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Amaury:
Your example succeeds on Linux but fails on Windows:
	$ python3.2 main.py
	CALLED
	Traceback (most recent call last):
	 File "C:\Python32\Lib\pickle.py", line 679, in save_global
		klass = getattr(mod, name)
	AttributeError: 'module' object has no attribute 'foo'
	During handling of the above exception, another exception occurred:
	Traceback (most recent call last):
	 File "main.py", line 7, in <module>
		p.start(); p.join()
	 File "C:\Python32\Lib\multiprocessing\process.py", line 130, in start
		self._popen = Popen(self)
	 File "C:\Python32\Lib\multiprocessing\forking.py", line 267, in __init__
		dump(process_obj, to_child, HIGHEST_PROTOCOL)
	 File "C:\Python32\Lib\multiprocessing\forking.py", line 190, in dump
		ForkingPickler(file, protocol).dump(obj)
	 File "C:\Python32\Lib\pickle.py", line 237, in dump
		self.save(obj)
	 File "C:\Python32\Lib\pickle.py", line 344, in save
		self.save_reduce(obj=obj, *rv)
	 File "C:\Python32\Lib\pickle.py", line 432, in save_reduce
		save(state)
	 File "C:\Python32\Lib\pickle.py", line 299, in save
		f(self, obj) # Call unbound method with explicit self
	 File "C:\Python32\Lib\pickle.py", line 623, in save_dict
		self._batch_setitems(obj.items())
	 File "C:\Python32\Lib\pickle.py", line 656, in _batch_setitems
		save(v)
	 File "C:\Python32\Lib\pickle.py", line 299, in save
		f(self, obj) # Call unbound method with explicit self
	 File "C:\Python32\Lib\pickle.py", line 683, in save_global
		(obj, module, name))
	_pickle.PicklingError: Can't pickle <function foo at 0x00C4EBB8>: it's not found as mod.foo
	User@TURING ~/Desktop/temp
	$ Traceback (most recent call last):
	 File "<string>", line 1, in <module>
	 File "C:\Python32\Lib\multiprocessing\forking.py", line 370, in main
		self = load(from_parent)
	EOFError