[Michael Hudson]
> ...
> One way of getting _Py_RefTotal out of sync is resurrecting objects in
> __del__ methods.
Oops! That's right:
"""
from sys import gettotalrefcount as g
class C:
def __del__(self):
alist.append(self)
alist = []
c1, c2, c3 = C(), C(), C()
del c1, c2, c3
while 1:
print g(), len(alist),
del alist[:]
"""
g() goes up by 3 each time around the loop.
/* If Py_REF_DEBUG, the original decref dropped _Py_RefTotal,
* but _Py_NewReference bumped it again, so that's a wash.
Heh. If you ignore the new reference(s) that resurrected the thing, I
suppose that would be true. It should (2.3.2) do
_Py_DEC_REFTOTAL;
to make up for the extra increment done by _Py_NewReference; likewise in
slot_tp_del (BTW, the macro expands to nothing if Py_REF_DEBUG isn't
defined).
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