[Pyrex] Tricky bug while unloading modules

[Robert Bradshaw]

Probably the easiest fix is to make the cleanup level (in Options.py)  
equal to 0. The cleanup function is still slightly experimental, and  
is primarily useful for improving the signal/noise ratio when using  
tools like valgrind to find memory leaks.

As all memory is returned when the process exits, so the cleanup code  
is not strictly necessary.

- Robert


On Nov 16, 2007, at 1:05 PM, Gustavo Sverzut Barbieri wrote:

> Hi,
>
> I'm mailing both Cython and Pyrex as we use Cython, but 99% sure that
> this problem also happens on Pyrex.
>
> In Python-EFL we have two modules that are related: evas and
> ecore.evas. The former is a canvas and its objects, the latter is the
> window that contains the canvas and its objects.
>     The window (ecore.evas) have a reference to the canvas (evas) that
> have reference to it's children. The C module will do the cascade
> delete when the root is deleted, with proper callbacks to inform
> object death.
>
> The problem happens when the window is not explicitly deleted by user
> and the program ends: the module will be unloaded before the objects
> are collected, but we have a call in the object dealloc that will use
> a method (from another object), that requires a module python-string
> to resolve the method. This string is NULL by that time, since
> cleanup() was run on module unloading, making our software exit with
> SEGV.
>
> To avoid the problem, we're forcing object's death with "del window",
> but it would be nice to have this object delete+unload done right,
> maybe force collection of module objects before unloading or something
> in these lines. I'm not sure what's the proper way to fix this.
>
> -- 
> Gustavo Sverzut Barbieri
> --------------------------------------
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>    MSN: barbieri at gmail.com
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>
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