!7

sclass ProvokeDeadLock > DynPrintLog {
  transient Lock a = fairLock();
  transient Lock b = fairLock();

  JComponent visualize() {
    ret withCenteredButtons(super.visualize(),
      "Do the deadlock", rThread doIt);
  }
  
  void doIt {
    temp dm_tempDisableAllButtons();
    
    print("Initiating deadlock... :-)\n");
    
    Thread threadA = startThread("A", r {
      lock a; // cool new syntax!
      print("Thread A has lock A.");
      sleep1Second();
      print("Thread A getting lock B.");
      lock b;
      print("Thread A successful!");
    });
    
    Thread threadB = startThread("B", r {
      lock b;
      print("Thread B has lock B.");
      sleep1Second();
      print("Thread B getting lock A.");
      lock a;
      print("Thread B successful!");
    });
    
    joinThreads(threadA, threadB);
    setModuleName(print("Deadlock solved!"));
  }
}

Began life as a copy of #1009356