Notify another thread when ServerSocket blocks on accept()

Question

I've got a pair of threads running a Socket and ServerSocket:

runThreadA() {
     // Connects to B, or fails if B is not yet accepting
     socket.connect();
}

runThreadB() {
    // Blocks until another thread connects
    serverSocket.accept();
}

Is there a way I can guarantee that B calls accept() and blocks before A calls connect()?

Answer 1

Check CyclicBarrier and CountDownLatch which can help you make the threads to wait each other, they might be helpful.