[issue42969] pthread_exit & PyThread_exit_thread from PyEval_RestoreThread etc. are harmful

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

I'm not comfortable with PR 28525 which always hang threads which attempt to acquire the GIL after Python exited.

I would prefer to keep the current behavior by default, but give the ability to applications embedding Python to decide what to do.

With my Py_SetThreadExitCallback(func) idea, PyThread_exit_thread() would call func() and then pthread_exit(0). Applications can hang threads, log a message, call abort(), or whatever else.

I'm not comfortable with writing a portable function to "hang a thread". For example, I don't understand why PR 28525 processes Windows messages on hang threads.

Well, it's a complex problem :-(

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<https://bugs.python.org/issue42969>
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