Merge pull request #2895 from nouiz/cache

theano/gof/cmodule.py

@@ -960,6 +960,9 @@ class ModuleCache(object):
                 except cPickle.PicklingError:
                     key_data.remove_key(key)
                     key_broken = True
+                # We need the lock while we check in case of parallel
+                # process that could be changing the file at the same
+                # time.
                 if (key[0] and not key_broken and
                     self.check_for_broken_eq):
                     self.check_key(key, key_data.key_pkl)