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test_asyncio: run_until() implements exponential sleep #93866

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vstinner merged 1 commit into from
Jun 15, 2022
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test_asyncio: run_until() implements exponential sleep #93866

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test_asyncio: run_until() implements exponential sleep 
run_until() of test.test_asyncio.utils now uses an exponential sleep
delay (max: 1 second), rather than a fixed delay of 1 ms. Similar
design than support.sleeping_retry() wait strategy that applies
exponential backoff.
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@vstinner
vstinner committed Jun 15, 2022
commit c5aae91934f2fff20abc274225a7e565ac15d669
4 changes: 3 additions & 1 deletion Lib/test/test_asyncio/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -109,10 +109,12 @@ async def once():


def run_until(loop, pred, timeout=support.SHORT_TIMEOUT):
delay = 0.001
for _ in support.busy_retry(timeout, error=False):
if pred():
break
loop.run_until_complete(tasks.sleep(0.001))
loop.run_until_complete(tasks.sleep(delay))
delay = max(delay * 2, 1.0)
else:
raise futures.TimeoutError()

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