[Python-3000] Non-blocking I/O? (Draft PEP for New IO system)

[Daniel Stutzbach]

On 3/7/07, Jim Jewett <jimjjewett at gmail.com> wrote:
> > The buffering layer could then raise IOError (or perhaps a special
> > subclass of it) if the raw I/O layer ever returned one of these;
>
> Is this a "could", or "should"?  I would expect the buffering layer
> (particularly output) to use its buffer, and to appear blocking
> (through sleep-and-retry) when that isn't enough.

If programmer has wrapped a non-blocking object with a buffer to give
it blocking behavior, I think this is a programming error and Python
should treat as such, not work around it so that the problem is harder
to detect.

An object only becomes non-blocking if the program explicitly makes it
non-blocking via fcntl.

-- 
Daniel Stutzbach, Ph.D.             President, Stutzbach Enterprises LLC