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I used the following code to check if Thread of java process can have independent state
// I used the following code to check if Thread of java process can have independent state with
// ps -Teo state,pcpu,pmem,nlwp,pid,spid,user,args |grep FakeThread
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
// The goal is to create several Thread that should be in different state and check if ps or other catch the correct state of the thread
public class FakeThreadState {
/**
* @param args
*/
public static void main(String[] args) {
Thread waitingRunnable = new Thread(){
@Override
public void run() {
try {
Object lock = new Object();
synchronized(lock) {
lock.wait();
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
};
};
};
Thread sleepingRunnable = new Thread(){
@Override
public void run() {
try {
sleep(60*60*1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} //1H
};
};
Thread summingRunnable = new Thread(){
@Override
public void run() {
long l = 0;
long op = +1;
while(true) {
l = l + op;
if (l == 1000) {
op = -1;
} else if (l == 0) {
op = +1;
}
}
};
};
Thread ioRunnable = new Thread(){
@Override
public void run() {
try {
File f = new File("/tmp/z");
f.deleteOnExit();
FileOutputStream os = null;
try {
long i = 0;
while(true) {
if (i % 1000 == 0) {
if (os != null) os.close();
os = new FileOutputStream(f);
}
if (os != null) {
os.write(33);
os.flush();
}
i++;
}
} finally {
if (os != null) os.close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
};
};
waitingRunnable.start();
sleepingRunnable.start();
summingRunnable.start();
ioRunnable.start();
}
}
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