NPAPI race conditions due to IPC

Hi,

  I have a plugin which can create two types of scriptable objects and I can add one to another using JavaScript and id association in the plugin. I create one in HTML and the other one in JS. Example:

HTML:
  <embed id="a" type="application/x-a">

JS:
  b = document.createElement("embed");
  renderer.setAttribute("type", "application/x-b");

  a = documenet.getElementById("a");
  a.add(b);


  The problem which I am having is that NPN_Invoke for object a is called before NPP_New for object b. This is also visible in the invoke function because the _class member of the object which is given in the add function still has the default values.
  If I call a function of b than the NPP_New function is called before NPN_Invoke.
  The id association is done by trying to call a function of the object with NPN_Invoke:

C++:

  NPIdentifier identifier = NPN_GetStringIdentifier(GETID);
  if (!NPN_Invoke(npp, object, identifier, 0, 0, &variant)) {
    return 0;
  }
  obj = Manager.get(NPVARIANT_TO_INT32(variant);

  The problem disappears when dom.ipc.plugins.enabled is set to false.


  Could this be a problem caused by IPC? Is there a way to flush all the changes from javascript to the C++ code?

Thanks in advance,

Cosmin