GeezerVison

PyThreadState_SetProfile() is needed by the Python yappi profiler:

ts->c_profilefunc = _yapp_callback;

Source: https://github.com/sumerc/yappi/blob/8bf7a650066f104f59c3cae4a189ec15e7d51c8c/yappi/_yappi.c#L1258

See also discussion at: https://bugs.python.org/issue43760

cc @markshannon

I don't understand well the relationship between PyThreadState.c_tracefunc and PyFrameObject.f_trace. Currently, sys.settrace() function suggests setting frame.f_trace = tracefunc directly in Python: https://docs.python.org/dev/library/sys.html#sys.settrace

PyThreadState_SetProfile() is needed by the Python yappi profiler:

I'm not sure if yappi can use it directly, since PyThreadState_SetProfile() requires to hold the GIL. But it's more a yappi issue, than an API issue IMO.

This PR is stale because it has been open for 30 days with no activity.

I think it would be helpful to add a 3rd column stating which of the trace/profile functions see each event type. In case this isn't pointing to the right place, Doc/c-api/init.rst 1556 or 1616 depending on before/after

If you consider that the doc should be completed, please open a new issue. I don't see a direct relationship between your comment and my PR adding new functions.

I'm not convinced that there are 3rd party Python projects which need and will use this function. I prefer to close this PR for now. I may revisit it later, if more users of this function are discovered.