Uploaded Test files

venv/Lib/site-packages/joblib/_multiprocessing_helpers.py

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+"""Helper module to factorize the conditional multiprocessing import logic
+
+We use a distinct module to simplify import statements and avoid introducing
+circular dependencies (for instance for the assert_spawning name).
+"""
+import os
+import warnings
+
+
+# Obtain possible configuration from the environment, assuming 1 (on)
+# by default, upon 0 set to None. Should instructively fail if some non
+# 0/1 value is set.
+mp = int(os.environ.get('JOBLIB_MULTIPROCESSING', 1)) or None
+if mp:
+    try:
+        import multiprocessing as mp
+    except ImportError:
+        mp = None
+
+# 2nd stage: validate that locking is available on the system and
+#            issue a warning if not
+if mp is not None:
+    try:
+        # try to create a named semaphore using SemLock to make sure they are
+        # available on this platform. We use the low level object
+        # _multiprocessing.SemLock to avoid spawning a resource tracker on
+        # Unix system or changing the default backend.
+        import tempfile
+        from _multiprocessing import SemLock
+
+        _rand = tempfile._RandomNameSequence()
+        for i in range(100):
+            try:
+                name = '/joblib-{}-{}' .format(
+                    os.getpid(), next(_rand))
+                _sem = SemLock(0, 0, 1, name=name, unlink=True)
+                del _sem  # cleanup
+                break
+            except FileExistsError as e:  # pragma: no cover
+                if i >= 99:
+                    raise FileExistsError(
+                        'cannot find name for semaphore') from e
+    except (FileExistsError, AttributeError, ImportError, OSError) as e:
+        mp = None
+        warnings.warn('%s.  joblib will operate in serial mode' % (e,))
+
+
+# 3rd stage: backward compat for the assert_spawning helper
+if mp is not None:
+    from multiprocessing.context import assert_spawning
+else:
+    assert_spawning = None