[issue17934] Add a frame method to clear expensive details

[Antoine Pitrou]

Antoine Pitrou added the comment:

Updated patch to avoid clearing executing frames.
Note that the new f_executing member should be re-usable to compute gi_running without storing it.

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Added file: http://bugs.python.org/file30225/frame_clear2.patch

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<http://bugs.python.org/issue17934>
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