python - PyCurl。Windows x64 での「Curl オブジェクトをピクルできません」エラー

Question

import multiprocessing
import time
import pycurl

class Bot(multiprocessing.Process):
    def __init__(self):
        multiprocessing.Process.__init__(self)       
        self.c = pycurl.Curl() 

    def run(self):
        pass

if __name__ == '__main__': 
    Bot().start()    

このコードは Ubuntu 13.04 x64 では正常に動作しますが、Windows 7 x64/Server 2008 x64 では失敗します。私は pyCurl 7.19.0 と Python 2.7 を使用しています。エラーは次のとおりです。

Z:\bot>python test.py
Traceback (most recent call last):
  File "test.py", line 74, in <module>
    Bot().start()
  File "C:\Python27\lib\multiprocessing\process.py", line 104, in start
    self._popen = Popen(self)
  File "C:\Python27\lib\multiprocessing\forking.py", line 244, in __init__
    dump(process_obj, to_child, HIGHEST_PROTOCOL)
  File "C:\Python27\lib\multiprocessing\forking.py", line 167, in dump
    ForkingPickler(file, protocol).dump(obj)
  File "C:\Python27\lib\pickle.py", line 224, in dump
    self.save(obj)
  File "C:\Python27\lib\pickle.py", line 331, in save
    self.save_reduce(obj=obj, *rv)
  File "C:\Python27\lib\pickle.py", line 419, in save_reduce
    save(state)
  File "C:\Python27\lib\pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "C:\Python27\lib\pickle.py", line 649, in save_dict
    self._batch_setitems(obj.iteritems())
  File "C:\Python27\lib\pickle.py", line 681, in _batch_setitems
    save(v)
  File "C:\Python27\lib\pickle.py", line 313, in save
    (t.__name__, obj))
pickle.PicklingError: Can't pickle 'Curl' object: <pycurl.Curl object at 0x00000
00002360478>

Z:\bot>Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Python27\lib\multiprocessing\forking.py", line 347, in main
    self = load(from_parent)
  File "C:\Python27\lib\pickle.py", line 1378, in load
    return Unpickler(file).load()
  File "C:\Python27\lib\pickle.py", line 858, in load
    dispatch[key](self)
  File "C:\Python27\lib\pickle.py", line 880, in load_eof
    raise EOFError
EOFError

なぜこれが起こるのですか？