completing its task?

Question

我已经设置了一个 Java Thread 类，它执行创建新的 Process 并将其与各种其他事物一起运行的特定任务。

在调用Thread的父类中，我设置了一个循环

while(!thread.isActive()) {
...
}

我想知道更新Thread类中的run()以发出interrupt()是否是最佳实践/可接受的>

run() {
  callTask();
  interrupt();
}

更新

然后，我可以在 Thread 上创建一个 boolean finished 字段，并在 callTask​​() 完成后将其更改为 true 并获得家长寻找

主题:

run() {
  callTask();
  finished = true;
}

父级:

  // Start the threads for each Device
        for (DeviceRunner deviceRunner : deviceRunners) {
            deviceRunner.start();
        }

        boolean doneProcessingDevices = false;
        while (!doneProcessingDevices) {
            Set<DeviceRunner> deviceRunnersToRemove = new HashSet<DeviceRunner>();
            for (DeviceRunner deviceRunner : deviceRunners) {
                if (deviceRunner.isFinishedRunning()) {  // check to see if the thread is finished
                    deviceRunnersToRemove.add(deviceRunner);
                }
            }

            // remove the device runners which are no longer active
            deviceRunners.removeAll(deviceRunnersToRemove);

            if (deviceRunners.isEmpty()) {
                doneProcessingDevices = true;
            }

            Thread.sleep(1000);
        }

谢谢

Answer 1

只是为了澄清:您不必手动停止线程。当 run() 完成时， native 线程将终止，并且 Thread 对象将被垃圾回收。

如果您希望 parent 等待所有任务完成，您可以使用 CountDownLatch 。使用必须完成的任务数初始化锁存器。每次任务完成时，让他调用 countDown()。与此同时，你的父进程会阻塞 await():

Causes the current thread to wait until the latch has counted down to zero, unless the thread is interrupted.

此 MWE 演示了基本思想:

int numberOfTasks = 3;
CountDownLatch latch = new CountDownLatch(numberOfTasks);

while (numberOfTasks-- > 0) {
    new Thread(() -> {
        try {
            // Do stuff.
            System.out.println("Done.");
        } finally {
            latch.countDown();
        }
    }).start();
}

try {
    latch.await();
    System.out.println("All tasks finished.");
} catch (InterruptedException e) { /* NOP */ }

在每个任务打印 Done. 之前，您不会看到 Alltasksished.。