private def invokeSynchronous(address, method, ...) {
  yield; // This is where it returns to runThreaded().
   // This is where we enter in runSynchronized();
  val result = native.invoke(address, method, ...);
  // See definition of invoke in initialize() for values of result.
  yield; // And return to runSynchronized();
  // And the next runThreaded() enters again.
  return result[1];
}
private def invokeDirect(address, method, ...) {
  val result = native.invoke(address, method, ...);
  // See definition of invoke in initialize() for values of result.
  if (result[0] == true) {
    return result[1];
  }
  else {
    return invokeSynchronous(address, method, ...);
  }
}
def invoke(address, method, ...) {
  if (isDirect(address, method)) {
    return invokeDirect(address, method, ...);
  }
  else {
    return invokeSynchronous(address, method, ...);
  }
}