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GH-83658: make multiprocessing.Pool raise an exception if maxtasksperchild is not None or a positive int (GH-93364)
Closes #83658.
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@ -203,6 +203,9 @@ def __init__(self, processes=None, initializer=None, initargs=(),
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processes = os.cpu_count() or 1
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if processes < 1:
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raise ValueError("Number of processes must be at least 1")
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if maxtasksperchild is not None:
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if not isinstance(maxtasksperchild, int) or maxtasksperchild <= 0:
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raise ValueError("maxtasksperchild must be a positive int or None")
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if initializer is not None and not callable(initializer):
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raise TypeError('initializer must be a callable')
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@ -2863,6 +2863,11 @@ def test_pool_worker_lifetime_early_close(self):
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for (j, res) in enumerate(results):
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self.assertEqual(res.get(), sqr(j))
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def test_pool_maxtasksperchild_invalid(self):
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for value in [0, -1, 0.5, "12"]:
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with self.assertRaises(ValueError):
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multiprocessing.Pool(3, maxtasksperchild=value)
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def test_worker_finalization_via_atexit_handler_of_multiprocessing(self):
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# tests cases against bpo-38744 and bpo-39360
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cmd = '''if 1:
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@ -0,0 +1 @@
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Make :class:`multiprocessing.Pool` raise an exception if ``maxtasksperchild`` is not ``None`` or a positive int.
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