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Thread: Suspend - Resume: What is the correct way to do this without deprecated methods?

  1. #1
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    Default Suspend - Resume: What is the correct way to do this without deprecated methods?

    Hello there.

    I had a simple program which used the "suspend" and "resume" methods from Java's Thread class.
    Those two methods are deprecated now because they are deadlock prone.
    I would like to re-write my code to not use those deprecated methods anymore but I am not 100% sure how the ideal implementation would look like.

    I have a very simple test program which shows the behaviour I want to achieve.
    public class ThreadTest {
     
    	private static Thread t1;
     
    	public static void main(String[] args) {
    		t1 = new Thread() {
    			public void run() {
    				threadLoop();
    			}
    		};
    		System.out.println("Start");
    		t1.start();
    	}
     
    	private static void threadLoop() {
    		int i = 0;
    		while (true) {
    			i++;
    			if (i == Integer.MAX_VALUE) {
    				openPopup();
    				i = 0;
    			}
    		}
    	}
     
    	private static void openPopup() {
    		Popup popup = new Popup("ALARM!", 
    				"This is an important error message!", 
    				256, 
    				256);
    		popup.addWindowListener(new WindowListener() {
    			public void windowOpened(WindowEvent arg0) {
    			}
    			public void windowIconified(WindowEvent arg0) {
    			}
    			public void windowDeiconified(WindowEvent arg0) {
    			}
    			public void windowDeactivated(WindowEvent arg0) {
    			}
    			public void windowClosing(WindowEvent arg0) {
    			}
    			public void windowClosed(WindowEvent arg0) {
    				t1.resume();
    			}
    			public void windowActivated(WindowEvent arg0) {
    			}
    		});
    		t1.suspend();
    	}
     
    	private static class Popup extends JFrame {
    		... // this is not important
    	}
    }

    Thank you very much in advance.


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    Default Re: Suspend - Resume: What is the correct way to do this without deprecated methods?

    Your answers are here, near the middle of the page, but the whole page is good reading.

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    Default Re: Suspend - Resume: What is the correct way to do this without deprecated methods?

    Thank you.
    That looks a little bit complicated for this simple functionality. Especially since it is absolutely sure that no deadlock can occur in this particular situation.
    I think I will think about this some more.

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    Default Re: Suspend - Resume: What is the correct way to do this without deprecated methods?

    it's not really that complicated. The thread runs when a sentinel value says "Go" and pauses when it says "Stop." Pretty simple, really.

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    Default Re: Suspend - Resume: What is the correct way to do this without deprecated methods?

    Well, its an additional boolean variable, a loop nested with an if and a synchronized block.
    If you compare this to suspend / resume, its quite a bit more complicated. Bloats the code up and its not too obvious what is happening there if you just glance over it.

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