public class MyThread : Object {

	public int lock_var = 0;

	public int increase_lock_var () {
		var ret = 0;
		lock (lock_var) ret = ++lock_var;
		return ret;
	}

	public int run () {

		for (var i = 0; i < 8; ++i) {
			var tmp = 0;
			lock (lock_var) tmp = lock_var++;
			stdout.puts (@"thrd:$lock_var\n");
			Thread.usleep(100);
		}
		return 0;
	}
}

void main () {
	var mt = new MyThread ();
	var t = new Thread<int> ("Debugging thread name", mt.run);

	for (var i = 0; i < 8; ++i) {
		var tmp = mt.increase_lock_var ();
		stdout.puts(@"main:$tmp\n");
		Thread.usleep(100);
	}

	t.join ();
}