2771   return backend;  in ev_backend()
2829   if (!backend)  in loop_init()
2874       backend            = 0;  in loop_init()
2895       if (!backend && (flags & EVBACKEND_IOCP  )) backend = iocp_init   (EV_A_ flags);  in loop_init()
2898       if (!backend && (flags & EVBACKEND_PORT  )) backend = port_init   (EV_A_ flags);  in loop_init()
2901       if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);  in loop_init()
2904       if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init  (EV_A_ flags);  in loop_init()
2907       if (!backend && (flags & EVBACKEND_POLL  )) backend = poll_init   (EV_A_ flags);  in loop_init()
2910       if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);  in loop_init()
2974   if (backend == EVBACKEND_IOCP  ) iocp_destroy   (EV_A);  in ev_loop_destroy()
2977   if (backend == EVBACKEND_PORT  ) port_destroy   (EV_A);  in ev_loop_destroy()
2980   if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);  in ev_loop_destroy()
2983   if (backend == EVBACKEND_EPOLL ) epoll_destroy  (EV_A);  in ev_loop_destroy()
2986   if (backend == EVBACKEND_POLL  ) poll_destroy   (EV_A);  in ev_loop_destroy()
2989   if (backend == EVBACKEND_SELECT) select_destroy (EV_A);  in ev_loop_destroy()
3021   backend = 0;  in ev_loop_destroy()
3041   if (backend == EVBACKEND_PORT  ) port_fork   (EV_A);  in loop_fork()
3044   if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);  in loop_fork()
3047   if (backend == EVBACKEND_EPOLL ) epoll_fork  (EV_A);  in loop_fork()
4740     assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));  in ev_embed_start()