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pip list --outdated fix #9048

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pip list --outdated fix #9048

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1 change: 1 addition & 0 deletions news/9047.bugfix.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Check for operativeness of multiprocessing. This takes care of systems where multiprocessing seems available but really is not.
9 changes: 8 additions & 1 deletion src/pip/_internal/utils/parallel.py
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Expand Up @@ -43,7 +43,14 @@
except ImportError:
LACK_SEM_OPEN = True
else:
LACK_SEM_OPEN = False
try:
p = ProcessPool()
p.terminate()
del p
except OSError:
LACK_SEM_OPEN = True
else:
LACK_SEM_OPEN = False

# Incredibly large timeout to work around bpo-8296 on Python 2.
TIMEOUT = 2000000
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