java 如何检查线程是否正在休眠？
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How to check if a thread is sleeping?
提问by Sameek Mishra
Is there any way to check if a given thread is sleeping?
有没有办法检查给定的线程是否正在休眠？
回答by Joachim Sauer
You can call Thread.getState()on and check if the state is TIMED_WAITING.
您可以致电Thread.getState()并检查状态是否为TIMED_WAITING。
Note, however that TIMED_WAITINGdoesn't necessarily mean that the thread called sleep(), it could also be waiting in a Object.wait(long)call or something similar.
请注意，但这TIMED_WAITING并不一定意味着调用的线程sleep()，它也可能正在等待Object.wait(long)调用或类似的东西。
回答by aioobe
Here is an fairly ugly hack to check if the other thread is sleeping:
这是一个相当丑陋的 hack 来检查另一个线程是否正在休眠：
public static boolean isSleeping(Thread t) {
StackTraceElement[] ste = t.getStackTrace();
if (ste.length == 0)
return false; // thread has terminated!
return ste[0].getClassName().equals("java.lang.Thread")
&& ste[0].getMethodName().equals("sleep");
}
回答by add9
i didn't actually did it , but there's an ThreadMXBean Interfacefor getting thread Info
我实际上并没有这样做，但是有一个用于获取线程信息的 ThreadMXBean 接口
which returns ThreadInfo Class, there you might get something with getWaitedTime method.
它返回ThreadInfo Class，在那里你可能会得到一些 getWaitedTime 方法。
回答by Tunca Ersoy
I am not sure if there is a better way but you could change a variable when a thread goes to sleep and check that variable if the thread is sleeping or not.
我不确定是否有更好的方法，但是您可以在线程进入睡眠状态时更改变量，并检查该线程是否处于睡眠状态。
回答by Winfred
You could create your own sleepmethod which records the Thread's IDto a global variableand use it as reference for sleeping thread.
您可以创建自己的sleep方法，该方法将线程的 ID记录到全局变量中，并将其用作睡眠线程的参考。
There's no other way you can tell if a thread is precisely sleeping.
没有其他方法可以判断线程是否正好处于休眠状态。
Hope the three linksbelow help:
希望以下三个链接有帮助：
