23 lines
642 B
Python
23 lines
642 B
Python
from weakref import ref
|
|
|
|
|
|
class GcWeakrefs(object):
|
|
def __init__(self, ffi):
|
|
self.ffi = ffi
|
|
self.data = {}
|
|
|
|
def build(self, cdata, destructor):
|
|
# make a new cdata of the same type as the original one
|
|
new_cdata = self.ffi.cast(self.ffi._backend.typeof(cdata), cdata)
|
|
#
|
|
def remove(key):
|
|
# careful, this function is not protected by any lock
|
|
old_key = self.data.pop(index)
|
|
assert old_key is key
|
|
destructor(cdata)
|
|
#
|
|
key = ref(new_cdata, remove)
|
|
index = object()
|
|
self.data[index] = key
|
|
return new_cdata
|