Arcadiy Ivanov <[email protected]> added the comment:
@vstinner
> I'm not sure that I understand the bug.
The bug is, if a user makes an error and passes a Queue from context 'fork' to
a child that is spawned using 'spawn', the passed Queue is, for obvious
reasons, broken.
The 'print("Child r_q: %r, %r, %r" % (r_q._rlock, r_q._wlock, r_q._sem),
flush=True)' is simply a demonstration of a broken state of the SemLock
observed in the child.
The expected fix would be to stop the mixed context use of MP objects on the
API level (ValueError?) or at least prevent a segfault.
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<https://bugs.python.org/issue33196>
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