Sagiv Malihi <[email protected]> added the comment:
OK, digging deeper reveals that there are actually two bugs here, one is
conceptual in the python importing mechanism, and the other is technical in
cPickle.
The first bug:
PyImport_ExecCodeModuleEx adds the module to sys.modules *before* actually
executing the code. This is a design flaw (can it really be changed? )
Demonstrating this bug is easy using the foo.py module from the previous
comment:
def f():
if 'bla' in sys.modules:
bla = sys.modules['bla']
else:
import bla
return bla.A()
running two instances of f in two threads results in the same error.
The second bug: in cPickle.c: func_class()
cPickle 'manually' checks if a module is in sys.modules instead of letting the
import mechanism do it for him (hence breaking the import lock's defense here).
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Python tracker <[email protected]>
<http://bugs.python.org/issue12680>
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