[issue39660] Contextvars: Optional callbacks on state change

[Yury Selivanov]

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

> Unfortunately, if Python is used as a frontend for a native libray (eg accessed via ctypes), and in case that the state of interest is managed in the native library, contextvar API is insufficient.

Please elaborate with a clearer example.

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<https://bugs.python.org/issue39660>
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