How to start two threads at a time

Question

hi to all,
can any one tell me how we can start two or more threads at a time
this is my req in the application i want to check that
can any body help me in this regard.
ashok

Answer 1

If you are starting a whole bunch of threads, and want them to be eligable for execution at about the same time (i.e. dont get staggered due to the overhead of starting), then you can use locking / waiting.
I've not really had / wanted to do this before, but I suppose something like the following might work:
import EDU.oswego.cs.dl.util.concurrent.Latch;
import EDU.oswego.cs.dl.util.concurrent.Sync;
public class StartupTest {
  private void test() {
    Latch startGun = new Latch();
    // create and start some threads - I'll just create one
    Thread t = new Thread(new TestRunnable(startGun));
    t.start();
    // all started? Ok - fire the start gun to release them
    startGun.release();
  private class TestRunnable implements Runnable {
    private Sync startGun;
    TestRunnable(Sync startGun) {
      this.startGun = startGun;
    public void run() {
      waitForStart();
      // what ever you were going to do here......
    private void waitForStart() {
      try {
        startGun.acquire();
      } catch (InterruptedException e) {
        // what ever... I'll just bharf.
        throw new RuntimeException(e);
}Even with this, your threads aren't going to actually start working all at exactly the same time - but they'll all be eligable to start working at the same time.