[Bf-python] Blender, Python, and Irix

[Willian Padovani Germano]

Hi Chris,

Chris Want wrote:

> A bit of hacking my python lib and using some printf's
> shows that there are probs during clean up when python
> is processing NMFaceType and SceneType (maybe stuff is
> getting free'd twice?). It looks like it finally croaks
> when it tries to clean up NMeshType.
>
> I don't know how to solve these problems.

Python can be compiled in debug mode and print ref counts all the time, 
but that isn't all that useful from what I remember.

There are some simple things we can test:

Does that crash on leaving Blender happens even if you don't use Python: 
no scriptlinks used in the loaded .blend file, no scripts executed at 
all?  Like using a "stock" .B.blend and just starting and quitting Blender?

If so, a possible test is commenting out / removing line 524 
(registration of Types module) in source/blender/python/api2_2x/Blender.c

And seeing if that makes any difference.

One thing I've seen causing crashes when leaving Blender (when switching 
from Py 2.2 to 2.3) was  Python itself, seemingly, having trouble with 
garbage collecting an error obj (lines 398 and 399 in 
source/blender/python/BPY_interface.c).  Adding a call to PyErr_Clear() 
there made things work fine, then.  You could try adding such a call 
before Py_Finalize(), for example in line 169 in this same file.

Another issue might be initialization of the types, we've had crashes in 
Mandrake related to that (and module types probably needs some updates 
to support newer objects).  Those crashes were caused on startup and the 
trouble seemed to be with this or that particular module, but it was not.

A problem with ref counting in NMesh or Scene themselves would probably 
cause crashes right after running scripts that used those modules, when 
their global dictionaries got freed.

It would be important to have a better idea about when these crashes 
started.  Would you say that they are not as old as the current bpython 
itself (Blender 2.28)?

-- 
Willian