[issue34037] asyncio: BaseEventLoop.close() shutdowns the executor without waiting causing leak of dangling threads

[Yury Selivanov]

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

Here's the API I propose to solve this problem: https://github.com/python/cpython/pull/15735#pullrequestreview-285389412

Summary:

* Add a new loop.shutdown_threadpool() method. Just like with shutdown_asyncgens() -- it would be invalid to call loop.run_in_executer() after loop.shutdown_threadpool() is called.

* Make asyncio.run() to call the new loop.shutdown_threadpool().

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<https://bugs.python.org/issue34037>
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