Recommended backend for Linux 5.11, and POSIX threads interop

[Amirouche]

Hello,


I am diving in to libev.

1) I want to understand what is the recommended backend; The pod 
document goes into a long description of how epoll is broken, but then 
it seems to me EPOLL is the recommended backend on Linux:

In ev.c here is the code that select the backend:

       if (!(flags & EVBACKEND_MASK))
         flags |= ev_recommended_backends ();

#if EV_USE_IOCP
       if (!backend && (flags & EVBACKEND_IOCP    )) backend = iocp_init  
     (EV_A_ flags);
#endif
#if EV_USE_PORT
       if (!backend && (flags & EVBACKEND_PORT    )) backend = port_init  
     (EV_A_ flags);
#endif
#if EV_USE_KQUEUE
       if (!backend && (flags & EVBACKEND_KQUEUE  )) backend = 
kqueue_init    (EV_A_ flags);
#endif
#if EV_USE_IOURING
       if (!backend && (flags & EVBACKEND_IOURING )) backend = 
iouring_init   (EV_A_ flags);
#endif
#if EV_USE_LINUXAIO
       if (!backend && (flags & EVBACKEND_LINUXAIO)) backend = 
linuxaio_init  (EV_A_ flags);
#endif
#if EV_USE_EPOLL
       if (!backend && (flags & EVBACKEND_EPOLL   )) backend = epoll_init 
     (EV_A_ flags);
#endif
#if EV_USE_POLL
       if (!backend && (flags & EVBACKEND_POLL    )) backend = poll_init  
     (EV_A_ flags);
#endif
#if EV_USE_SELECT
       if (!backend && (flags & EVBACKEND_SELECT  )) backend = 
select_init    (EV_A_ flags);
#endif

       ev_prepare_init (&pending_w, pendingcb);



2) In the THREAD LOCKING EXAMPLE, the code rely on a mutex and a 
condvar; Would it work better with CAS operation?


Best regards,

Amirouche