[英]issue with stopping runnable thread using volatile or atomic boolean
我试图使用volatile变量或atomic变量停止正在运行的线程。 但是我对此有些怀疑。 下面是我尝试的代码。
public class DemoThread {
class DemoRunnable implements Runnable {
private String name;
public volatile boolean isRunning = true;
public DemoRunnable() {
}
public DemoRunnable(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public synchronized boolean isRunning() {
return isRunning;
}
public synchronized void setRunning(boolean isRunning) {
this.isRunning = isRunning;
}
@Override
public void run() {
System.out.println(" runnable ..." + name + " isRunning "
+ isRunning);
while (isRunning) {
int i;
for (i = 0; i < 100; i++) {
System.out.println("--------------------> i " + i
+ " name " + name + " isRunning " + isRunning);
}
// if (i > 0) {
// System.out.println(" volatile not working ");
// throw new RuntimeException("volatile not working " + name);
// }
}
System.out.println(" run method ends ..." + isRunning);
}
}
private void demoStop(int count) {
DemoRunnable runnable1 = new DemoRunnable("" + count);
Thread t1 = new Thread(runnable1);
Thread t2 = new Thread(runnable1);
t1.start();
t2.start();
runnable1.isRunning = false;
// runnable1.setRunning(false);
}
public static void main(String[] args) {
DemoThread demoThread = new DemoThread();
for (int i = 0; i < 200; i++) {
try {
demoThread.demoStop(i);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
有时在执行上面的代码时,有时会执行多次包含while循环的run方法。 一旦将isStopped设置为false,是否可以停止while循环运行?
线程的中断方法不会停止正在运行的方法。
我尝试过对isStop变量使用原子布尔和同步方法,但结果相同。
如果您的可运行检查为isInterrupted,则interrupt()将按预期停止读取。
@Override
public void run() {
while (!Thread.currentThread().isInterrupted()) {
someTask();
// thread can sleep if you like, add this block
try {
Thread.sleep(10);
} catch (InterruptedException e) {
log.warn("Interrupted", e);
break;
}
}
}
您的嵌套循环不会检查原子布尔值,并且自然不会停止。 无论如何,interrupt()比than脚的布尔标志好得多。 有关更多详细信息,请参见ExecutorService和Future。
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