54 lines
1.9 KiB
Python
54 lines
1.9 KiB
Python
import sys
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import joblib
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from joblib.testing import check_subprocess_call
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from joblib.test.common import with_multiprocessing
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def test_version():
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assert hasattr(joblib, '__version__'), (
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"There are no __version__ argument on the joblib module")
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@with_multiprocessing
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def test_no_start_method_side_effect_on_import():
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# check that importing joblib does not implicitly set the global
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# start_method for multiprocessing.
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code = """if True:
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import joblib
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import multiprocessing as mp
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# The following line would raise RuntimeError if the
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# start_method is already set.
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mp.set_start_method("loky")
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"""
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check_subprocess_call([sys.executable, '-c', code])
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@with_multiprocessing
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def test_no_semaphore_tracker_on_import():
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# check that importing joblib does not implicitly spawn a resource tracker
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# or a semaphore tracker
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code = """if True:
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import joblib
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from multiprocessing import semaphore_tracker
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# The following line would raise RuntimeError if the
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# start_method is already set.
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msg = "multiprocessing.semaphore_tracker has been spawned on import"
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assert semaphore_tracker._semaphore_tracker._fd is None, msg"""
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if sys.version_info >= (3, 8):
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# semaphore_tracker was renamed in Python 3.8:
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code = code.replace("semaphore_tracker", "resource_tracker")
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check_subprocess_call([sys.executable, '-c', code])
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@with_multiprocessing
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def test_no_resource_tracker_on_import():
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code = """if True:
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import joblib
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from joblib.externals.loky.backend import resource_tracker
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# The following line would raise RuntimeError if the
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# start_method is already set.
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msg = "loky.resource_tracker has been spawned on import"
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assert resource_tracker._resource_tracker._fd is None, msg
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"""
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check_subprocess_call([sys.executable, '-c', code])
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