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[2.7] bpo-31019: Fix multiprocessing.Process.is_alive() (#2875) #2882

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Merged
merged 1 commit into from
Jul 26, 2017
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[2.7] bpo-31019: Fix multiprocessing.Process.is_alive() (#2875) #2882

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10 changes: 8 additions & 2 deletions Lib/multiprocessing/process.py
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Original file line number Diff line number Diff line change
Expand Up @@ -156,10 +156,16 @@ def is_alive(self):
if self is _current_process:
return True
assert self._parent_pid == os.getpid(), 'can only test a child process'

if self._popen is None:
return False
self._popen.poll()
return self._popen.returncode is None

returncode = self._popen.poll()
if returncode is None:
return True
else:
_current_process._children.discard(self)
return False

@property
def name(self):
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