Re: [uml-devel] Occasional hang starting up.

[Werner Almesberger <wa@almesberger.net>]

Blaisorblade wrote:
> 1) I'll try to fix poll(2) to return -EINVAL. Dunno whether anyone will say 
> "no, the app is stupid, it deserves no error", but hope not (with "try" I 
> refer to this). Attached patch should do this.

I think the behaviour of "poll" with nfds = 0 is correct as it is.
At least POSIX doesn't say anything to the extent that "nfds"
couldn't be zero:

http://www.opengroup.org/onlinepubs/009695399/functions/poll.html

Furthermore, this is one of several ways to implement a "sleep"
function with sub-second granularity, so existing applications
may already depend on "poll" accepting nfds = 0. (Of course,
they would probably be better off using "nanosleep".)

> 2) write_sigio_thread should do a "down" on a semaphore/mutex and the first 
> update_thread should "up" it.

Yup :-)

Thanks,
- Werner

-- 
  _________________________________________________________________________
 / Werner Almesberger, Buenos Aires, Argentina         wa@almesberger.net /
/_http://www.almesberger.net/____________________________________________/


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