Thread.sleep() and lock

[Suleyman Suleymanov]

hello.can anyone help me with this code? it seems like thread does release lock when it enters to sleep mode when i uncomment the try-catch block.

import java.lang.*;
public class ThreadEx3 extends Thread {
    public synchronized void go() {
        for(int i=0;i<10;i++) {
            System.out.println(i + " " + Thread.currentThread().getName());
            //try {Thread.sleep(500);}
            //catch(Exception e) {}
        }
    }
    public void run() {
        go();
    }
    public static void main(String[] args) {
        ThreadEx3 t1 = new ThreadEx3();
        ThreadEx3 t2 = new ThreadEx3();
        t1.setName("t1");
        t2.setName("t2");
        t1.start();
        t2.start();
    }
}

[Henry Wong]

Suleyman Suleymanov wrote:hello.can anyone help me with this code? it seems like thread does release lock when it enters to sleep mode when i uncomment the try-catch block.

That's correct. The Thread.sleep() method doesn't release any locks. Were you under the impression that it does? Perhaps you are confusing the sleep() method with the wait() method?

Henry

[Suleyman Suleymanov]

when i uncomment the try-catch block i get this output :
0 t1
0 t2
1 t1
1 t2
2 t1
2 t2
3 t1
3 t2
4 t2
4 t1
5 t2
5 t1
6 t2
6 t1
7 t1
7 t2
8 t2
8 t1
9 t1
9 t2
doesn't it mean that t1 release lock when it goes to sleep and t2 get the lock?

[Henry Wong]

Suleyman Suleymanov wrote:when i uncomment the try-catch block i get this output :
0 t1
0 t2

doesn't it mean that t1 release lock when it goes to sleep and t2 get the lock?

Oh... I am sorry. I misread your question...

No. Thread.sleep() does *not* release any locks. The reason that the two threads are interlacing is because the two threads are using two different locks.

Henry

[Suleyman Suleymanov]

thanks.i got it.