C-API proper initialization and deallocation of subclasses
ptb
petertbrady at gmail.com
Fri Jun 13 00:39:27 EDT 2014
Hello all,
I decided to play around with the C-API and have gotten stuck. I went through the Shoddy example (https://docs.python.org/3/extending/newtypes.html#subclassing-other-types) in the docs and tried to extend it by adding a method which creates and returns a shoddy instance. I dug around to find ways to allocate and initialize my shoddy instance and that seems to work well. However, I get segfaults when I try to delete my instance. The code is in the gist: https://gist.github.com/pbrady/f2daf50761e458bbe44a
The magic happens in the make_a_shoddy function.
Here's a sample session (Python 3.4.1)
>>> from shoddy import make_a_shoddy()
>>> shd = make_a_shoddy()
tup build
shd allocated
list style allocation successful
Py_SIZE(list) : 5
Py_SIZE(shoddy) : 5
>>> type(shd)
<class 'shoddy.Shoddy'>
>>> shd[:]
[1, 2, 3, 4, 5]
>>> shd.increment()
1
>>> shd.increment()
2
>>> del shd
Segmentation fault (core dumped)
This happens even if I don't set the destructor. Any ideas on what I am doing wrong?
Thanks,
Peter.
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