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bpo-39244: multiprocessing return default start method first on macOS (GH-18625)

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idomic 2020-05-26 10:54:21 -04:00 committed by GitHub
parent 5eb45d7d4e
commit db098bc1f0
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3 changed files with 9 additions and 4 deletions
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7
Lib/multiprocessing/context.py
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@ -257,10 +257,11 @@ class DefaultContext(BaseContext):
if sys.platform == 'win32':
return ['spawn']
else:
methods = ['spawn', 'fork'] if sys.platform == 'darwin' else ['fork', 'spawn']
if reduction.HAVE_SEND_HANDLE:
return ['fork', 'spawn', 'forkserver']
else:
return ['fork', 'spawn']
methods.append('forkserver')
return methods
#
# Context types for fixed start method

4
Lib/test/_test_multiprocessing.py
View File

@ -5039,7 +5039,9 @@ class TestStartMethod(unittest.TestCase):
self.assertEqual(methods, ['spawn'])
else:
self.assertTrue(methods == ['fork', 'spawn'] or
methods == ['fork', 'spawn', 'forkserver'])
methods == ['spawn', 'fork'] or
methods == ['fork', 'spawn', 'forkserver'] or
methods == ['spawn', 'fork', 'forkserver'])
def test_preload_resources(self):
if multiprocessing.get_start_method() != 'forkserver':

2
Misc/NEWS.d/next/Library/2020-02-23-15-09-47.bpo-39244.aBK5IM.rst Normal file
View File

@ -0,0 +1,2 @@
Fixed :class:`multiprocessing.context.get_all_start_methods`
to properly return the default method first on macOS.