[Python-ideas] Add a generic async IO poller/reactor to select module

[Ronald Oussoren]

On 24 May, 2012, at 14:03, Antoine Pitrou wrote:

> On Thu, 24 May 2012 13:50:27 +0200
> Giampaolo Rodolà <g.rodola at gmail.com>
> wrote:
>> 2012/5/24 Ronald Oussoren <ronaldoussoren at mac.com>:
>>> 
>>> On 24 May, 2012, at 3:32, Giampaolo Rodolà wrote:
>>>>>>> 
>>>> 
>>>> The handler is supposed to provide 3 methods:
>>>> - handle_read_event
>>>> - handle_write_event
>>>> - handle_error_event
>>>> 
>>>> Users willing to support multiple event loops such as wx, gtk etc can do:
>>>> 
>>>>>>> while 1:
>>>> ...       poller.poll(timeout=0.1, blocking=False)
>>>> ...       otherpoller.poll()
>>>> 
>>>> 
>>>> Basically, this would be the whole API.
>>> 
>>> Isn't this a limited version of asyncore? (poller.poll == asyncore.loop, the handler is a subset of asyncore.dispatcher).
>>> 
>>> Ronald
>> 
>> poller.poll serves the same purpose of asyncore.loop, yes, but this is
>> supposed to be independent from asyncore.
> 
> I agree with Ronald that it looks like a less-braindead version of
> asyncore. I don't think the select module is the right place.

What worries me most is that it might only look like a beter version of asyncore. I'd much rather see something based on the event-handling core of Twisted because that code base is used in production and is hence more likely to be correct w.r.t. odd real-world conditions.     IIRC doing this was discussed at the language summit in 2011, but as Nick mentions that doesn't seem to be the focus of PEP 3153.

I am by the way not using Twisted myself, I'm at this time still using homebrew select loops and asyncore.

> 
> Also, I don't know why you would specify poller.READ or poller.WRITE
> explicitly. Usually you are interested in all events, no?

You're not always interested in write events, those are only interesting when you have data that must be written to a socket.

Ronald

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