EV_DEFAULT
# define EV_DEFAULT_ EV_DEFAULT, /* the default loop as first of multiple arguments */
EV_INLINE void ev_default_destroy (void) { ev_loop_destroy (EV_DEFAULT); }
EV_INLINE void ev_default_fork (void) { ev_loop_fork (EV_DEFAULT); }
if (ctx != EV_DEFAULT)
if (ctx != EV_DEFAULT)