[issue17912] thread states should use a doubly-linked list

[Roundup Robot]

Roundup Robot added the comment:

New changeset 375d4fed4cf2 by Charles-Francois Natali in branch 'default':
Issue #17912: Use a doubly linked-list for thread states.
http://hg.python.org/cpython/rev/375d4fed4cf2

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nosy: +python-dev

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<http://bugs.python.org/issue17912>
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