[Stackless] Tasklet cleanup?

[Gil Colgate]

I may be mistaken, but I believe the *kill* method is called on the tasklet
during garbage collection.
You can clean stuff up in that, but you are not allowed to raise any
uncaught exceptions.

On Sat, May 19, 2012 at 3:29 PM, Sylvain Prat <sylvain.prat at gmail.com>wrote:

> Hello,
>
> I'm wondering how tasklets can clean themselves up when they are
> destroyed due to garbage collection (i.e. when they are not in the
> runnables and not referenced by any object anymore). Greenlet solves
> this problem by raising a GreenletExit exception in the greenlet's run
> function when the greenlet is about to die due to garbage collection.
> However, in stackless, it seems that no TaskletExit exception is
> raised when the tasklet is about to die, so we can't simply use a
> try/finally in the tasklet's callable to clean up resources.
>
> I tried to wrap my tasklet in a parent object which has the same
> lifespan as my tasklet and has a __del__ function for cleaning up, but
> I keep having problems with circular references (the wrapper/parent
> object also provides the callable of the tasklet, i.e. a bound method)
> that make the tasklet/parent object uncollectable (circular references
> : wrapper --> tasklet --> stackless machinery? --> callable stack
> frame (bound method of wrapper) --> wrapper). Same problem when trying
> to inherit from tasklet.
>
> So, how can I clean up resources in tasklets? (I'm pretty sure I've
> missed something obvious)
>
> Thank in advance,
> Sylvain
>
> --
> Sylvain PRAT
>
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