While there doesn't appear to be too much interest in this question I thought I would post the solution. I had to modify shoddy by adding the proper flags and clear/traverse methods such to ensure that cyclic garbage collection was properly handled. I'm not quite sure why I had to do this since my shoddy instance did not have any cyclic references but I'm wondering if it was necessary since it's a subclass of list which has all the cyclic GC machinery in place. I suspect I won't understand the answer but if someone with more knowledge can clear things up, that would great.
On Thursday, June 12, 2014 10:39:27 PM UTC-6, ptb wrote: > 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. -- https://mail.python.org/mailman/listinfo/python-list
