python · vstinner · Jul 26, 2017 · Jul 26, 2017
diff --git a/Lib/multiprocessing/process.py b/Lib/multiprocessing/process.py
@@ -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):