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Added a comment about GIL acquisition vs. multithreading vs. program exit. #891

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Added a comment about GIL acquisition vs. multithreading vs. program exit. #891

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6 changes: 6 additions & 0 deletions docs/api_core.rst
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Expand Up @@ -2737,6 +2737,12 @@ running it in parallel from multiple Python threads.

Reacquire the GIL

If you use nanobind in a multi-threaded program, you **must** ensure that
all threads have terminated **before** the interpreter exits. Otherwise any
code that re-acquires the GIL (e.g. for running destructors) will throw a
cancellation exception. This will result in a hard crash because C++ does
not support exceptions in destructors, nor ignoring a cancellation.

Free-threading
--------------

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