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gh-106236: Replace assert with raise RuntimeError in threading.py #106237

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Merged
merged 4 commits into from
Jul 12, 2023
Merged

gh-106236: Replace assert with raise RuntimeError in threading.py #106237

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gh-106236: Replace `assert` with `raise AssertionError` in `threading…
sobolevn Jun 29, 2023
861cb0e
Address review
sobolevn Jun 30, 2023
cff4214
Update Misc/NEWS.d/next/Library/2023-06-29-15-10-44.gh-issue-106236.E…
sobolevn Jun 30, 2023
1c79f57
Update Misc/NEWS.d/next/Library/2023-06-29-15-10-44.gh-issue-106236.E…
sobolevn Jun 30, 2023
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8 changes: 8 additions & 0 deletions Lib/test/test_threading.py
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Original file line number Diff line number Diff line change
Expand Up @@ -251,6 +251,14 @@ def f(mutex):
#Issue 29376
self.assertTrue(threading._active[tid].is_alive())
self.assertRegex(repr(threading._active[tid]), '_DummyThread')

# Issue gh-106236:
with self.assertRaises(RuntimeError):
threading._active[tid].join()
threading._active[tid]._started.clear()
with self.assertRaises(RuntimeError):
threading._active[tid].is_alive()

del threading._active[tid]

# PyThreadState_SetAsyncExc() is a CPython-only gimmick, not (currently)
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7 changes: 4 additions & 3 deletions Lib/threading.py
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Expand Up @@ -1451,11 +1451,12 @@ def _stop(self):
pass

def is_alive(self):
assert not self._is_stopped and self._started.is_set()
return True
if not self._is_stopped and self._started.is_set():
return True
raise RuntimeError("thread is not alive")

def join(self, timeout=None):
assert False, "cannot join a dummy thread"
raise RuntimeError("cannot join a dummy thread")


# Global API functions
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2023-06-29-15-10-44.gh-issue-106236.EAIX4l.rst
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@@ -0,0 +1,2 @@
Replace ``assert`` statements with ``raise RuntimeError`` in
:mod:`threading`, so that ``_DummyThread`` cannot be joined even with ``-OO``.