2011/11/13 Matt Hagy <h...@gatech.edu>:
> Hi,
>
> Cython generators aren’t closed on dealloc and this can lead to cleanup code
> not being ran (see example below). I couldn’t find any reference to this
> issue on the trac or the wiki and therefore wanted to report it. If this is a
> know issue please disregard this post.
>
Good catch!
>
> I believe this can easily be corrected by adding the following line to the
> top of each generator dealloc function:
>
> if (p->resume_label != -1) __Pyx_Generator_Close(o);
>
I think that correct fix should be > 0 as we don't wanna close just
started generator
i
> This explicitly closes the generator unless it’s already finished. For
> testing I manually added this code to the generated C file and it worked as
> expected.
>
> -Matt
>
It's not that easy to fix. For convenience Closure sublasses generator type:
def foo(a):
try:
yield a
finally:
print 'cleanup'
print '"a" might be dead at this point', a
The problem is closure's __dealloc__ is called first then generator's.
So we can't call Geneator_Close() with deallocated closure.
I see few options here:
- do cleanup in closure type itsef
- make closure generator's attribute
I like the second case.
--
vitja.
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