/// <summary>
/// Blocking call that creates a new pump object and pumps
/// driver invokes until stopped via a PopInvoker call.
/// </summary>
public void PushInvoker()
{
InvokePump newPump = new InvokePump();
_invokePumpStack.Push(newPump);
// Blocking call while new driver invocations are handled on
// new pump.
newPump.Start();
}
