Hi, I'm a Google Summer of Code intern working on "Deferred Cancellation" project. I'm recently working on adding cancellation support to twisted.internet.task.LoopingCall.
However, after I added the canceller to LoopingCall.deferred, the twisted.test.test_application.TestInternet2.testPickledTimer failed due to a PicklingError. My branch is loopingcall-deferred-cancellation-6656. Here is the diff of my code: http://twistedmatrix.com/~diffresource.twistd/6656 Here is the error message: =============================================================================== [ERROR] Traceback (most recent call last): File "/home/kai/Projects/GSoC/DeferredCancellation/Twisted/branches/loopingcall-deferred-cancellation-6656/twisted/test/test_application.py", line 487, in testPickledTimer s = pickle.dumps(t0) File "/usr/lib/python2.7/pickle.py", line 1374, in dumps Pickler(file, protocol).dump(obj) File "/usr/lib/python2.7/pickle.py", line 224, in dump self.save(obj) File "/usr/lib/python2.7/pickle.py", line 286, in save f(self, obj) # Call unbound method with explicit self File "/usr/lib/python2.7/pickle.py", line 725, in save_inst save(stuff) File "/usr/lib/python2.7/pickle.py", line 286, in save f(self, obj) # Call unbound method with explicit self File "/usr/lib/python2.7/pickle.py", line 649, in save_dict self._batch_setitems(obj.iteritems()) File "/usr/lib/python2.7/pickle.py", line 663, in _batch_setitems save(v) File "/usr/lib/python2.7/pickle.py", line 286, in save f(self, obj) # Call unbound method with explicit self File "/usr/lib/python2.7/pickle.py", line 725, in save_inst save(stuff) File "/usr/lib/python2.7/pickle.py", line 286, in save f(self, obj) # Call unbound method with explicit self File "/usr/lib/python2.7/pickle.py", line 649, in save_dict self._batch_setitems(obj.iteritems()) File "/usr/lib/python2.7/pickle.py", line 663, in _batch_setitems save(v) File "/usr/lib/python2.7/pickle.py", line 331, in save self.save_reduce(obj=obj, *rv) File "/usr/lib/python2.7/pickle.py", line 401, in save_reduce save(args) File "/usr/lib/python2.7/pickle.py", line 286, in save f(self, obj) # Call unbound method with explicit self File "/usr/lib/python2.7/pickle.py", line 562, in save_tuple save(element) File "/usr/lib/python2.7/pickle.py", line 331, in save self.save_reduce(obj=obj, *rv) File "/usr/lib/python2.7/pickle.py", line 419, in save_reduce save(state) File "/usr/lib/python2.7/pickle.py", line 286, in save f(self, obj) # Call unbound method with explicit self File "/usr/lib/python2.7/pickle.py", line 649, in save_dict self._batch_setitems(obj.iteritems()) File "/usr/lib/python2.7/pickle.py", line 663, in _batch_setitems save(v) File "/usr/lib/python2.7/pickle.py", line 331, in save self.save_reduce(obj=obj, *rv) File "/usr/lib/python2.7/pickle.py", line 419, in save_reduce save(state) File "/usr/lib/python2.7/pickle.py", line 286, in save f(self, obj) # Call unbound method with explicit self File "/usr/lib/python2.7/pickle.py", line 649, in save_dict self._batch_setitems(obj.iteritems()) File "/usr/lib/python2.7/pickle.py", line 663, in _batch_setitems save(v) File "/usr/lib/python2.7/pickle.py", line 331, in save self.save_reduce(obj=obj, *rv) File "/usr/lib/python2.7/pickle.py", line 419, in save_reduce save(state) File "/usr/lib/python2.7/pickle.py", line 286, in save f(self, obj) # Call unbound method with explicit self File "/usr/lib/python2.7/pickle.py", line 649, in save_dict self._batch_setitems(obj.iteritems()) File "/usr/lib/python2.7/pickle.py", line 663, in _batch_setitems save(v) File "/usr/lib/python2.7/pickle.py", line 286, in save f(self, obj) # Call unbound method with explicit self File "/usr/lib/python2.7/pickle.py", line 748, in save_global (obj, module, name)) pickle.PicklingError: Can't pickle <function <lambda> at 0x8f1fb8c>: it's not found as twisted.internet.posixbase.<lambda> twisted.test.test_application.TestInternet2.testPickledTimer =============================================================================== I thought the reason was the circular references. However I searched about it and found that pickle could handle the circular reference cases. But the only significant change is that after I added the canceller, there is a circular reference between LoopingCall and LoopingCall.deferred. So I don't know what's the problem. How can I fix this? Thanks, -Kai
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