[Python-ideas] Async API: some code to review

Guido van Rossum guido at python.org
Mon Oct 29 17:35:16 CET 2012

On Mon, Oct 29, 2012 at 9:03 AM, Richard Oudkerk <shibturn at gmail.com> wrote:
> On 29/10/2012 2:47pm, Guido van Rossum wrote:
>> Kind of. I think if it was an important use case it might affect the
>> shape of the API. However I can't think of a use case where it might
>> make sense for two tasks to read or write the same file descriptor
>> without some higher-level mediation. (Even at a higher level I find it
>> hard to imagine, except for writing to a common log file -- but even
>> there you want to be sure that individual lines aren't spliced into
>> each other, and the semantics of send() don't prevent that.)
> It is a common pattern to have multiple threads/processes trying to accept
> connections on an single listening socket, so it would be unfortunate to
> disallow that.

Ah, but that will work -- each thread has its own pollster, event loop
and scheduler and collection of tasks. And listening on a socket is a
pretty special case anyway -- I imagine we'd build a special API just
for that purpose.

> Writing (short messages) to a pipe also has atomic
> guarantees that can make having multiple writers perfectly reasonable.

That's a good one. I'll keep that on the list of requirements.

--Guido van Rossum (python.org/~guido)

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