TCMU and non-blocking FDs

[Oleg Smolsky <oleg@xxxxxxxxxxx>]

Hi there! I am reading tcmu-design.txt and have a question about 
"dev_fd" used for kernel-/user-mode notifications. Can I use it in a 
non-blocking way? Specifically, would it work if I do the following:
  1) fcntl(fd, ... | NONBLOCK);
  2) ev.events = EPOLLIN;
     epoll_ctl(..., EPOLL_CTL_ADD, fd, &ev);

If not, is there another way to achieve async notifications so that I 
don't waste a thread?

Thanks!
Oleg.
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