"Barry A. Warsaw" wrote:
>
> >>>>> "CT" == Christian Tismer <tismer@tismer.com> writes:
>
> CT> You want most probably do this: __findattr__ should not be
> CT> invoked again for this instance, with this attribute name, for
> CT> this "thread", until you are done.
>
> First, I think the rule should be "__findattr__ should not be invoked
> again for this instance, in this thread, until you are done".
Maybe this is better. Surely easier. :)
[ThreadState solution - well fine so far]
> MZ> I don't think this is a good idea -- continuations and
> MZ> coroutines might mess it up.
>
> You might be right, but I'm not sure.
>
> If we make __findattr__ thread safe according to the definition above,
> and if uthread/coroutine/continuation safety can be accomplished by
> the __findattr__ programmer's discipline, then I think that is enough.
> IOW, if we can tell the __findattr__ author to not relinquish the
> uthread explicitly during the __findattr__ call, we're cool. Oh, and
> as long as we're not somehow substantially reducing the utility of
> __findattr__ by making that restriction.
>
> What I worry about is re-entrancy that isn't under the programmer's
> control, like the Real Thread-safety problem.
Hmm. WHat do you think about Moshe's idea to change compiling
of the method? It has the nice advantage that there are no
Thread-safety problems by design. The only drawback is that
the contract of not-calling-myself only holds for this function.
I don't know how Threadstate scale up when there are more things
like these invented. Well, for the moment, the simple solution
with Stackless would just be to let the interpreter recurse
in this call, the same as it happens during __init__ and
anything else that isn't easily turned into tail-recursion.
It just blocks :-)
ciao - chris
--
Christian Tismer :^) <mailto:tismer@tismer.com>
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