[issue23400] Inconsistent behaviour of multiprocessing.Queue() if sem_open is not implemented

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

But if this change is worth, I would write it as

-            maxsize = _multiprocessing.SemLock.SEM_VALUE_MAX
+            # Can raise ImportError (see issues #3770 and #23400)
+            from .synchronize import SEM_VALUE_MAX as maxsize

This would avoid a duplication of the error message.

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<http://bugs.python.org/issue23400>
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