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Issue #12285: multiprocessing.Pool() raises a ValueError if the number of

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processes if negative or null.
This commit is contained in:
Victor Stinner 2011-06-20 17:53:35 +02:00
parent 4707a998e4
commit 2fae27b735
2 changed files with 5 additions and 0 deletions
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2
Lib/multiprocessing/pool.py
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@ -148,6 +148,8 @@ class Pool(object):
processes = cpu_count() processes = cpu_count()
except NotImplementedError: except NotImplementedError:
processes = 1 processes = 1
if processes < 1:
raise ValueError("Number of processes must be at least 1")
if initializer is not None and not hasattr(initializer, '__call__'): if initializer is not None and not hasattr(initializer, '__call__'):
raise TypeError('initializer must be a callable') raise TypeError('initializer must be a callable')

3
Lib/test/test_multiprocessing.py
View file

@ -1089,6 +1089,9 @@ class _TestPool(BaseTestCase):
self.assertEqual(sorted(it), list(map(sqr, list(range(1000))))) self.assertEqual(sorted(it), list(map(sqr, list(range(1000)))))
def test_make_pool(self): def test_make_pool(self):
self.assertRaises(ValueError, multiprocessing.Pool, -1)
self.assertRaises(ValueError, multiprocessing.Pool, 0)
p = multiprocessing.Pool(3) p = multiprocessing.Pool(3)
self.assertEqual(3, len(p._pool)) self.assertEqual(3, len(p._pool))
p.close() p.close()