[issue30457] Allow retrieve the number of waiters pending for most of the asyncio lock primitives

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

> Not really, your code never removes the key from the events. If the cache is cleaned all further executions will keep forever in the `wait` statement. It is needed to create the Event again to perform at least one query to retrieve the cache value.

Right.  Well, that should be solved by adding "events.pop(key)" right after "events[key].set()"?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30457>
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