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

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Merged
markshannon 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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Make sure that tight loop interruption test terminates eventually.
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@markshannon
markshannon committed Jul 17, 2021
commit 413dffd117baee6fda798965cfdb23c4d37b14ad
28 changes: 17 additions & 11 deletions Lib/test/test_threading.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1606,22 +1606,28 @@ def test_interrupt_main_invalid_signal(self):

@threading_helper.reap_threads
def test_can_interrupt_tight_loops(self):
#Nothing to assert here. It just shouldn't hang.

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


class AtexitTests(unittest.TestCase):
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