iunknwn <sz2...@gmail.com> added the comment:

I've submitted a PR that should resolve this - it uses a simple atomic counter 
to ensure new threads are not created if existing threads are idle. 

One concern I do have - while writing the patch, I noticed the existing submit 
method (specifically the adjust_thread_count function) isn't thread safe. I've 
added more details in the PR.

----------
components: +Library (Lib)

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue24882>
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