IO_RING_F_HAS_EVFD
ctx->int_flags |= IO_RING_F_HAS_EVFD;
ctx->int_flags &= ~IO_RING_F_HAS_EVFD;
if (ctx->int_flags & IO_RING_F_HAS_EVFD)
IO_RING_F_HAS_EVFD | IO_RING_F_POLL_ACTIVATED)
if (data_race(ctx->int_flags) & IO_RING_F_HAS_EVFD)