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bpo-40522: Store tstate in a Thread Local Storage #23976

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bpo-40522: Store tstate in a Thread Local Storage #23976

wants to merge 1 commit into from

Commits on Dec 28, 2020

  1. bpo-40522: Store tstate in a Thread Local Storage 

    If Python is built with GCC or clang, the current interpreter and the
current Python thread state are now stored in a Thread Local Storage.

Changes:

* configure checks for C11 _Thread_local keyword.
* Use _Thread_local keyword, GCC and clang __thread extension.
* Add set_current_tstate() sub-function which sets these two new TLS
  variables (if available).
* _PyThreadState_Swap() and _PyThreadState_DeleteCurrent() now call
  set_current_tstate().
* _PyThreadState_GET() and _PyInterpreterState_GET() now use the TLS
  variable if available.
    @vstinner
    vstinner committed Dec 28, 2020
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