How organaize out in MT programms?

Hello, I started to learn some multi-threaded programms and Atomic variables. But a question about the simple example.
public class Main {
    
    /** Creates a new instance of Main */
    public Main() {
    }

    public static void main(String[] args) {
        new TestThread("T1");
        new TestThread("T2");
        new TestThread("T3");
        new TestThread("T4");
        new TestThread("T5");
        new TestThread("T6");
        new TestThread("T7");
        new TestThread("T8");
        new TestThread("T9");  
        new TestThread("T10");
        new TestThread("T12");
        new TestThread("T13");
        new TestThread("T14");
        new TestThread("T15");
        new TestThread("T16");       
        new TestThread("T17");
        new TestThread("T18");
        new TestThread("T19");
        new TestThread("T20");
        new TestThread("T21");
        new TestThread("T22");


    }
    
}

public class TestThread implements Runnable{
    
    private Thread t;
    
    /** Creates a new instance of TestThread */
    public TestThread(String name) {
        t = new Thread(this, name);
        System.out.println("Thread " + t.getName() + ": is created.");
        t.start();
    }
    
    public void run() {
        ProgGenerator pg = ProgGenerator.getInstance();
        for (int i = 0; i < 2; i ++) {
            int k = pg.next();
            synchronized (System.class) {
                System.out.println("Thread " + t.getName() + ": " + k);
            }

        }
    } 
}

public class ProgGenerator {
    
    private static ProgGenerator instance = new ProgGenerator();
    private AtomicInteger currentInt;
    
    /** Creates a new instance of ProgGenerator */
    private ProgGenerator() {
        currentInt = new AtomicInteger(1);
    }
    
    public static ProgGenerator getInstance() {
        return instance;
    }
    
    public int next() {
        int result;
        do{
            result = currentInt.get();
        }while(!currentInt.compareAndSet(result, result + 2));
        return result + 2;
    }
}
When I run it I have something like this:
Thread T1: is created.
Thread T2: is created.
Thread T3: is created.
Thread T4: is created.
Thread T5: is created.
Thread T6: is created.
Thread T7: is created.
Thread T8: is created.
Thread T9: is created.
Thread T10: is created.
Thread T12: is created.
Thread T13: is created.
Thread T14: is created.
Thread T15: is created.
Thread T16: is created.
Thread T17: is created.
Thread T18: is created.
Thread T19: is created.
Thread T20: is created.
Thread T21: is created.
Thread T22: is created.
Thread T1: 3
Thread T1: 43
Thread T2: 5
Thread T2: 45
Thread T21: 41
Thread T21: 47
Thread T20: 39
Thread T20: 49
Thread T19: 37
Thread T19: 51
Thread T18: 35
Thread T18: 53
Thread T17: 33
Thread T17: 55
Thread T16: 31
Thread T16: 57
Thread T15: 29
Thread T15: 59
Thread T14: 27
Thread T14: 61
Thread T13: 25
Thread T13: 63
Thread T12: 23
Thread T12: 65
Thread T10: 21
Thread T10: 67
Thread T9: 19
Thread T9: 69
Thread T8: 17
Thread T8: 71
Thread T7: 15
Thread T7: 73
Thread T6: 13
Thread T6: 75
Thread T5: 11
Thread T5: 77
Thread T4: 9
Thread T4: 79
Thread T3: 7
Thread T3: 81
Thread T22: 83
Thread T22: 85
So, as you can see he is not out in order of numbering of the threads (thread number 22 is near the number 3 of the thread, but it's ok). And of course it is there no error, but I cann't find reseans why the values in this son are mixed? I try to explain what I mean. We get this:
Thread T1: 3
Thread T1: 43
Thread T2: 5
Thread T2: 45
Thread T21: 41
Thread T21: 47
But not for example:
Thread T1: 3
Thread T1: 5
Thread T2: 7
Thread T2: 9
Thread T21: 11
Thread T21: 13
I can only afford, this thread can be stopped between updating the value and display it. This thread 1 first time set 3 and exit it, but then all variable son increased thread 41 but not make the exit, then walk again enter the loop value 43 and exit at the same time. If so, it's something strange that about 20 threads display nothing until the thread 1 output.
Is there a mistake? Or just everything is ok? And this code works correctly in multi-threaded program if we speak out (I mean that the update of currentInt is safe when you work with threads and each of them get good value when access)?

Published by: sphinks 16 January 2011 13:45

Published by: sphinks 16 January 2011 13:55

Hi Sphinks,

If you have needs on order of execution of the code running in java different Threads, you must take care through the synchronization of this order yourself. Without making an attempt to describe what is happening inside your computer while your program is running, the output is to be expected and your description of the reason lies in a sort of handwaving.

I like to think, however, that you can write an example program slightly less complicated which shows the AtomicInteger to work in a multi thread environment. How about having your Runnables does not print but store the values and have your main thread loop on them after they are all made to print "results"?

Thank you p.s. use [code] - labels in the future.

Tags: Java

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