bool
core_logic::is_player_there() const
{
  boost::scoped_lock<boost::mutex> lock(player_mtx_);
  return !ctx_.empty();
}



// This function blocks the thread...
void
core_logic::wait_for_players()
{
  boost::unique_lock<boost::mutex> lock(player_mtx_);

  is_betting_done_.wait(lock,
    boost::bind(&core_logic::is_player_there, this)
  );
}