Java - 如何知道线程何时等待？
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Java - How to know when thread is waiting?
提问by Stefan Hendriks
Is there any neat solution of knowing when a thread has been put into waitstatus? I am putting threads to waitand I notifythem when i need it. But sometimes I want to know if a thread is currently waiting, and if so, I have to do something else.
是否有任何巧妙的解决方案可以知道线程何时被置于wait状态？当我需要它时wait，我将线程放入并放置notify它们。但有时我想知道当前是否有线程正在等待，如果是，我必须做其他事情。
I could probably set a flag myself to true/false. But I can't imagine there is a better way to do this?
我可能可以自己设置一个标志为真/假。但我无法想象有更好的方法来做到这一点？
采纳答案by Alexander Egger
The method getState()of a thread returns a Thread.Statewhich can be:
getState()线程的方法返回 aThread.State可以是：
NEW, RUNNABLE, BLOCKED, WAITING, TIMED_WAITING or TERMINATED
NEW、RUNNABLE、BLOCKED、WAITING、TIMED_WAITING 或 TERMINATED
See Thread.State.
请参阅Thread.State。
回答by Konamiman
Have you looked at Thread.getState?
你看过Thread.getState吗？
回答by JuanZe
回答by Laurent K
You can have all info that you want using the ThreadMXBean.
您可以使用 ThreadMXBean 获得您想要的所有信息。
Try this code:
试试这个代码：
package com.secutix.gui.seatmap;
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
public class ThreadStatus {
private static final ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
public static void main(String[] args) {
for (int i = 0; i < 3; i++) {
buildAndLaunchThread(i);
}
Thread t = new Thread(){
@Override
public void run() {
while(true){
printThreadStatus();
try {
sleep(3000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
};
t.setName("detector");
t.start();
}
protected static void printThreadStatus() {
ThreadInfo[] infos = mbean.dumpAllThreads(true, true);
for (ThreadInfo threadInfo : infos) {
System.out.println(threadInfo.getThreadName() + " state = " + threadInfo.getThreadState());
}
}
private static void buildAndLaunchThread(int i) {
Thread t1 = new Thread(){
@Override
public void run() {
while(true){
try {
sleep(3000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
};
t1.setName("t" + i);
t1.start();
}
}
