[issue9786] Native TLS support for pthreads

[Kristján Valur Jónsson]

Kristján Valur Jónsson <kristjan at ccpgames.com> added the comment:

"errno" is preserved by PyEval_RestoreThread(), so this isn't the issue.
What you are probably seeing is latent race conditions in the test suite, made apparent by a non-locking TLS implementation.  The test suite isn't free from those, see for example issue 8799

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<http://bugs.python.org/issue9786>
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