_rt_dprintf
_rt_dprintf("port_get on port %d failed with %d <%s>\n",
_rt_dprintf("port_get on port %d returned %u "
_rt_dprintf("port_get on port %d failed with %d <%s>\n",
_rt_dprintf("port_get on port %d returned %u "
_rt_dprintf("Cannot add work, error=%d <%s>.\n",
_rt_dprintf("del_sigev_timer(%d) OK.\n", timer);
_rt_dprintf("Fail to cancel %u with error %d <%s>.\n",