mmd_unlock();
// PARA_DEBUG_LOG("%s: select (max = %i)\n", __func__, max_fileno);
ret = select(max_fileno + 1, &rfds, &wfds, NULL, timeout);
mmd_unlock();
// PARA_DEBUG_LOG("%s: select (max = %i)\n", __func__, max_fileno);
ret = select(max_fileno + 1, &rfds, &wfds, NULL, timeout);