I wonder if someone could provide a meaningful answer/pointer.

I want to implement my own version of _PyThread_CurrentFrames(), but it seems like it's not possible using public C-API. The comment in the source code of _PyThread_CurrentFrames() says that lists of interpreters and threads can be mutated even when GIL is held and so HEAD_LOCK() should be used. At the same time Advanced Debugger Support API exposes access to these lists but there is no way (or I don't see how) to achieve the same thing that HEAD_LOCK() does.

Am I missing something or Advanced Debugger Support is incomplete?

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With kind regards, Andrew Pashkin.
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