[issue39609] Set the thread_name_prefix for asyncio's default executor ThreadPoolExecutor

[Markus Mohrhard]

Markus Mohrhard <markusm at dug.com> added the comment:

We have by now changed to a custom executor. Asyncio is used in some of our dependencies and therefore it took some work to figure out what is creating the thousands of threads that we were seeing.

This patch was part of the debuggin and we thought it would be useful for anyone else to immediately see what is creating the threads.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39609>
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