[Patches] portable garbage collection for Python

[Christian Tismer]

Neil Schemenauer wrote:
> 
> I have a new version of my garbage collection patch available.
> If you have time please test it out and send me comments.  The
> patch against the current CVS version of Python is available
> from:
> 
>     http://www.enme.ucalgary.ca/~nascheme/python/gc-cycle.diff
> 
> I will give some more details on my approach tomorrow after I get
> some rest. :)

This looks really great!

One minor bug from just reading the diff:

***************
*** 215,220 ****
--- 219,227 ----
        PyListObject *op;
  {
        int i;
+ #ifdef WITH_CYCLE_GC
+       PyGC_Remove((PyObject *)op);
+ #endif
        Py_TRASHCAN_SAFE_BEGIN(op)
        if (op->ob_item != NULL) {
                /* Do it backwards, for Christian Tismer.
***************
*** 227,233 ****
                }
                free((ANY *)op->ob_item);
        }

Code must not be inserted before Py_TRASHCAN_SAFE_BEGIN,
this construct is supposed to enclose the whole destruction
process, whatever it is.

cheers - chris

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