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bpo-44645: Check for interrupts on any potentially backwards edge #27216

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Merged
merged 3 commits into from
Jul 19, 2021
Merged

bpo-44645: Check for interrupts on any potentially backwards edge #27216

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7d1d912
Check for interrupts on any backwards edge.
markshannon Jul 15, 2021
e52abd2
Make sure test cleans up and doesn't race.
markshannon Jul 15, 2021
413dffd
Make sure that tight loop interruption test terminates eventually.
markshannon Jul 15, 2021
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25 changes: 25 additions & 0 deletions Lib/test/test_threading.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1604,6 +1604,31 @@ def test_interrupt_main_invalid_signal(self):
self.assertRaises(ValueError, _thread.interrupt_main, signal.NSIG)
self.assertRaises(ValueError, _thread.interrupt_main, 1000000)

@threading_helper.reap_threads
def test_can_interrupt_tight_loops(self):
cont = [True]
started = [False]
interrupted = [False]

def worker(started, cont, interrupted):
iterations = 100_000_000
started[0] = True
while cont[0]:
if iterations:
iterations -= 1
else:
return
pass
interrupted[0] = True

t = threading.Thread(target=worker,args=(started, cont, interrupted))
t.start()
while not started[0]:
pass
cont[0] = False
t.join()
self.assertTrue(interrupted[0])


class AtexitTests(unittest.TestCase):

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7 changes: 6 additions & 1 deletion Python/ceval.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3638,14 +3638,17 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, PyFrameObject *f, int throwflag)
if (Py_IsFalse(cond)) {
Py_DECREF(cond);
JUMPTO(oparg);
CHECK_EVAL_BREAKER();
DISPATCH();
}
err = PyObject_IsTrue(cond);
Py_DECREF(cond);
if (err > 0)
;
else if (err == 0)
else if (err == 0) {
JUMPTO(oparg);
CHECK_EVAL_BREAKER();
}
else
goto error;
DISPATCH();
Expand All @@ -3662,12 +3665,14 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, PyFrameObject *f, int throwflag)
if (Py_IsTrue(cond)) {
Py_DECREF(cond);
JUMPTO(oparg);
CHECK_EVAL_BREAKER();
DISPATCH();
}
err = PyObject_IsTrue(cond);
Py_DECREF(cond);
if (err > 0) {
JUMPTO(oparg);
CHECK_EVAL_BREAKER();
}
else if (err == 0)
;
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