[Stackless] Weakref support for tasklets

[Christian Tismer]

Bob Ippolito wrote:

> I'm committing weakref support for tasklets, because I have a need for 
> it (giving each tasklet a separate stdin/stdout/stderr by using proxy 
> objects with __getattr__, since I can not give them separate sys 
> modules).  I'm not 100% of the ramifications of this, but it was about a 
> four line change and it doesn't seem to cause any problems (though it 
> does show how tasklets can be a little odd).

Ok, looking into lines 1220 to 1240 of typeobject.c (py2.2.3 still)
shows that a weak pointer costs exactly one word, like
the existence of a __dict__ does.
Not too bad, although, well it has to have a benefit.
I have been very tightfisted with tasklet memory, since
I want to have millions of them.
But I think your application makes sense.

> Additionally, would it be useful to put a weakref slot on channels?  I 
> don't need that at the moment, but it might be useful to someone?

No problem with channels, since I expect them to exist
10 times fewer than tasklets.

ciao - chris

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